The 2 complaints I hear most concerning the $330,000 Ford Mustang GTD are: 1. “That’s barely even a Mustang” and a pair of. “Why would you spend that a lot cash on a Mustang?” It appears the world has robust opinions on Ford’s 815 horsepower Nürburgring slayer however can’t determine if it’s too little Mustang or an excessive amount of. I had an opportunity to drive the automobile round a observe and discuss with engineers from Ford and the racecar engineering firm they developed the automobile with, Multimatic, to determine simply how a lot Mustang the GTD actually is. What I discovered could be very unusual, but in addition fascinating.
The Ford Mustang GTD is supposed to signify “the apex of Mustang efficiency.” That was Ford’s aim on day one — it wasn’t to construct the quickest automobile across the Nürburgring, it was to construct the quickest Mustang, utilizing learnings from the corporate’s GT3 automobile.
It’s vital to know this crystal clear aim, as a result of for those who don’t, then the GTD will look like a fully preposterous train, notably once you dig into the way it was constructed.
It Begins With A Common Ford Mustang Physique, Then Come The Plasma Cutters
The Ford Mustang GTD begins off as a typical black Ford Mustang physique that comes from the Flat Rock, Michigan meeting plant. This appears to be a shock to many, who suppose Multimatic — purveyors of the totally carbon fiber Ford GT — primarily constructed a carbon fiber physique from scratch and made it appear to be a Mustang. I’m not shocked folks suppose this, given statements like this from Ford:
“Mustang GTD shatters each preconceived notion of a supercar,” stated Farley, “It is a new strategy for us. We didn’t engineer a street automobile for the observe, we created a race automobile for the street. Mustang GTD takes racing expertise from our MustangGT3 race automobile, wraps it in a carbon fiber Mustang physique and unleashes it for the road.”
The reality is that the Ford Mustang GTD doesn’t actually have a “carbon fiber… physique,” per se. Most of its construction is metal and an identical to that of a run-of-the-mill $33,000 Ford Mustang EcoBoost. However that’s probably the most regular factor concerning the Mustang GTD, as a result of as quickly because the Mustang body-in-white (the essential physique construction) will get to Multimatic, out come the plasma cutters.
To fulfill Ford’s efficiency objectives, with the “North Star” being a sub-7 minute Nürburgring time, Multimatic (which is headquartered in Canada, however which additionally has a lot of engineering operations in Germany) and Ford had a bunch of levers they may pull — crank up energy, scale back weight, optimize aerodynamics, optimize suspension design, and many others. “You’ve bought this multivariate equation that you just’re all the time attempting to steadiness,” an engineer on the staff advised me, saying the Porsche 911 GT3 RS was the principle competitor, although that’s a smaller and lighter automobile with completely different constraints.
After I requested concerning the GTD’s engineering constraints related to attempting to be a Mustang, Ford unsurprisingly didn’t get an excessive amount of into it, although clearly measurement/weight are huge ones. Ford did inform me the whole level of GTD is to point out the aptitude of their pony — to attract a line between racing and street automobiles and above all: to raise the Mustang. Which means making a halo automobile, and it means giving Ford engineers expertise with tech that would trickle right down to different street automobiles. After I requested about an instance, GTD Program Supervisor Todd Valentine talked about that the GTD ditched the common Mustang’s MacPherson strut entrance suspension, and that “We now have a reference” for a multilink setup. Take that for what you’ll.
In an effort to accomplish this mission of constructing the final word Mustang that may lap the Nürburgring in underneath 7 minutes, Ford and Multimatic needed to crank up the observe width and set up completely monumental tires. The 345mm-wide Michelin Pilot Sport Cup 2Rs within the again appear to be rolling pins, and the 325s up entrance could actually be the widest manufacturing automobile tire ever, tied with the Lamborghini LM002, of which fewer than 350 have been ever made (Ford will probably promote over 1,000 GTDs over the following two years).
The grippy, broad tires are after all an enormous enabler for enhancing observe efficiency, although the observe width itself is large, too. A wider observe yields much less load switch, because the equation beneath reveals that the 2 are inversely proportional:
Load switch is vital as a result of, even for those who design a automobile that corners completely flat, loading up the within tires far more than the skin tires in a nook is an obstacle over attempting to cut back load switch and having all 4 tires extra evenly loaded. That is the case due to an idea referred to as Tire-Load Sensitivity, which I described in an previous Jalopnik article:
Lowering load switch can enhance general grip due to an idea referred to as tire load sensitivity. In essence, this time period describes the truth that the coefficient of friction between a rubber tire and pavement really decreases with load, or regular pressure, at a given slip angle—that is an inherent property of rubber.
A tire’s general grip doesn’t lower with vertical load—it nonetheless goes up—however the price at which grip will increase with vertical tire load drops attributable to that drop in friction coefficient, as is proven within the lowering slope of the extraordinarily simplified plot beneath (there’s the same plot on the web site Racing Automotive Dynamics).
I then give an instance of two (reasonably heavy) automobiles taking a nook, one with load switch and one with no load switch: Case 1 proven beneath sees 2000 kilos of load on every tire, whereas case 2 sees 3000 on the skin tire and 1000 on the within. Discover how having the even loading on the tires yields extra grip as a result of form of the tire-load sensitivity curve:
Racecar Dynamics breaks it down, saying:
From analysing [the plot above], it’s potential to get vital conclusions on the behaviour of a pair of tyres appearing parallel to one another, as within the entrance or rear axles. Below lateral accelerations, there might be a load switch on the axle from the within tyre to the skin one. The general vertical load on the axle will stay the identical, but the full lateral pressure generated by the axle might be smaller than if no lateral load switch had occurred.
Becoming that broad observe and people enormous tires within the small house between the usual Mustang’s physique construction and the outer sheetmetal wasn’t potential, so Multimatic put in new carbon fiber entrance fenders and, as an alternative of simply tacking on enormous fender flares within the again, it sliced off each rear quarter panels with a plasma cutters, changing them with large carbon fiber quarterpanels that “shingle” over high of the prevailing metal. Right here’s the seam within the door jamb:
And right here you’ll be able to see the seam between the brand new carbon fiber quarter panels and the physique construction beneath the place the trunk lid on a non-GTD Mustang would usually be (the GTD will get a “tech panel” as an alternative of a trunk lid):
The prettiest seam is after all the Class-A floor that one can see from the skin — the roof seam:
Along with the rear quarter panels, the usual Mustang’s body-in-white additionally had its trunk flooring plasma-cut out to accommodate the Ford Mustang GTD’s eight-speed dual-clutch transaxle (which we’ll have a look at in a second) and the automobile’s all-new rear pushrod suspension.
The Pushrod Rear Suspension
The Ford Mustang GTD’s pièce de résistance is its pushrod rear suspension. That’s what the motive force sees within the rearview mirror behind a window that replaces the seat that might be in the usual Mustang. Right here’s that window:
The pushrod suspension — as fancy because it seems to be — was pushed largely by a quite simple idea: Get extra rubber on the bottom for higher grip. To that finish, to be able to package deal the GTD’s 345 millimeter broad rubber rolling pins, not solely did the physique need to get wider, however the springs and dampers needed to transfer. They may not be upright, appearing on the physique construction.
Right here you’ll be able to see a typical Mustang S550 rear suspension; you’ll see that the shocks mount to the suspension’s decrease management arms on the backside and to the physique up above by way of two bolts; the springs, too, mount to the decrease management arms down beneath and push up in opposition to spring perches on the physique.
The Mustang GTD makes use of the identical subframe mounting factors as a base Mustang (you’ll be able to see the 4 bushings within the picture above), although apart from that, the suspension is totally completely different. As an alternative of getting separate springs and dampers, and even upright coilovers, the GTD makes use of a pushrod-activated inboard coilover design that options Multimatic’s “Adaptive Spool Valve” damping with twin springs.
Every rear wheel will get two springs (technically there’s a small third spring to maintain all the pieces tight, however that doesn’t matter for this dialogue) in sequence. One of many springs is stiff, whereas the opposite is tender, yielding an general spring price that’s really decrease than both. Put the automobile into observe mode, although, and an electrohydraulic valve sends fluid into the gold a part of the dampers proven beneath in such a manner that it causes the portion of the damper that might usually telescope with the movement of the tender spring to “backside out.” With that tender spring locked, the stiff spring is doing all of the work, yielding a firmer experience and an general automobile experience peak that has dropped 40 mm.
Right here you’ll be able to see how these Adaptive Spool Valves perform:
It’s a captivating, and but remarkably easy system — and a good looking one. Lots of the parts that the springs/dampers fasten to are manufactured from billet aluminum, and even the tiny sway bar — skinny, however stiff attributable to its brief size — seems to be good.
Discover how that pushrod that connects the gorgeous decrease management arm to the bellcrank (which attaches to the ASV damper, yielding a 1:1 movement ratio between the wheel’s vertical displacement and the damper displacement) is so skinny. This, and notably not needing to attempt to package deal these huge fancy springs/dampers upright utilizing the manufacturing facility physique spring/damper provisions, means there’s a great deal of room for these gigantic, grippy 345-section tires.
Above, you’ll be able to see the camber hyperlink up high, the toe hyperlink beneath, the decrease management arm as effectively, which is related to the knuckle by way of an “integral hyperlink.”
You possibly can learn all concerning the integral hyperlink in our story “Why Automakers Nonetheless Worship This 30-12 months-Outdated BMW’s Suspension,” because the E39 5 Collection is the automobile that pioneered the design, however I had Multimatic’s Technical Director of Automobile Improvement, Murray White, readily available, and he broke it down for me.
He stated an integral hyperlink is what constrains the wheel’s caster — in different phrases, it’s what prevents the whole knuckle from rotating in direction of the entrance or rear of the automobile, particularly underneath braking. The 2 bushings in that integral hyperlink may be tuned in order that they supply some quantity of compliance, which means for those who hit a bump, these bushings will “give” slightly. Sometimes, on a automobile with out an integral hyperlink (like a primary double wishbone), it’s the bushings on the subframe facet of every management arm that must supply that compliance to yield a pleasant experience. On the GTD, the subframe bushings may be stiff as a rock for the reason that integral hyperlink is offering that compliance within the caster path.
“Permitting the longitudinal …compliance to return from caster rotation reasonably than permitting the whole suspension to maneuver again on the bushings, means you’ll be able to run extraordinarily stiff bushings within the lateral hyperlinks, so that you get very excessive lateral stiffness, nonetheless with some recessional compliance, so it’s a greater compromise between experience and dealing with,” White advised me.
The Multilink (Quick Lengthy Arm) Entrance Suspension Is Additionally Extraordinarily Wacky
The Ford Mustang GTD’s rear suspension will get all of the love, and you may perceive why; it’s stunning. The billet aluminum, the beautiful bellcrank (or “rocker”), the slender pushrod — it’s a murals. Add to that the truth that Ford actually plasma-cut off the rear quarter panels and the trunk flooring to suit it, and also you’ve positively bought the automobile’s centerpiece. However the GTD’s entrance suspension deserves a bit of affection, too, as a result of it’s a serious departure over the usual Mustang’s entrance MacPherson Strut setup, and thus required fairly a little bit of adaptation to the Mustang’s body-in-white.
Let’s begin by exhibiting the usual Mustang’s entrance suspension:
It’s a reasonably easy MacPherson strut design, with the lateral hyperlink and stress hyperlink primarily making a decrease wishbone, and with the strut itself constraining the knuckle’s caster and camber (i.e. ensuring the wheel doesn’t tip in direction of/away from the automobile, and that it doesn’t rotate backwards/forwards in direction of/away from the entrance of the automobile). As talked about in Huibert’s “How Suspensions Work” piece, you’ll be able to consider the strut as a inflexible pole that rotates about its personal axis (to steer) and that telescopes when hitting bumps.
In fact, the strut isn’t actually inflexible, and can flex a bit, which is likely one of the many causes the GTD went away from it and in direction of a multilink design that gives higher wheel place management and improved tune-ability. From Ford:
Engineered particularly for the Mustang GTD, the distinctive multi-link suspension structure replaces the usual MacPherson strut setup, minimizing friction and enhancing lateral stiffness and elasto-kinematics, particularly in high-G cornering, leading to extra predictability and confidence in entrance finish grip.
However this redesign wasn’t trivial, as there have been no mounts on the Mustang’s body-in-white for an higher management arm. Ford’s resolution? They only bolted some onto the Mustang’s entrance crash rails within the type of an enormous forged aluminum plate.
Sure, actually bolted:
Right here’s one other angle; you’ll be able to see on the left facet two bolts that thread by means of the aluminum plate, by means of the pinch flange within the crash rail, and right into a pair of nuts on the again facet:
Apparently, and sure for packaging causes to clear these huge 325s up entrance, the strut meeting doesn’t have its axis aligned with the strut tower.
(The entrance strut meeting, just like the rear, options two springs in sequence, with the softer decrease spring capable of be hydraulically locked out for observe mode. This lowers the experience peak and stiffens the experience, although the entrance strut meeting may go the opposite path, providing carry for pace bumps — the hydraulic strains within the backside of the picture above reveals one thing that appears completely different than the rear damper meeting, largely as a result of the entrance has a rubber bellow over the tender spring as a result of the entrance suspension isn’t sealed off from the setting just like the rear is ).
Right here you’ll be able to have a look at the manufacturing facility Mustang underhood strut tower, and you may see there’s not an entire lot happening there:
That’s as a result of the higher mount is definitely offset from the axis of the damper meeting:
Wanting from the underside, you’ll be able to see that both Ford painted the highest a part of the strut-assembly mount black, or there’s a black cowl the place it meets the strut tower outboard of the highest of the strut meeting:
Right here’s have a look at the higher damper-assembly mount, which you’ll see displaces the highest of the damper meeting inboard, and which you’ll see is tied into the higher management arm mounting plate on the crash rail by way of a shiny vertically-oriented aluminum plate:
Discover that entrance subframe above; regardless that the Mustang GTD has a multilink entrance suspension and never a MacPherson strut like the usual Mustang does, the automobiles share a entrance Ok-member (subframe/cradle), although Murray White from Multimatic did level out that the GTD’s decrease management arm mounts to it not by way of bushings like the usual automobile, however by way of cross-axis ball joints, which he says present extra lateral stiffness than bushings. Right here’s my finest try at a shot of a cross-axis balljoint (riveting, I do know):
Earlier than I transfer on, I simply wish to be aware that, like the usual automobile, the Mustang GTD additionally incorporates a double ball joint entrance suspension design — one thing has grow to be more and more widespread due to its quite a few benefits (like brake packaging); Huibert breaks all of it down right here in his article; right here’s a have a look at the 2 ball joints that create the “digital ball joint” round which the wheel steers.
The Drivetrain
Let’s get into the drivetrain; to try this, we should always bounce again to that rear suspension, as a result of that shares the subframe with the eight-speed twin clutch transaxle. Right here you’ll be able to see staff mounting this transaxle to the rear suspension subframe:
And right here it’s all mounted up with the suspension.
The way in which this all will get mounted to the automobile is, the transaxle on the rear subframe will get bolted to a carbon fiber driveshaft (this isn’t a GTD unique, however you’ll be able to think about how briskly that factor rotates given it’s pre-transmission and doesn’t get the gear discount on a automobile with a 7000+ RPM redline), which itself is bolted to a Rear Engine Mounting System (REMS), which bolts to the 815 horsepower 5.2-liter supercharged V8:
Right here you’ll be able to see a technician putting in the REMS, which incorporates a shaft that goes into… I’m not fully positive. Is {that a} dry sump reservoir underneath an adapter? I don’t know:
The engine comes sitting on the entrance subframe, which — once more — is widespread with a daily Mustang. And, with the entrance higher management arms and entrance strut assemblies mounted to the physique, the GTD physique (which had all the pieces from its A-pill ahead masked off so it stays black for aesthetic causes) will get lowered onto the entrance and rear subframes, that are then fixed by way of just some large bolts:
Right here’s a have a look at how that rear subframe seems to be from beneath; the tubular design is attention-grabbing:
The pushrod suspension will get mounted to the highest of that subframe, but it surely goes into the automobile after the physique has been dropped onto that subframe. Within the photograph beneath, you’ll see a brand new acoustic aluminum (two layers of aluminum with some insulator between them) flooring to cowl the opening Multimatic plasma-cut into the Mustang’s trunk; simply beneath the brand new flooring is the transaxle, and as you see above, the pushrod suspension is mounted by means of the brand new flooring to the subframe beneath:
Just a little bit concerning the transaxle: The TR-9080 dual-clutch transaxle (which is identical mannequin discovered within the Corvette Stingray) within the rear helps the Mustang GTD obtain an almost 50:50 weight distribution. It snaps off shifts in a tenth of a second, and as a Tremec engineer advised me, it doesn’t pull torque between gears, with the transmission utilizing a hydraulic pump to “pace down” the engine, which really yields an over-boost perform after the shift (this perform isn’t in all drive modes, as you could possibly think about not wanting such a lift whereas driving round). I can’t say I totally understood all of the geekery the Tremec enginerd was imparting on me, however as I’ll describe in my driving impressions, the proof is within the pudding.
Let’s get again to this engine, however solely briefly. It’s a 5.2-liter supercharged, forged aluminum, dry sump-equipped V8 that Ford calls a “modified Predator.” It’s bought a 9.5:1 compression ratio, 4 valves per cylinder, and an output of 815 horsepower at 7,400 RPM and 664 lb-ft of torque at 4,800 RPM. Listed here are just a few photographs of its glory:
That engine, as you think about, wants fairly a little bit of cooling, and the 4,400-pound automobile, as you additionally may think, wants fairly a little bit of downforce to get round a observe rapidly.
Aerodynamics And Cooling
For me to completely cowl the Ford Mustang GTD’s aerodynamic options would require me to return in time and double main in Aerospace engineering as an alternative of minoring in it, and even then, this text could be so lengthy it’d take you all weeks to learn.
Nonetheless, there’s manner an excessive amount of good things to disregard. Try that carbon fiber wing; it’s bolted to the hydroformed roof construction underneath the GTD’s carbon fiber rear quarter panels.
I really managed to dig by means of some Ford footage to search out slightly little bit of video footage exhibiting the actuators within the wing; right here’s a screenshot:
It is a hydraulically actuated rear wing that flips as much as maximize downforce and down to maximise straight-line pace. The wing’s hydraulic system is immediately coupled to entrance air deflectors which might be actually laborious to see. Fortunately, Ford put a GTD up on a hoist only for me!
With the automobile on the hoist, you could possibly see the DRS (Drag Discount System) Flaps just below the automobile’s chin, actually properly built-in into the underbody defend. “So that is the place it will get a number of its entrance downforce from,” Murray White from Multimatic advised me. “When that is closed, the rear wing flap is all the time closed. So you bought most downforce on the again…[and] entrance.”
“Every time the rear wing flap is open in [Drag Reduction] mode, these flaps deploy into the airstream and stall the circulation underneath the splitter, so it’s not creating as a lot entrance downforce to steadiness to steadiness out the rear downforce, which has dropped when it’s gone into DRS.”
It’s maybe not intuitive, as deploying the flap really decreases drag as a result of it stalls airflow by means of elements of the entrance finish that might in any other case flip that airflow into downforce and thus drag. Ford breaks it down:
The entrance underbody is formed like a keel that helps evacuate incoming air by means of the entrance wheel wells and enormous fender louvers to create an space of decrease stress that acts like suction to assist preserve the entrance finish steady by means of turns.
“We actively handle the place the middle of air stress is on the automobile, so the entrance and rear can stay balanced,” stated Goodall. “The flexibility to do that isn’t allowed in racing, the place the foundations don’t permit actively managing airflow.”
The flaps work along with the rear wing, sharing a hydraulic system in order that if one in all them fails, they each go into most downforce (and thus drag) mode for security. Right here you’ll be able to see the automobile in Low Downforce Mode, with the wing open and the flap down:
And right here’s excessive downforce:
The circulation within the excessive downforce mode seems extra laminar up entrance (since it may well feed the underbody downforce-enablers) however extra turbulent out again on the wing. Right here it’s from the facet going from low downforce:
To excessive downforce (see beneath); once more, in low downforce mode, these entrance flaps are tripping up that air fairly a bit as you’ll be able to see above.
Right here’s one other angle going from high speed-mode to stick-to-the-road mode:
Right here’s a distinct angle: Low downforce:
Excessive downforce:
Low downforce:
Excessive downforce:
Low downforce:
Excessive downforce:
You get the concept.
To complete off dialogue concerning the hydraulic wing and flap, I’d like to point out you Ford’s nice photos of the complete hydraulic system, which hyperlinks the 4 dampers/springs with the DRS flap and wing:
In fact, there’s a lot extra to the Mustang GTD’s aero than simply the Drag Discount System. Simply have a look at this face:
The primary cooling module out entrance consists of a typical radiator and an AC condenser, each sandwiching a low temperature radiator meant to chill the engine’s gigantic 2.65-liter Eaton supercharger. The outboard warmth exchangers are an auxiliary radiator on the passenger’s facet and an oil cooler on the motive force’s facet. Different inlets on the entrance embody engine consumption ducts and brake ducts, the latter of which I snagged just a few photographs of, as a result of who doesn’t wish to see the within of some brake cooling ducts?
Observe the intelligent plastic air deflectors sending air in direction of the brakes:
And listed below are the outboard warmth exchangers up shut exchanger, beginning with the oil cooler:
Right here’s the auxiliary high-temp radiator (engine radiator):
On the again facet, listed below are the brake duct and outboard warmth exchanger retailers within the fender wells — once more, try the air deflectors:
It’s additionally value wanting on the twin air intakes on the entrance of the automobile — intakes that Ford says have been required to maximise energy from the engine by decreasing the consumption system stress drop. Right here’s the principle consumption:
And up above you’ll be able to see the secondary one:
One other notable aero/thermal factor is the hood air extractors.
A part of me was slightly upset Ford didn’t go together with a ducted cooling module — the holy grail of cooling options as a result of ducting air out by means of the hood permits for many airflow by means of the cooling module with out all of the “cooling drag” (and potential front-end carry) related to air flowing right into a reasonably un-aerodynamic engine bay.
The GTD’s mesh extractors above, although, are simply extractors — they principally permit air from the high-pressure engine bay to circulation out by means of the hood. The air popping out of the again of the warmth exchangers isn’t precisely ducted cleanly — it simply pressurizes the engine bay, and the distinction in stress between the pressurized engine bay and the low stress, high-flow air above means air leaves by means of these extractors, decreasing underhood warmth and selling cooling module airflow.
Todd Valentine made it clear {that a} ducted cooling module like these in a Mustang GT3 automobile would have been a serious packaging nightmare, to not point out it could have required a serious tear-up to the entrance of the automobile (the GOR, Grille Opening Reinforcement), which has crash/different regulatory implications.
Todd additionally confirmed me the entrance fender vents which assist with air extraction and thus scale back carry, and he confirmed me the facet vent, which he claims helps vent the cabin by way of the cabin exhausters (one other rep advised me they’re simply aesthetics):
Todd additionally identified that, although GTD homeowners should not more likely to commonly drive in downpours, the engine is designed to deal with water coming by means of the hood’s extractor mesh. That fuse field on the left, and people two SMOG pumps mounted to the radiator assist, each characteristic covers to guard them in opposition to the weather (see photograph two above). Todd additionally identified the little flicks on the hood air extractors, saying they shift the middle of stress ahead, and that their addition was a results of Nürburgring driver suggestions, with the consequence being a entrance finish with a bit extra really feel.
So lots of the aerodynamic enablers are interconnected; the automobile has to work as a system. Issues like these hood flicks above, the roof, even the mirrors, might have an effect on the rear wing’s capacity to create the downforce wanted to slay the Nürnburgring. The interconnectedness of all of it is clear once you look underneath the GTD, too. There, you’ll discover Tire Wake Deflectors.
“They’re a part of the underbody downforce package deal, so it deflects the air, impacts the airflow across the automobile and beneath the automobile to enhance the downforce, notably in entrance of the automobile,” Murray advised me:
Forward of these Tire Wake Deflectors you’ll see some ducts for exhaust cooling. With that huge flat carbon fiber/aluminum stomach pan spanning the whole size of the automobile, the warmth of that exhaust will get trapped, therefore the necessity for these ducts and openings:
Aerodynamics is a balancing act, whereby it’s a must to think about the airflow wants of assorted parts — varied cooling modules, the exhaust system, the brakes, and on and on. We’ve already had a have a look at the entrance brake ducts; right here’s the rear. It’s an enormous plastic channel with a grate out entrance to maintain stones out, and it Y’s off to ship air to each the pads/caliper above and backside of the brake rotor:
Whereas I’m on this space, I’d wish to level out that the flamboyant pushrod suspension’s pushrods that we noticed all shiny earlier are in actuality protected by a rubber bellow in order that they don’t introduce dust into the rear spring/damper space that you just see by means of the clear window within the automobile:
The truth is, let’s have a deeper have a look at that space behind the rear suspension window.
The Tech Panel
One in every of my favourite elements of the GTD is the “tech panel,” largely as a result of I just like the identify. It’s what replaces the usual automobile’s trunk lid, and is fixed to the automobile by way of some hood pins and one latch on the rear; the tech panel options a gap at its entrance to permit air to feed the transaxle cooler within the again. 
This implies the cooler is sort of near what it’s cooling, which is an effective factor for effectiveness and weight-savings:
Anyway, right here you’ll be able to see the tech panel:
And here’s a GTD with that eliminated:
That duct underneath the tech panel sends air by means of the transmission cooler, out the again of the automobile; you’ll be able to see the twin followers behind the warmth exchanger once you have a look at the rear of a GTD:
Let’s try what’s underneath that tech panel — this space will not be meant for storage, however there is house:
Right here, let’s hit the sunshine change:
You possibly can see that dual-layer aluminum flooring that’s been glued into the large gap Multimatic lower with a plasma cutter to suit the transaxle beneath, and on high of that new flooring, bolted into the subframe beneath, is the beautiful suspension that you just see from the window contained in the automobile. On the left facet of the picture above you’ll be able to see the reservoir for the hydraulic system that feeds the suspension, rear wing, and entrance DRS flaps; that reservoir is packaged alongside the pump itself.
Above the spring/damper meeting, you’ll be able to see some subwoofers constructed right into a particular carbon fiber cowl that homes the see-through panel and that takes the place of a seatback on the non-GTD Mustang.
On the passenger’s facet of this house underneath the tech panel is the battery, and between it and the hydraulic pump, on that new aluminum flooring, you’ll be able to see hydraulic hoses going by means of a rubber grommet.
It’s all a bit… untidy. However that’s why I began this text by saying the engineering of this automobile is a bit unusual; “It was barely uncommon; we’ve executed modifications to current body-in-whites earlier than, however I’d say that is probably the most excessive,” Murray White from Multimatic advised me. And certainly. Hacking off quarter panels and a trunk flooring with a plasma cutter, gluing in a brand new flooring, and bolting on entrance suspension mounts to a crash rail does appear “excessive,” if a bit inelegant.
However What Is It Like To Drive?
My first drive within the Ford Mustang GTD was on an autocross observe, and it was there that I skilled launch management, and the distinction between Regular Mode and Observe Mode. In observe mode, which is activated when the automobile is in park, the suspension drops about 40mm, and all the pieces corporations up. As Murray advised me, the springs need to be reasonably stiff in order that they don’t backside out when hitting a small bump whereas the automobile is making its super downforce (1355 kilos at 150 mph), and certainly, they completely change the demeanor of the automobile.
In regular mode, the automobile feels sharp sufficient, however in Observe Mode, it feels glued to the bottom. I didn’t spend a ton of time autocrossing the GTD; all I might collect was that the steering felt effectively assisted, although getting the large automobile by means of these cones did require me to actually hack away at that wheel. I additionally discovered that the launch management system appeared to short-shift first gear in a reasonably jerky vogue.
The day after autocross, although, I hit the observe and the GTD got here alive. The automobile, per the handbook, was track-prepped by including a level of damaging camber (see picture beneath on the best way to alter the suspension) and eradicating the mesh hood vents to assist with each entrance downforce and cooling. And it simply rips.
Positive, the GTD is 4,400, but when there are three issues that may cover over two tons of curb weight, it’s an 815 pound motor, a literal ton of downforce (at 180 mph), and rolling pins for tires. I’m removed from a racecar driver, however I hammered the throttle and despatched the GTD by means of sweepers at speeds that would have separated cream from milk. I mashed on the brake pedal and squeezed these six-piston Brembo calipers laborious in opposition to these 16.5-inch entrance pizzas, with these 325mm entrance tires scrubbing off pace and the nostril darting into the flip confidently as I leaned onto the throttle on the way in which out and listened to five.2-liters of supercharged V8 fury roar throughout the desert.
If there’s one time period I can use to explain how the Mustang GTD drives, it’s “simple.” I turned traction management fully off, and I nonetheless hooned the beast across the observe with out getting killed. It actually wasn’t too way back that, had I advised you a few 4,400 pound, 815 horsepower automobile, you’d probably have replied with: “Appears like a deathtrap.” The GTD is something however. Its mixture of downforce, enormous tires, huge observe width, absurd engine, transmission that shifts really completely and is all the time in the appropriate gear once you need it to be, and on-board traction management trickery yields one of the crucial approachable high-horsepower automobiles I might ever have imagined.
You possibly can completely romp on the GTD. In my case, the automobile’s capabilities have been to date past my expertise that I actually felt comfy giving it what a minimum of to me felt like the beans. It was hilariously enjoyable, with my solely actual criticism being that my seat was clicking all over. I don’t know if a bolt was free or if there was simply slop within the mechanism, however relative movement between your butt and a automobile will not be one of the best ways to really feel “at one” with a machine.
On street, it was the identical story: Simple. Positive, there was some street noise, and there was a little bit of bumpiness, however in regular mode one might each day drive a GTD with only a few complaints aside from what I’m positive could be single-digit gasoline economic system.
There are some sensible considerations with daily-driving a GTD, after all. There’s no trunk, so it’s a must to throw all of your junk behind the entrance seats close to the clear suspension statement window:
After which there’s the inside, which might be each journalist’s criticism. A $330,000 automobile with primarily the identical inside as a daily Mustang that prices 20 % of the worth?!
It’s a legitimate criticism, but it surely’s once more one other instance of the place the insistence of this automobile being a Mustang comes with compromises. Personally, I’m nice with the inside aside from the rotary dial shifter, which I contend belongs in a minivan and never a supercar.
Ford Achieved Its Purpose. The Consequence Is A Ridiculous Halo Automotive
We return to the criticisms I discussed on the high of the piece: 1. The GTD is an excessive amount of of a Mustang for its value and a pair of. The GTD isn’t a Mustang.
Neither is incorrect. For $330,000, possibly you could possibly ask for a automobile that doesn’t share a lot of an inside with a automobile 20% its value. Possibly you could possibly ask for a seat that doesn’t rattle round (Ford says this was a Pre-Manufacturing unit). Possibly you don’t wish to need to cope with the compromises related to attempting to adapt an current physique into supercar-status. Possibly the concept of plasma-cutting quarter panels and trunk flooring feels a bit too primitive for you. Possibly this doesn’t appear to be supercar packaging:
However whereas the above could not appear to be it belongs in a supercar, it does belong in a racecar, and that’s what Ford was going for right here — a racecar for the street. Nonetheless, the complaints are legitimate.
So is the second level about this not being a Mustang. Whereas I personally suppose it is a Mustang given the way it’s constructed, and that its Mustangness led to a bunch of compromises that rivals haven’t needed to deal, you could possibly make the argument that when you’ve bolted in a wholly new pushrod rear suspension and changed the entrance MacPherson strut setup for a multilink design — all at appreciable price — what you might have is not a Mustang. Sure, Ford technically has tailored the S550 platform to point out the artwork of the potential with these bones, however with all of the chopping up of the physique, all of the bolt-on adapters, and the loopy excessive value, have you ever actually confirmed what your engineers can do with the Mustang platform or have you ever simply proven which you can pay Multimatic sufficient cash plasma-cut your automobile into one thing that may deal with effectively?
There are many methods to spin the Ford Mustang GTD, however right here’s my view: It’s superior.
Sure, it’s in some methods not probably the most elegantly engineered automobile, and it does positively really feel extra racecar-y than supercar-y. However no one requested Ford for the Mustang GTD. It’s not going to make the corporate a ton of cash. It’s a preposterous, completely pointless train attempting to adapt the S550 platform right into a aggressive supercar, and doing so was clearly a tall activity given all of the slicing and dicing and the heavy MSRP, however that’s precisely the form of factor I really like. Simply going out and doing one thing ridiculous simply as a result of.
No matter facet of the “is it too Mustang or is it not sufficient Mustang” argument you’re on, one factor I can promise you: If you see a Mustang GTD in individual, it’s going to cease you in your tracks.
I actually wasn’t positive it could do that; I believed people would see “simply one other Mustang.” However I couldn’t have been extra incorrect. The Mustang GTD attracts in everybody like a moth to a flame. Even folks with only a passing curiosity in automobiles comprehend it’s one thing particular, and might’t assist however ask questions.
Ford’s aim was to do a sub 7-minute Nürburgring lap, to create a technical showcase for the Mustang model, and to create a halo automobile. I’m not saying the Ford Mustang GTD is ideal, but when these have been the objectives, I’ve to say Ford pulled it off.
All Photos: Ford Motor Firm or David Tracy or Griffin Riley
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