Published on: Jan 18, 2016 @ 16:32 Originally Published in: 2015 (old website) (C) Jay Auger - website owner & author Notice: Any form of duplication methods (including but not limited to copy/paste of text and screen capture) of the website's content is strictly forbidden.
It is no secret that Audi revolutionised rallying with the quattro and it was not long after that its potential was evident for the legendary Pikes Peak “Race to the Clouds” Int’l Hill Climb event. At the time the track was mostly on gravel which made Audi’s four-wheel drive system a natural asset. In fact, the quattro would become a winner six years in a row; 1982~1987 – three “Open Rally” class wins plus three overall wins and course records.
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Before we get to Walter Röhrl’s very special machine, let’s revisit the events leading to the famous Hill Climb: In 1986, Audi had abandoned their Group B WRC program early in the season due to the spectator deaths in Portugal and other safety concerns. However, some insiders stated that the truth was that Audi was under pressure from parent company Volkswagen to terminate its rally operations since they weren’t competitive any more. Group B itself was eventually banned at the end of the same year which would have ended the quattro, S1 and E2’s rally career notwithstanding.
Many people within Audi Sport felt like the short-lived Sport quattro E2 didn’t achieve nor had proven its full potential, especially versus arch rival Peugeot and their 205 T16. Audi Sport, who’s main motorsport operations were to be shifted to the United States’ own Trans-Am and later IMSA circuit racing, could benefit from a strong, final statement at the country’s most advertised Hill Climb. The Team was thus allowed to prepare a very special version of the S1 – to prove that the quattro can once again reign supreme. It was to be the ultimate iteration of the quattro… you could even say how the Group B quattro might have evolved into if given the chance!
The Pikes Peak quattro no longer had to adhere in any way to the then banned Group B regulations, as such Audi Sport’s engineers would thoroughly revise and improve on the S1 E2 unit beyond those rules. They elected to use the very same Sport quattro lent to Bobby Unser for his record run of 1986 up the famed mountain. The car was then substantially carved about which allowed to lower its weight to about a metric tonne (2,200 lbs) and improve the bias to near perfect balance (Front 50% / Rear 50%).
While the Peugeot engineers tried desperately to stretch the 205 Turbo 16’s wheelbase in hopes to gain more stability, which is usually more suitable to high speed courses such as Pikes Peak, Audi instead retained the same short wheelbase as the S1 rally model. However, the suspension itself was fully revised to even up the quattro’s handling and give the car a more aggressive rake to naturally improve downforce. Yet more stability and higher cornering speeds were achieved via adding-on more aerodynamic components, such as the “double stack” rear spoilers and a very iconic front spoiler, to the already quite aggressive E2 package.
For power, the car sported the same five-cylinder turbocharged engine found in the Group B rally model albeit again thoroughly revised by the engineers at Ingolstadt. Audi Sport stated that it had “officially” around 600 BHP which would put it at about the same power range than the E2 works car as used in the fast-paced 1985 Finland rally. The Pikes Peak engine however employed a much larger K28 turbocharger – making some insiders of the time to claim that the car realistically had closer to a thousand horsepower.
All of this speculating was put to rest when Walter Röhrl later stated in an interview that the engine actually had 750 BHP and that the throttle was like an “on/off switch”, partly thanks to the more aggressive “boost into exhaust” recirculating anti-lag system (ALS). Ironically, the all-out Pikes Peak engine was not married to the then top of the line dual-clutch, power-shifted “PDK” transmission that were used on a few WRC Group B works E2s and retained the proven 6-speed manual transmission with Saxomat clutch activation on the gear lever.
In the qualifying sessions preceding the race, the ultimate quattro expertly driven by Walter Röhrl was about 4 seconds per kilometer faster than Peugeot’s improved 205 T16 “E3”, out of three cars (Ari Vatanen / Andrea Zanussi / Shekhar Mehta), entered in hopes to stop Audi’s reign at the event.
Peugeot Talbot Sport’s director Jean Todt was very impressed by the aerodynamic apparatuses found on the quattro and ordered his lead engineer, Jean-Claude Vaucard, to come up with something similar. Vaucard’s team swiftly devised a front spoiler and other ground effect trimmings, which were hastily riveted on the cars, in addition to stacking another rear spoiler – thus putting the 205 T16’s aerodynamics on par with the Sport quattro.
On race day, the leading 205 Turbo 16 driven by Ari Vatanen however encountered boost issues, reportedly due to a loose clamp on the turbo outlet hose. Walter Röhrl in the Pikes Peak quattro got the golden the opportunity to set a record breaking run of 10:47.850 and be the first ever competitor to reach the peak under 11 minutes – claiming overall victory in a decisive manner.
Going out on top is never a bad thing and in the end Audi Sport won their gamble by giving the quattro one last hurrah – retiring the model from competition as an iconic, enduring legendary champion.
Multiple replicas of the Pikes Peak quattro have since been built by collectors and enthusiasts, which can often be seen in demonstration events such as the Eifel Rallye Festival in Germany.
It is worth mentioning that the “quattro” model is correctly spelled with a small “q” which also can be used to specify the Audi four/all-wheel drive system. For more information about the correct spelling, CLICK HERE!
|Group/Class||Unlimited (Open Rally)||Pikes Peak Special Version|
|Years active||1987||# built: 1|
|Type||I-5, DOHC 20v, gas engine||located front-longitudinal with 27.5oright inclination|
|Output power – torque||
|Materials||block: aluminium||cylinder head: aluminium|
|Ignition||electronic / firing order 1-2-4-5-3|
|Lubrication system||dry sump with oil cooler|
|Type||four-wheel drive||6-speed manual transmission|
|Gearbox ratios||1st: 3.179
|Differential ratio||–||Front, centre, and rear self-locking|
|Clutch||dry – double plate|
|Type||2 door coupe steel/kevlar bodyshell with plastic front/rear bonnets and bumper covers. NACA style roof cooling duct. Aerodynamic “double stack” spoilers to the front and rear of the car to increase downforce. Side deflectors. Single seater and stripped down interior.|
|Front suspension||McPherson strut with lower wishbone, coil spring, gas shock absorber and anti-roll bar.|
|Rear suspension||McPherson strut with lower wishbone, longitudinal radius arm, coil spring, gas shock absorber and anti-roll bar.|
|Steering system||rack and pinion with hydraulic power assistance||12.4:1|
|Brakes||front/rear 4 aluminium piston calipers, front ventilated rotors 330mm diameter, rear ventilated rotors 304mm diameter||dual circuit with servo|
|length: 4250 mm (167.3 in)||width: 1860 mm (73.2 in)||height : 1344 mm (52.9 in)|
|wheelbase: 2224 mm (87.6 in)||front track : 1465 mm (57.7 in)||rear track: 1502 mm (59.1 in)|
|Rims – tires||front and rear
|Dry/Unladen Weight||1000 kg (2205 lb)||Bias Front/Rear%: 50/50 (claimed)|
|Weight/power||1.7 kg/HP (3.7 lb/HP)|
AUDI RECORDS AT PIKES PEAK
- 1982 – John Buffum / Audi quattro / 12:20.520 (Open Rally – class win)
- 1983 – John Buffum / Audi quattro / 12:27.910 (Open Rally – class win)
- 1984 – Michèle Mouton / Sport quattro S1 / 12:10.380 (Open Rally – class win)
- 1985 – Michèle Mouton / Sport quattro S1 / 11:25.390 (Open Rally – overall win & course record)
- 1986 – Bobby Unser / Sport quattro E2 / 11:09.220 (Open Rally – overall win & course record)
- 1987 – Walter Röhrl / S1 PP / 10:47.850 (Open Rally – overall win & course record)
(C) Article by Jay Auger – website owner, main author & chief editor
- Images & videos are the property of their original owners
- Eifel Rallye Festival pictures used under permission – McKlein Publishing
- Timo Witt – Audi Tradition (car specifications)