Other racing series

Audi 100 GTO - C4 extreme

Models Racing Special
Rallye Pikes Peak TransAm IMSA Talladega DTM STW DTM2000 LeMans Others
French Touringcars Natural gas A4 Type44Q SCCA ITB Coupes Type44 in Finland Type44 in the USA Belcar C4 extreme

Special thanks go to Pyry who translated the following article from Finnish to English and provided the scans as well!

The text is so great, that I will just add some remarks in [brackets].

History: This car is one of two identical racers built in 1992, under the supervision of Andre van de Watt (who was chief of VW motorsport in ´98 when the article was written), based on IMSA GTO regulations to compete in the South African sportscar championship. The chassis were built by taking brand new Audi 100s, stripping them of all bodypanels and other excess and then molding new panels from kevlar and carbon fibre. Then the bodies were packed up along with the internals of an Audi 90 IMSA-GTO and shipped off to South Africa. The cars won every race they we´re entered in and took all class track records aswell. Risto Buri located the car and 1995 and Pertti Kuismanen (Remember the name?) needed little convincing to buy it for a reasonable 1.5 million Finnish marks [225000US$]. The car was then shipped back to Ingolstadt without the engine, gearbox and drivetrain because the toll costs of importing the complete car would´ve been astronomical. It´s sister car was put in a museum.

The puzzle was then completed by using parts from the vaults of Audi´s motorsport division. The engine is from an Audi 90 IMSA-GTO, the six speed gearbox is from a ´90 DTM quattro and most of the chassis and suspension components were from a ´91-´92 V8 DTM Evo. Pertti Kuismanen then campaigned this Über-Audi very successfully in Finnish Super Saloons, for example winning 11 of 13 starts and 13 of 13 poles during the ´96 season. In 1997 he drove the car in the German STT aswell as in Finland.

Tech Data:
Car: Steel "bodyshell" with kevlar and carbon fibre bodypanels, carbon fibre undertray, lexan windows and heatable triplex windshield
Onboard monitoring system: Micro Dynamics MDE1, 24 channels
Engine: 5cyl inline, aluminum block, 2190cm^3 (bored over from 2133cm^3), aluminum 20 valve cylinder head, two cams (rotating in opposite directions); Mahle pistons 81mm diameter, compression ratio 7.2:1; dry sump lubrication, oil tank and cooler in the trunk, oil capacity 13l; Bosch Motronic 1.7 engine management system, 5 coils, 2 electronically controlled injector nozzles per cylinder; water cooled KKK K27 turbocharger with adjustable wastegate 2.35-3.60 bar boost pressure, intercooler. The cylinder head, cylinder block and magnesium dry sump oil pan "tied" together with titanium bolts to withstand high boost pressures; max power output (quoted) 530 kW (720 bhp) @ 8030rpm, max torque 634Nm @ 8030rpm (rumoured power 800-950bhp); weight 80kg.
Clutch: Sachs, two plates with 190mm diameter
Drivetrain: Aluminum shell six-speed gearbox from a 1990 DTM V8 quattro, synchronized h-pattern gearshift, permanent awd 55/45 (front/rear) distribution, titanium axles, Ferguson center diff.
Chassis: Coilovers front and rear, titanium triangular suspension arms with reactive bars (DTM V8 Evo ´92), Eibach progressive springs, Koni shocks, adjustable anti roll bars front and rear, rear bar adjustable from cockpit; cooled disc brakes 375x36 front, 358x30 rear, titanium four piston brake calipers; three part 11-15x18 inch rims, inner part 7, 8 or 9 inches, outer parts 4 or 5 inches, titanium lugnuts, tires 305/645-18 Pirelli P Zero, 325/650-18 and 350/650-18 Avon Speedrace.
Dimensions: Width 200cm, weight 1196kg, ground clearance 30-40mm
Service interval: Engine four races with max. 8 hours, basic maintenance 50000FIM [7500US$], complete rebuild 250000FIM [37500US$]
Performance: Top speed 279kph [173mph] with longest drive ratio currently in use (over 350kph [217mph] with narrow tires, smaller wings and longer gears); 0-100kph in 2.5 sec and 0-200kph in 9.9 sec with 4.85 final drive and medium 5th and 6th gears; fuel consumption approx 1.5km/l or 67l/100km

Note: Kuismanen was apprehensive of doing a maximum attack standing start because the titanium axles had proved weaker than steel ones and he didn´t want to stress the drivetrain too much (the weak link), so the performance figures aren´t entirely accurate :) He also warned the road tester of what it would cost to rebuild the engine and then at the end of the session destroyed it himself...

(1) Side: No aerodynamic wonder, the frontal area of the car is so big it moves as much air as a good sized lorry at top speed, the exhaust comes out of the hole beneath the WIPAK lettering.

[This must be one hell'o'lorry, doing 300km/h and creating loads of downforce ;)]

(1) Engine: Engine-# MGT-11, the turbocharger sucks air through the tiny air filter. When the revs rise above 5500rpm all hell breaks loose

[Now, I have seen bigger air filters on 75PS cars! I wonder if the rules forced Kuismanen to do this.]

(1) Interior: The rev counter red line sits at 8500 rpm, the two gauges to the left are used to monitor engine temp and fuel. The lower of the two digital displays is used for displaying boost pressure, the turbo screw is one of the knobs to the right. The upper display is used for monitoring oil pressure and temp, fuel pressure and temp, cooling water temp, exhaust pressure etc. The Momo steering wheel has the buttons for radio and rear bar adjustment. The Recaro seat weighs 2.9kg. The gearshift is a standard H-pattern.

[Note the extra cooling fan left to the board with the sponsors. And especially watch all those lines in the place where the co-driver seat was. Those must be the lines to and from the coolers in the trunk. Looks like a snake-pit!]

(1) Rear: nice trunk lock

[Noteworthy is the big opening through which the hot air from the various coolers in the trunk can escape. The diffusor is nothing short of spectacular.]

(1) Suspension: The brakes are from a DTM Evo, most of the suspension parts are titanium and hideously expensive...

[Note the red cooling "pipe" to the disks and the onboard car-jack in the lower left area.]

In 1996, the car had extra parts on the rear wing and a single large exhaust. (2)
In 1998, the extra pieces were gone, the exhaust consisted of two pipes and the opening looked a bit improvised. The rear view mirrors now were larger and the front wing attachments had grown, too. (3)

Models Racing Special
Rallye Pikes Peak TransAm IMSA Talladega DTM STW DTM2000 LeMans Others
French Touringcars Natural gas A4 Type44Q SCCA ITB Coupes Type44 in Finland Type44 in the USA Belcar C4 extreme

(1) Scanned by Pyry from the 10/98 issue of Tekniikan Maailma.
(2) Scanned by Pyry from the book Ruutulippu 1996.
(3) Scanned by Pyry from the book Ruutulippu 1998.
If you want to get into contact with Pyry, just drop _me_ a line, I'll forward the stuff.
Copyright 2001 Jens
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