Welcome to the IMSA History unofficial website

This site is aimed at bringing you memories from the glory days of sportscar racing in the US.

Contribute

 Contact



Constructor Cunningham Racing Inc.
Chassis 4130 chromoly steel tube structure
Body aluminium/steel.
Suspension Front and rear suspension featuring individual unequal length A-arms and coil springs with adjustable shock absorbers, adjustable rear sway bar.
Gearbox Nissan Racing 5 speed with Hewland gears.
Dimensions
Wheelbase : 2570mm
Front track 1490mm
Rear track 1475mm
Engine Nissan turbocharged V6, overhead cam, aluminum heads, aluminum block, 2,75L, prepared by Electramotive, Inc. Garrett AiResearch twin turbochargers. Nissan Performance Technology-prepared electronic engine control processor.


IMSA GT racing was fiercely competitive in the late 1980s. The 1988 GTO championship was fought between the RWD AAR Toyota Celicas against the turbocharged Roush Racing XR4Tis. Scott Pruett end up taking the driver's championship at the wheel of the Mac Tools sponsored Ford Sierr..err… Merkur. The 1989 championship was looking to be a good one. Not only was Nissan going to debut its new twin turbo 300ZX race car, but Audi was also coming out to play with a brand new machine. Fresh from winning the 1988 Trans Am championship, Audi had designed a brand new car specifically for IMSA; the infamous 90 Quattro GTO. Packed full of recently banned Group B rally technology, the car also had some seriously legendary names at the wheel: Hans Stuck, Hurley Haywood, Scott Goodyear and Walter Rohrl. Reigning champions Roush Racing stepped up to the plate with an updated car. Their successful road race chassis were cloaked with new bodies; Mercury Cougars if you can believe that… and fitted with some trusty 6.0L V8 power.. when in doubt go with displacement huh? Driving chores were taken up by Pete Halsmer and Wally Dallenbach Jr. For the 1989 IMSA season, Toyota vacated the GTO class to try their hand at the top GTP category. Their Japanese rivals, Nissan had already mastered the prototype class and extended their American racing campaign by entering two 300ZX cars in the GTO class. Campaigned by Clayton Cunningham racing, the 1200kg tube chassis racer was powered by a 24 valve, 3 liter V6 VG type engine, boosted by two Garrett turbochargers. The Z32 styled racer was reported to develop between 650bhp and 750bhp. The 300ZX's first success came at Mid Ohio in 1989 where John Morton managed to take third place behind the Cougar XR7 of Wally Dallenbach Jr and the winning Audi 80 of Hans Stuck. Unfortunately this set the pattern for the car's first season; it played second fiddle to the Audi-Roush battle for the rest of the year. At the end of the year, it was Pete Halsmer who took the Championship for the Roush Mercury team.

For the 1990 racing season, Audi disappeared back to Germany, but a new contender was already waiting in the wings: Mazda Motorsports and their new GTO spec RX7 FC. They wasted no time and signed up the reigning champion, Pete Halsmer and veteran driver, Elliot Forbes-Robinson. Quite a beautiful car no? Pictured at Topeka in 1990, the 300ZX race had evolved into a serious racing winning car. Millen took three overall GTO victories that year: Miami, Mosport, and Road America. Unfortunately his points total was only enough to net 4th in the driver's championship, behind the two Mercury Cougars and Halsmer's RX7. The 1990 champion was a young Robbie Gordon. When I look through the IMSA results tables I see Millen's team mate, Canadian Jeremy Dale, retired on the 7th lap of the IMSA GT race at Topeka in 1990. It appears that Mark Windecker was there to capture that moment on film… poor guy… He looks devastated!

Roll on to 1991 and the 300ZX continued to gain competitiveness. The results tables show a straight fight between Mazda, Ford and Nissan at the front of the grids. Millen won Long Beach, Road America, Watkins Glen and Lime Rock with Dale taking the spoils at Mid Ohio. Unfortunately this was not enough to keep Pete Halsmer's factory RX7 at bay. The Mazda driver won at Palm Beach, Miami, Mosport, New Orleans, Laguna Seca and rarely finished off the GTO podium in '91. By season's end, he was champion elect once again with Roush Ford driver Robbie Gordon in 2nd and fellow Mazda driver Price Cobb in third. Dale ended up in fourth, with Millen holding down fifth. Inconsistent results really hurt Millen's campaign that year.

For 1992 Mazda pulled out of IMSA GT racing and Cunningham Motorsports were left with the Roush Racing Mustangs and the Rockensports Racing Olds Cutlass' as their key rivals in the newly created GTS category. This was a year to remember for Steve Millen. He won at Miami, Mosport, Mid Ohio, New Orleans, and Lime Rock Park and took the overall IMSA GTS Championshiop. Nissan also won the manufacturers title for the first time too. A new team mate was signed to partner Steve Millen for the '93 season: a certain Johnny O'Connell. Pictured here at Road America, he was instantly on the pace and won at Laguna Seca. The team also look top GTS honours at the Sebring 12 hours, but overall it was a tough season, as Steve was sidelined for the rest of the year from a racing accident at Watkins Glen, on June 26th 1993. The overall 1993 IMSA GTS championship went to the Tom Kendall Roush Racing Mustang. 1994 was the year of revenge for Steve Millen and the the Cunningham Racing 300ZX. The list of racing acheivements from that year is stunning: -Overall Victory at the Daytona 24 Hours -Overall Victory at the Sebring 12 Hours -Fifth overall at the Le Mans 24 Hours -IMSA GTS Drivers Champion -IMSA GTS Manufacturers Championship Such was the competitiveness of the 1994 car, that IMSA banned their twin turbo engine. Nissan answered this challenge by developing a V8 engine for the 1995 season but it was all for nought when Steven Millen suffered career-ending accident at Road Atlanta. The program scraped along without him to the end of the season but by year end it was curtains for the Cunningham Racing 300ZX.



 Chassis list