Home » Corvette C4 GT1

Corvette C4 GT1

 - Corvette by JPS Racing

Generation: C4
Year: 1987
Race Numbers: 12
Ownership: Tim Clark; JP Sarlin; V Sarlin
Sponsors: Tracey Performance; Tilton; Delco; Valvoline
Drivers: 1986 to 1996 - Tim Clark; 1997 to present - JP Sarlin / V Sarlin

Notes/Race History: Tim Clark raced the tubeframe car for 10 years in various Waterford Hills, SCCA Regional and National races including the 1995 SCCA National championship race at Mid-Ohio. In 1997 the car was sold to JP Sarlin.

 - Corvette by JPS Racing

Tim Clark behind the Corvette in his first colors, Red and Yellow, picture: Mike Odell, Road America , 1985 ?

Original Color: 1rst: Red-Yellow, 2d: Blue, 3rd: Red
Tires/Wheels: Jantes 16" x 12" Goodyear
Engine: 310, 331 and 355, depending on running weight

Modifications: This car was a home-built tubeframe car designed to meet the core of SCCA GT1 rules but almost all pieces are unique to the car. See basic driveline and suspension descriptions, below.

 - Corvette by JPS Racing

Picture from Mark Windecker, at Mid Ohio Sports Car Course in 1987. Unfortunatelly the Tim's Corvette will not finish the race. Final qualifying position was 8 with 26 starters. 

Driveline: The car was built on a surface plate in Tim's shop. The frame was fabricated from large I-beams and 4x6 tubing. Design was derived from information about body and chassis layouts, provided by GM contacts. 5-speed Saenz trans from Argentina with dog clutches and changeable gears. Franklin IRS axles. Cadillac halfshafts and hubs. The rear suspension was Tim’s own design and fabrication using lessons learned from his first car. Shocks were by Delco since he had contacts there. Front suspension was also Tim’s own design and fabrication using lesson learned. Brakes were 13" Tiltons with GM power assist. Later changed to 2 master cylinders with remote reservoirs to avoid lockup at high speeds. The car was originally planned to use ABS but this was outlawed before the car was completed.

 - Corvette by JPS Racing

One plane can hide an other. Pictures taken in France to Orly airport at corvette concentration event in 2006. 

The Corvette is in his last colour, Red, after a full restoration of the car by JP Sarlin who wanted the tubeframe and body in red. The car is fresh as a new one. 

Palmares 1986 1993 - Tim Clark

Palmares 1986 1993 - Tim Clark - Corvette by JPS Racing

The Corvette completed around 42 races with his builder and owner Tim Clarks between 1986 and 1994, including 4 wins, 8 races finished 1rst or 2d, 14 races in the top five, 27 races in the top ten, 6 pole positions.

Raced 1rst or 2d: Indianapolis Region SCCA in 1986, Mid Ohio Western Ohio Region Games in 1987, Waterford Hills Road course in 1989, Indiana Northwest regional grattan in 1989, South Bend region Regional Champ Race grattan in 1993, Mid-Ohio Cincy regional in 1994, South Bend Sprints Grattan in 1994 

 

 

 

Corvette by JPS Racing

Corvette by JPS Racing

Corvette by JPS Racing

Corvette by JPS Racing

Corvette by JPS Racing