1989 Nissan R89C

 
Low downforce configuration:

Downforce:
1350 lbs. @ 150 mph
1944 lbs. @ 180 mph
2400 lbs. @ 200 mph
3456 lbs. @ 240 mph

A High downforce configuration:

Downforce:
2250 lbs. @ 150 mph
3240 lbs. @ 180 mph
4000 lbs. @ 200 mph

Reference: Ian Bamsey's The Anatomy and Development of the Sports Prototype Racing Car

ęCopyright 2004, Michael J. Fuller