GT40s.com - View Single Post - CdA of a GT40

Cliff Beer · 03-23-08, 03:46 AM

The Audi box, with the right gear set, can certainly well exceed 165 - I can attest to that personally as measured with a GPS on a long straight and flat road in the eastern part of my home state. That was achieved with a mildly tuned 302 with about 385hp/370torque at the flywheel, mirrors temporarily removed, clamshell seams taped, just under 4 inches of ground clearance at the front and about 4.75 rear. Be sure to have about 1.5 degree of nose down attitude and your doors firmly secured. Needless to say, make sure you have at least Z-rated tires. Indicated speed was 179 at 6,200rpm and the front end did not feel like she wanted to lift even with a few bumps and undulations in the road. With a little taller gearing and another 100hp I'm would guess that 195 is quite possible. So, net, 165 is not that big of a number for a properly set up gt40.

There's always a faster gun - my brother got to 191 (gps) in his highly tuned Esprit S4S on the same stretch before he felt like the driver's door glass was at risk of getting sucked out.

03-23-08, 03:46 AM	#16 (permalink)
Cliff Beer Cliffbeer2 3 Tenths Join Date: Jun 2007 Location: Sand Point, WA GT40: CAV Posts: 334 Rep Power: 5	Re: CdA of a GT40 - Calculate your optimal gearing... The Audi box, with the right gear set, can certainly well exceed 165 - I can attest to that personally as measured with a GPS on a long straight and flat road in the eastern part of my home state. That was achieved with a mildly tuned 302 with about 385hp/370torque at the flywheel, mirrors temporarily removed, clamshell seams taped, just under 4 inches of ground clearance at the front and about 4.75 rear. Be sure to have about 1.5 degree of nose down attitude and your doors firmly secured. Needless to say, make sure you have at least Z-rated tires. Indicated speed was 179 at 6,200rpm and the front end did not feel like she wanted to lift even with a few bumps and undulations in the road. With a little taller gearing and another 100hp I'm would guess that 195 is quite possible. So, net, 165 is not that big of a number for a properly set up gt40. There's always a faster gun - my brother got to 191 (gps) in his highly tuned Esprit S4S on the same stretch before he felt like the driver's door glass was at risk of getting sucked out.