[Panoz60]

David,

Pinion angle is (in my opinion) a tuning tool and can dramatically affect the car's behavior, especially on track-out. I'll try to keep this short....
1. I have always judged pinion angle by the difference in degrees between the driveshaft and the pinion itself. 3-5 degrees is a good baseline. if the car is getting too much forward bite, it can lift the front and cause understeer on track-out after the apex. If there isn't enough angle, you can spin the tires.
2. If you are experiencing wheel hop, you ARE spinning the tires. A few possible culprits a) not enough pinion angle. b) too much rebound in the rear shocks. c) rear tires are toast (too many heat cycles) or not enough air pressure in the rears. (yes, with too much rear pressure it can spin the tires, but it shouldn't wheel hop) Wheel hop is normally caused by the tire deformation under acceleration, so increasing the pressure can marginally stiffen the sidewall and decrease the deformation. This is all assuming you have your rear springs dialed in, and the only real way to do that is with a 7-post, a skid pad, or lots of track-time tuning.

If I were you I would add a degree or two of pinion angle, not going past 5 degrees. If that improves it but doesn't solve it, I would adjust the rebound in your rear shocks. If there is too much rebound resistance, it won't allow the spring to react quickly enough. If your shocks are not adjustable, it's time for a rebuild.

Hope this helps ??