Car actively trying to swap ends on track? - ZR-1 Net Registry Forums

d15b7 · 05-12-2019

hey there. I own a (totally stock except for the sumitomo tires) 1990 ZR-1. and I hold road racing licences with SCCA and NASA and VRG and others, plus I'm a certified instructor for Porsche and BMW CCA and NASA and others. my ZR-1 predominantly understeers unless you are rolling on the power too quickly and then it transitions to very easily correctible oversteer. the car is a pussycat to drive, especially compared to my two race cars (Lotus Super Seven vintage racer and my fast car, a Honda Civic with a K24 engine swap and a big turbo (around 550 whp, and less than 2400 lbs with me in it) stripped and caged with fully adjustable suspension/coilovers/double adjustable shocks.

so -- I'd most definitely say that there is something very amiss with your car. most likely as others have stated the suspension is really off; have a good race shop do a good 'track ready' 4 wheel alignment. have them check to make sure that none of the bushings/ball joints are bad or binding. your car should be fun to drive on track and not a white knuckle ride!

PS if you want better braking performance out of the stock calipers try getting some Raybestos ST43 pads for it; I know they are expensive but they are fantastic and basically will not fade. ever. my Honda runs 15" wheels which limit me to 11" front rotors and the ST43s are the only pads that will last over a 25 min session stopping from 160+ mph at VIR raceway. I've tried all the others (hawk, porterfield, carbotech and others). the ST43s are simply amazing.

05-12-2019	#11
d15b7 Join Date: Oct 2014 Location: elkton, md Posts: 16	Re: Car actively trying to swap ends on track? hey there. I own a (totally stock except for the sumitomo tires) 1990 ZR-1. and I hold road racing licences with SCCA and NASA and VRG and others, plus I'm a certified instructor for Porsche and BMW CCA and NASA and others. my ZR-1 predominantly understeers unless you are rolling on the power too quickly and then it transitions to very easily correctible oversteer. the car is a pussycat to drive, especially compared to my two race cars (Lotus Super Seven vintage racer and my fast car, a Honda Civic with a K24 engine swap and a big turbo (around 550 whp, and less than 2400 lbs with me in it) stripped and caged with fully adjustable suspension/coilovers/double adjustable shocks. so -- I'd most definitely say that there is something very amiss with your car. most likely as others have stated the suspension is really off; have a good race shop do a good 'track ready' 4 wheel alignment. have them check to make sure that none of the bushings/ball joints are bad or binding. your car should be fun to drive on track and not a white knuckle ride! PS if you want better braking performance out of the stock calipers try getting some Raybestos ST43 pads for it; I know they are expensive but they are fantastic and basically will not fade. ever. my Honda runs 15" wheels which limit me to 11" front rotors and the ST43s are the only pads that will last over a 25 min session stopping from 160+ mph at VIR raceway. I've tried all the others (hawk, porterfield, carbotech and others). the ST43s are simply amazing.