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

cbaclawski · 05-12-2019

For background, I have a 1990 ZR-1 with the Lingenfelter 368 package that has been outfitted for road course duty.

After a bad first outing involving a failing master cylinder and a tire wall, I replaced the Master, all 4 calipers, front rotors, installed the DRM bias spring, and am running Hawk DTC-70 race pads/Motul 660 fluid/Sumitomo staggered 160tw tires.

Finally got the car back on track a couple days ago, and working brakes are nice to have (though I'd still only call them "adequate" not great by any means).

Now that I've been able to run a few laps, I can honestly say that this car feels like it is actively trying to spin in every corner! The line between power oversteer and lift off oversteer is virtually non-existent. It is an absolute handful just to get it around the course, let alone post a decent laptime.

You guys think this is:

1-something specific to my car?

2-a C4 thing, go find a dragstrip?

3-poor driving by me? (have 50+ days, many with professional instruction at this track driving everything from a Mazda rx-8 to a v12 vantage S - Though I make no claims on being a great driver, I'd say I'm at least experienced, and average)

What would you do to address the handling? A big wing in the back? Coilover's?(rides kinda high in the back) Slicks? Learn to drive? Something else?

Love the car, and it's a blast on the straights, but it's overall not really fun at the track getting lapped by cars with <1/3 the power. (I'm even about 4 sec/lap faster in my rx-8 with 140 lb/ft at the crank on a good day)

HELP!

05-12-2019	#1
cbaclawski Join Date: Feb 2017 Location: waxhaw, nc Posts: 93	Car actively trying to swap ends on track? For background, I have a 1990 ZR-1 with the Lingenfelter 368 package that has been outfitted for road course duty. After a bad first outing involving a failing master cylinder and a tire wall, I replaced the Master, all 4 calipers, front rotors, installed the DRM bias spring, and am running Hawk DTC-70 race pads/Motul 660 fluid/Sumitomo staggered 160tw tires. Finally got the car back on track a couple days ago, and working brakes are nice to have (though I'd still only call them "adequate" not great by any means). Now that I've been able to run a few laps, I can honestly say that this car feels like it is actively trying to spin in every corner! The line between power oversteer and lift off oversteer is virtually non-existent. It is an absolute handful just to get it around the course, let alone post a decent laptime. You guys think this is: 1-something specific to my car? 2-a C4 thing, go find a dragstrip? 3-poor driving by me? (have 50+ days, many with professional instruction at this track driving everything from a Mazda rx-8 to a v12 vantage S - Though I make no claims on being a great driver, I'd say I'm at least experienced, and average) What would you do to address the handling? A big wing in the back? Coilover's?(rides kinda high in the back) Slicks? Learn to drive? Something else? Love the car, and it's a blast on the straights, but it's overall not really fun at the track getting lapped by cars with <1/3 the power. (I'm even about 4 sec/lap faster in my rx-8 with 140 lb/ft at the crank on a good day) HELP!