Roll couple and rear tire spin |
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Roll couple and rear tire spin |
yeahmag |
Feb 19 2018, 06:09 PM
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#1
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Advanced Member Group: Members Posts: 2,422 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California |
Just got through my first autocross after the rebuild and the car was great! With a good friend and hot-shoe behind the wheel the car was the 2nd fastest aircooled car and #7 PAX adjusted in a pretty big field (PCA OCR).
I'd like to get better control of the rear, inner tire. We were spinning it up quite a bit. I'm thinking more rear spring is the correct approach. Current set up: Front: 21mm torsion bars 19mm sway bar set 3/4 hard Rebel Racing Bushings Monoball camber plates 19mm raised spindles Bilstein Sports 2.5 degrees camber 5 degrees caster 1/16" toe out Rear 225lb springs Rebel Racing Bushings No rear bar Koni Yellows (full soft) 2.0 degrees camber 1/16" toe in Tires are fairly used up Hankook C71 Z214 in a square set up (205/50-15) run at about 22lbs hot. Granted replacing the tires would help, but even when they were new it would spin these up. I have 275lb springs sitting around that I can swap in. Am I heading in the right direction? Me https://www.youtube.com/watch?v=hdMUYqusga4 Evan (damn he's fast) https://www.youtube.com/watch?v=mI6O_gVzPuA |
yeahmag |
Feb 20 2018, 05:16 PM
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#2
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Advanced Member Group: Members Posts: 2,422 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California |
Chris, I'll see if I can "get" that last adjustment on the roll bar. I'll also see if I can hunt down stiffer front torsion bars. Right or wrong, I'm one to want to mess with spring rate and just fine tune with the front bar (vs. using it as a major component of the suspension).
Do you have a preferred set up for an aggressive autocross car? |
ChrisFoley |
Feb 20 2018, 07:58 PM
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#3
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I am Tangerine Racing Group: Members Posts: 7,928 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None |
... Do you have a preferred set up for an aggressive autocross car? Not really. I've always worked with what was available at the time, trying to get the spring rates close enough that the front anti-sway bar could be adjusted to get the balance close. In the case of your car, I would prefer either 1mm bigger front torsion bars or 25lb smaller rear springs. I would also prefer a larger anti-sway bar. Ideally the anti-sway bar adjustment range would be enough to induce oversteer, or understeer at the extremes. |
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