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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Advanced Member Group: Members Posts: 2,421 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 |
brilliantrot |
Feb 20 2018, 06:27 PM
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Member Group: Members Posts: 125 Joined: 27-April 07 From: Costa Mesa Ca. Member No.: 7,699 |
I thought Aaron's car felt pretty darn good and i'm not sure I would change anything without putting on some new A7s first as I suspect they would cure any and all complaints with grip.
With the low friction suspension mounts in there, removing all that stiction does free up the suspension a little to the point of needing stiffer springs then I think many have used in decades past. Other then lighting up an inside tire a little too much, it was incredibly balanced and I would be hesitant to upset that too much. For what it's worth I ran 200lb rear springs on my old 914 with the elephant poly bronze trailing arm bushings and always considered going up to 225 because the rear felt pretty soft with some roll oversteer but I don't remember having inside wheel spin issues as much. I also ran pretty fresh tires on the car all the time so it's hard to say. Maybe tender springs are the answer to keep some down pressure on the inside wheel under droop? Not sure we were getting enough roll to unseat the springs but I always wanted to add some to my 914 to try it but got lured to the dark side of 911s before that ever happened. If I had driven a 914 at all in the last 9 years or not let 4 years lapsed since doing any real performance driving, the car would have had fastest aircooled on some really old, not exactly spectacular tires even when they were new so I think the car works pretty darn good as is. Evan Fullerton |
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