Quote:
Originally Posted by Grey 65
FYI: The stock spring rates are WAY too soft for any type of track day or autocross. The correct spring rates will depend on the shocks you run. I have nitrogen filled shocks/struts so I run somewhat soft spring rates. I run 375lb Hypercoils up front and 600lb Hypercoils out back.
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I have tracked my car hard on a full race course several times for several hours and found the car to be pretty good and about right. Funny, it's one of the few compliments that I have about a Backdraft. I checked suspension travel, front and rear, and it was at an acceptable range.
Many folks think that they automatically have to stiffen everything up and it just isn't true. There is a science to it. You say they are way too soft...please tell us what you mean by that and how you determined this...
Suspension 101 is that you determine a proper spring rate and match the shock to the spring, not the other way around. The first tweaking one might do is with the anti-roll bars...which is more difficult with this car...all depends on how serious you want to be. BTW, check your ride heights with the driver in the car or the appropriate number of cinder blocks in the front seat and floor.
Check my gallery for a pic of some fat Goodyear stock car tires in my rear wheel wells under load...stock springs and shocks and no rub. A stiffer anti-roll bar would be the first thing I work on if I were still doing this.