Ride Height
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Race Director
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From: Fremont Ca
2022 C4 of the Year Finalist - Modified
I got my words screwed up,the longer spring bolts relaxing the spring changes the tension ON the spring.
Last edited by Z51JEFF; Dec 12, 2021 at 04:03 PM.
Race Director
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the spring is attached to the differential, spring drops differential drops, spring doesnt know whether you have 6 or 8 or 10 inch bolts.
Race Director
Joined: Dec 2003
Posts: 14,171
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From: Fremont Ca
2022 C4 of the Year Finalist - Modified
Not going to argue with you,your logic here makes no sence. Post this issue in the TECH section and see what kind of responses you get.
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Last edited by MelWff; Jan 8, 2022 at 03:10 PM.
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From: SW Florida.
you are mistaken. the spring ends are hung from the trailing arms by the 2 long bolts. longer bolts hang the spring lower than shorter bolts. and since the car is attached to the center of the spring it drops lower. at roughly half the amount the bolt is longer. you want to increase the tension on the spring put 2 or 3 people on the back deck of the car.
Race Director
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From: SW Florida.
before messing with ride height, measure your ride height. anything under 28 inches from the top of the wheel opening to the road is in the ball park. and do not go too long on the rear bolts. a flat tire and 10 inch bolts will dig into the road. if it happens at speed, bad things will happen.
Drifting
Joined: Nov 2007
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From: New York
For the rear, I would get 10 inch bolts and cut the excess off. You need to set your D height.
Last edited by cottoneg; Jan 14, 2022 at 06:48 AM.
Pro
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From: Kannapolis NC
before messing with ride height, measure your ride height. anything under 28 inches from the top of the wheel opening to the road is in the ball park. and do not go too long on the rear bolts. a flat tire and 10 inch bolts will dig into the road. if it happens at speed, bad things will happen.
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With 10” bolts and those 15” wide wheels, be careful the end of the spring doesn’t contact the tire sidewall. Also, longer bolts do not relax the spring, the tension remains the same as the weight on the spring remains the same. Think of it this way, the spring compresses the same amount, but the TA position is higher given the longer bolts, lowering the car.
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From: SW Florida.
you get about half the extra bolt length in lowered rear height. stock bolt is-i believe- 6-1/2 inches. so 8 inch bolt would get you about 3/4 inch. cut 10 inch bolts down to 9. 10 scares me. removing 1 leaf will also work, but a lot more doing. any replacement spring will cost 300 some bucks and raise the rear.
Race Director
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From: Fremont Ca
2022 C4 of the Year Finalist - Modified
Here,I'll slow it way down for you. Take a spring,put it between your index finger and thumb,squeeze the spring. Did the spring get harder to compress as you shortened the spring length? That's about as basic as it gets.
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The leave spring is not a variable rate coil spring.
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From: Forked River NJ
You are 100% correct on this. The longer or shorter bolt does not compress or relieve the spring at all. It just raises or lowers the rear of the car. It has nothing to do with changing the spring rate.