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Author Topic:   Spring Rate Changes
WesternAuto17
Dirt Full Roller

Total posts: 32
posted May 14, 2001 08:41 AM
Basic Question -- All else being equal, what effect does increasing/decreasing spring rates on each corner specifically have? Example -- increasing RR will loosen the car, what does increasing the LR do?

cmiller51
Dirt Roller

Total posts: 15
posted May 14, 2001 02:47 PM
Tightens the car-coming off.

stroker-chief
Dirt Roller

Total posts: 12
posted May 15, 2001 08:58 AM
so to continue this topic.... adding shims to the left rear spring would increase the spring rate and therefore loosen the car?? correct??

stroker-chief
Dirt Roller

Total posts: 12
posted May 15, 2001 09:00 AM
i'm sorry read it wrong..... add shims to rr to loosen car???

stroker-chief
Dirt Roller

Total posts: 12
posted May 15, 2001 11:03 AM
yikes... the more I read this the more I confuse myself...... I should make sure I am comparing apples to apples here... would adding shims do more to increase spring rate, or ride height ( increase weight to that corner, or decrease weight?)?

WesternAuto17
Dirt Full Roller

Total posts: 32
posted May 15, 2001 11:15 AM
My limited experience says increasing RR loosened the car at the middle and exit of the turn. My question is what will crazy spring rates do? I trusted the guy I bought the car from when he told me the spring rates, but I took the fronts out this weekend and found out I was wrong. The car had 800 on the RF and 900 on the LF and pushed severly in the center. I've swapped the 800 for a 1000 on the RF and I'm wondering what to expect. In theory, it should push worse, but the split was backwards before, could that have created the push? I figure I'll start at 1000 RF, 900 LF, 100 LR and 175 RR and go from there.

Racer4
Dirt Forum Racer

Total posts: 93
posted May 15, 2001 12:42 PM
Allright sounds like you found part of your problem right there, and try the 1000 in the RF and take away some of your front tire stagger, you can allway's experiment with the 900 in the RF and 800 in the Lf too. Tell us how it works this week OK. Get closer to straight up on the front and run 1.5 to 2.0 on the rear. Did you ever get it on the scales? are you gonna scale it after the spring change?

poboy2
Dirt Forum Racer

Total posts: 95
posted May 15, 2001 08:11 PM
I too would like to know how shimming the rearend will affect handling.

BK19
Dirt Forum Racer

Total posts: 97
posted May 15, 2001 10:05 PM UIN: 40696038
i can tell you this if you add shims to the left rear it will tighten the car up by putting more wieght on the left rear tire. you can tighten the car up by lowering the tire pressure on the left front tire also. or loosen the car up by adding pressure to the left front and lowering the right front

WesternAuto17
Dirt Full Roller

Total posts: 32
posted May 16, 2001 11:33 AM
Last week I was broke, so I didn't race. Hopefully this week will be the first with the new stuff I've gotten from you guys. You've given me a ton to think about. I probably won't be able to scale the car before this friday nite, but I hope to before next week. Once I get the percentages correct, I'll be able to ask more informed questions. One more question -- what is the logic behind upping the pressure on the LF and lowering it on thr RF to loosen up the car? I would think that would have the opposite effect, but I don't know.

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