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Author Topic:   Spring rate vs Preload
RPM08MOD
Member
posted April 24, 2002 09:12 PM
I run a 3 link with 200rr and 225lr spring the car runs best with about 230#s of wedge but this is really preloading lr spring. What would be the difference if I put in a 325 spring and ran less wedge?


jlfastride
Member
posted April 24, 2002 10:30 PM
i beleive it would free up entry and help the lr bite coming off. not sure though? do you run alot of stagger?


RPM08MOD
Member
posted April 25, 2002 06:47 PM
No I dont run much stagger usually 3/4 to 1/2 on 1/4 mile track and 0 to 1/2 reverse on fast 1/2 mile. My thinking is by putting that much preload on a 225 spring you are basically making it think it is a 325.I thought if I put in a 325 and less preload the car would react the same but I would have more travel bacause of coil bind on the compressed 225.


jlfastride
Member
posted April 25, 2002 09:58 PM
unless you have some kind of progessive rate spring i don't beleive the rate goes up with more load coils don't do that would still be the same rate no matter the preload.


dirtracer14
Member
posted April 25, 2002 11:36 PM
For what it is worth my lr spring is preloaded real bad, i run 16" in the rear. I have a 200 on lr and was gonna try a 225 this year for kinda the same reason to unload the spring just a bit. Now i put the new 225 15" in the car and set ride height. Well i noticed that it was allmost in coil bind and was real tight?? So i pull it out and rate it along with the 16" 200 and as i was looking at the 2 springs the 15" 225 had a tighter wond coil and with the amount of preload i was putting it was to much for the spring. Now the 16" i have the coils are farther apart and allow for the more preload not sure if you get what im tring to explain, but i tried


wfoondirt
Member
posted April 26, 2002 09:05 AM
Spring rate is measured in lbs per inch of compression. So unless its a progressive spring the rate remains constant no matter what amount of preload. JL is correct it would loosen entry and tighten exit.


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