i just bought ground control coilovers....what is the spring rate? i got the one where it says it fits the stock, konis, and tokico shocks. anybody know the spring rate? planning to change to a higher rated spring just curious of what the regular ground control springs have. thanks!
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Originally posted by SLEEPERraceri just bought ground control coilovers....what is the spring rate? i got the one where it says it fits the stock, konis, and tokico shocks. anybody know the spring rate? planning to change to a higher rated spring just curious of what the regular ground control springs have. thanks!
The GCs come with any of dozens of rates.Current Cars2014 M235i2009 R56 Cooper S1998 M31997 M3
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Originally posted by SLEEPERracerwell theres two #'s on both spings il just post both
front- 162852
GC150.64.66
rear- 145389
GC140.64.83
Front: 6" spring height, 2.5" spring diameter, 375lb/in spring rate
Rear: 5.5" spring height, 2.5" spring diameter, 475lb/in spring rate~ Go Canucks Go! ~
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Spring rates and wheel rates.
The calculated wheel rates for an E30 are .94 for the front and .67 for the rear.
375 X (.94)=352
475 X (.67)=318
Using the wheel rate rather than the spring rate allows comparisons between cars and eliminates any confusion as to the rear of an E30 being sprung "stiffer" than the front. Although the rear has a stiffer spring, the actual wheel rate is less than the front.
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Originally posted by 1991 318isThe calculated wheel rates for an E30 are .94 for the front and .67 for the rear.
375 X (.94)=352
475 X (.67)=318
Using the wheel rate rather than the spring rate allows comparisons between cars and eliminates any confusion as to the rear of an E30 being sprung "stiffer" than the front. Although the rear has a stiffer spring, the actual wheel rate is less than the front.
thanks!
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Wheel rates
I got the info from here:
http://e30m3performance.com/tech_art.../eff_rate2.htm
Actually , the author says the way I have done it for years is wrong. That I was calculating the motion ratio of the wheel to the spring and not the actual spring rate of the wheel. I sort of agree with him but honestly I don't really know. Maybe someone here knows enough to tell.
Wheel rate the author's way:
375 X (.88)=330
475 X (.45)=213Last edited by 1991 318is; 01-06-2006, 09:30 PM.
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the effective wheel rate is the right one. i read it today on bimmerforums and the club racers there would know.
Bimmerforums is the preferred online BMW Forum and community for BMW owners. At Bimmerforums, you will find technical how-to information maintenance specifics audio advice wheel and tire combinations and model specific details not found anywhere else. Our professionals are here to help make sure you find the answers you need to your questions and our community is here to help other brainstorm ideas for the future.
Motion ratios for an e36 are, Front: .94 spring and shock, Rear: 1.05 shock/.65 spring.
wheel rate = spring rate x (motion ratio)^2, wheel rate = spring rate x (.65)^2
or
wheel rate = spring rate x .46Bimmerforums is the preferred online BMW Forum and community for BMW owners. At Bimmerforums, you will find technical how-to information maintenance specifics audio advice wheel and tire combinations and model specific details not found anywhere else. Our professionals are here to help make sure you find the answers you need to your questions and our community is here to help other brainstorm ideas for the future.
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