spring rates..

[SLEEPERracer]

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!

[Dave]

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!

The numbers on the side somehow correspond to the rates - someone here who has them already should be able to tell you if you can post the numbers.

The GCs come with any of dozens of rates.

[Mystikal]

There is no standard rate.

As Dave said, post the numbers and we can tell you.

[SLEEPERracer]

well theres two #'s on both spings il just post both

front- 162852
GC150.64.66

rear- 145389
GC140.64.83

[royalflush313]

well theres two #'s on both spings il just post both

front- 162852
GC150.64.66

rear- 145389
GC140.64.83

The numbers on the GC springs are in metric, so here is the conversion:

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

[SLEEPERracer]

The numbers on the GC springs are in metric, so here is the conversion:

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

cool! thanks!

[1991 318is]

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.

[rwh11385]

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.

i was curious what are wheel rates were for the e30....

thanks!

[1991 318is]

Wheel rates

I got the info from here:

http://e30m3performance.com/tech_articles/susp-tech/eff_rate/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)=213

[rwh11385]

the effective wheel rate is the right one. i read it today on bimmerforums and the club racers there would know.

http://forums.bimmerforums.com/forum/showpost.php?p=5057424&postcount=13

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 .46

http://forums.bimmerforums.com/forum/showpost.php?p=4291430&postcount=8