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Spring Rate Chart

 
Old Feb 22, 2004, 09:07 AM
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Spring Rate Chart

Here is a list of the spring rate's for the Evo 8. If you know of any more, or if you have a corraction, let me know and I will change it.
Thanks.

Evo Spring Rates   
Lowering Springs   
NameFrontRearDrop
Eibach Pro-Kit**165lbs(2.9k)140lbs(2.5k)1.2f / 1.2r
Espelir ASD263lbs(4.7k)319lbs(5.7k)0.79f / .79r
Espelir GT308lbs(5.5k)330lbs(5.9k)1.7f/ .98r
Ralliart280lbs(5.0k)307lbs(5.5k)0.5f / 0.5r
RSR**224lbs(4.0k)280lbs(5.0k)1.4f / 1.4r
RSR Ti2000280lbs(5.0k)336lbs(6.0k)1.4f / 0.8r
Tanabe GP210:256lbs(4.6k)319lbs(5.7k)1.5f / 1.0r
Tein High Tech**196lbs(3.5k)268lbs(4.8k1.4f / 0.3r
Tein S Tech**212lbs(3.8k)291lbs(5.1k)2.0f / 0.9r
** = progressive rate

Originally Posted by SmikeEvo
Stock F: 180 R: 225. 0 Drop.
Swift Sports F: 179 (helper section) 269 (main rate) R: 207 (helper section) 319 (main rate) (157-314 for MR)
Swift Sports MR F: 179 (helper section) 269 (main rate) R: 157 (helper section) 314 (main rate)
Swift Spec Rs F: 157 (helper section) 358 (main rate) R: 196 (helper section) 380 (main rate)
Swift Spec Rs MR F: 157 (helper section) 358 (main rate) R: 153 (helper section) 380 (main rate)
GTWorx (near linear) F: 290 R: 330

***How to read the Swift rates: Softer rate is the collapsible side (like a helper spring). The higher number is the main spring rate. The total spring rate on the vehicle is 109lb/inch (front)* / 129lb/in (rear)* before the progressive end is fully collapsed. Fully collapsing the lower spring rate. Therefore, the riding rate on the Swifts is the maximum rate given.

*F: (Spring Rate A * Spring Rate B) / (Spring Rate A + Spring Rate B) -- (157*358)/(157+358) = 109lb/in.
*R: (Spring Rate A * Spring Rate B) / (Spring Rate A + Spring Rate B) -- (196*380)/(196+380) = 129lb/in.

***** MR differences: Rear MR springs are 3-4mm higher than the GSR versions. Reason is for the increase pressure the Bilsteins have.

NOTE: Swift SpecRs are now black.

This information is direct from Swift USA.
Coilovers   
BrandFrontRearAdjustable?
APEXI PRO560lbs(10.K)560lbs(10.K)Adjustable
CUSCO Zero 1392lbs(7.0K)280lbs(5.0k)Adjustable
CUSCO Zero 2392lbs(7.0K)280lbs(5.0k)Adjustable
CUSCO Zero 2R392lbs(7.0K)280lbs(5.0k)Adjustable
HKS Hypermax II392lbs(7.0k)336lbs(6.0K)Adjustable
HKS Hypermax RS336lbs(6.0K)280lbs(5.0k)Adjustable
HKS Kansai Tarmac448lbs(8.0K)448lbs(8.0K)Adjustable
HKS Kansai Track896lbs(16.K)784lbs(14.K)Adjustable
HKS Performer392lbs(7.0k)336lbs(6.0k)Adjustable
HKS PRO672lbs(12.K)672lbs(12.K)Adjustable
JIC FLT A2560lbs(10.K)504lbs(9.0K)Adjustable
OHLINS FLAG LAnyAnyAdjustable
OHLINS R/T448lbs(8k)560lbs(10k)Adjustable
Ralliart336lbs(6.0K)336lbs(6.0K)Adjustable
Tein Basic392lbs(7.0k)336lbs(6.0K)Adjustable
Tein Flex672lbs(12.K)560lbs(10.K)Adjustable (Corrected 6/6/06)
Tein SS392lbs(7.0k)336lbs(6.0k)Adjustable
Tein RA672lbs(12.K)504lbs(9,0K)Adjustable
Tein HA504lbs(9.0K)392lbs(7.0K)Adjustable
Tein HT896lbs(16.K)672lbs(12.K)Adjustable
ZEAL336lbs(6.0K)280lbs(5.0k)Adjustable
ZEAL Also448lbs(8.0k)392lbs(7.0k)Adjustable


Edit: Edited Tein Flex adjustable as per info from chmodlf

Originally Posted by Vankuen View Post
I was looking through the spring rate chart for various vendors, and thought this might be useful.

1lb = 0.45359237kg
1in = 25.4mm

.45359237 / 25.4 = .017857967322834645669291338582677

So now we know that 1lb/in = .017857967322834645669291338582677.

So if we want a spring that's roughly 560lbs; we'd multiply both sides by 560, and come up with roughly a 10k spring rate. Alternatively if you already know the kg/mm rate and want to find out what the lbs/in is, just divide the spring rate by that reaaally long factoral above (the .0178...).

But just in case you all didn't want to go through all that, here's a chart:
kg/mm to lbs/in
16 = 896
15 = 840
14 = 784
13 = 728
12 = 672
11 = 616
10 = 560
9.0 = 504
8.5 = 476
8.0 = 448
7.5 = 420
7.0 = 392
6.5 = 364
6.0 = 336
5.5 = 308
5.0 = 280
4.5 = 252
4.0 = 224
3.0 = 168
2.0 = 112

Last edited by golgo13; Oct 13, 2014 at 04:14 PM.
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Old Feb 22, 2004, 10:53 AM
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Great Post!

Anybody know what the drop on the RALLIART springs are?
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Old Feb 22, 2004, 11:38 AM
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Anybody know what the drop on the RALLIART springs are?
.5"
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Old Feb 22, 2004, 12:33 PM
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Is that the right spring rate for the stock springs? If so why are the Eibach springs so soft, I was looking into getting a set. I like the fact they only have a 1" drop all around.
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Old Feb 22, 2004, 04:20 PM
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Hopefully you got the data from the manufacturers and not from message boards.
RS-R has different figures. http://www.rs-r.com/suspension_springs.htm
I'd also take rates for progressive spring with a grain of salt, since they're not static like linear springs.
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Old Feb 22, 2004, 05:51 PM
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nOOdle,
Thanks for the web site. I when looking for it and never found it. The chart has been updated.
Keep them coming!! From what I hear and found, The Eibach Pro-Kit are soft.

Last edited by Tri-Bar; Feb 22, 2004 at 05:53 PM.
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Old Feb 22, 2004, 08:00 PM
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What are the Evo's stock spring rates?

Is there really that much to be desired with the suspension, that it needs to be modified significantly?

Is there any one company that shines at suspension systems for these cars?

My appologies for being a n00b.
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Old Feb 22, 2004, 09:14 PM
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Your JIC FLT-A2 rates are reversed. The front is 10k and rear is 9k
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Old Feb 23, 2004, 08:39 AM
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Thanks wojo. list has been updated. Does any one know the rates for the Ohlins Road/Sport coilovers I have not been able to find it.
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Old Feb 23, 2004, 08:52 AM
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Originally posted by Audi Shep
What are the Evo's stock spring rates?

Is there really that much to be desired with the suspension, that it needs to be modified significantly?

Is there any one company that shines at suspension systems for these cars?

My appologies for being a n00b.
The stock spring rate are soft front 180lbs(3.2k) rear225lbs(4.0k). The struts and shock are highly valved for high speed damping,but lack the low speed we need for the street, will know more on them when I can get over on a shock dyno to test them out better. There are a few stand outs on the suspension system side. Cusco, JIC, Ohlins,DMS. I my self are looking into the Ohlins for a good over all system(street and track).
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Old Feb 23, 2004, 05:32 PM
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ralliart is .5 all the way around.... ? I was hoping 1" .... what about the Espleirs?

-shahul
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Old Feb 23, 2004, 09:21 PM
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Shahul X, not sure about the Espleirs. I will try and look into it.
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Old Feb 24, 2004, 06:38 AM
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Originally posted by Evo Ate
Is that the right spring rate for the stock springs? If so why are the Eibach springs so soft, I was looking into getting a set. I like the fact they only have a 1" drop all around.
Because they are progressive rate. I think that information needs to be added.
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Old Feb 24, 2004, 07:57 AM
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thanks TRi

-shahul
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Old Feb 24, 2004, 08:20 AM
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Instigator.
Which spring is progressive rate ? Stock or the Eibach's I will add this to the list. Thanks.
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