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Spring Rate Chart for Evo X

 
Old Aug 16, 2008, 07:54 PM
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Lightbulb Spring Rate Chart for Evo X

I think it's time to start a sticky on all the different Springs and Coilovers out there for the Evo X. If you have any additions or corrections, please post here and I or a moderator will update the stats. I'm starting to add in a "Street Price" which is an approximate average of prices seen with a basic google search and may not be 100% accurate. Just keep in mind that sometimes you get what you pay for and the lowest price vendors may or may not include the same (or any) support after the sale when it comes to tuning your suspension.

Springs and Shocks:

Springs ...................... Front Rate ........ Rear Rate ...... Front/Rear Drop ...... Street Price


Stock GSR ...................... 3.5 kg ........... 2.8 - 3.7 kg .......... 0.0" / 0.0" ................. OEM
Stock MR ........................ 3.5 kg**........ 2.9 - 3.8 kg .......... 0.0" / 0.0" ................. OEM
Cobb ........................... 3.2-4.6 kg ......... 3.6 - 4.9 kg ......... 1.3" / 1.4" ................ $225
Eibach Pro .................. 2.6 - 4.9 kg ...... 1.8 - 4.8 kg .......... 1.2" / 1.0" ................. $220
GTWORX Tarmac ............ 5.5 kg ................ 5.5 kg ............. 1.2" / 1.0" ................. $299
H&R ............................... 4.2 kg* ......... 3.4 - 4.4 kg* ....... 1.4" / 1.3" .................. $200
Muellerized ...................... ? kg .................. ? kg ................ 0.7" / 0.6" ................ $350
Swift Sport Mach ........ 2.7 - 4.3 kg ...... 2.3 - 4.4 kg .......... 1.0" / 0.6" ................. $300
Swift Spec R ................... 5.5 kg ............... 5.5 kg ............. 1.25" / 1.0" ................ $315
Tanabe GF210 ............... 4.5 kg ............... 3.5 kg ............... 0.7" / 1.1" ................ $220
Tanabe DF210 ............... 4.5 kg ............... 3.3 kg ............... 1.1" / 1.4" ................ $220
Tein S-Tech .................... 4.2 kg ............... 3.8 kg ............... 1.4" / 1.0" ................ $220
Works .5" ...................... 3.8 kg*........... 3.2 - 4.3 kg*......... 0.5" / 0.5" ................ $265
Works .9" ...................... 3.8 kg*........... 3.2 - 4.3 kg*......... 0.9" / 0.9" ................ $265

* Spring rates estimated:
Cobb based on +10% front/rear
Works based on +10% front/+15% rear
H&R based on +20% front/rear (may even be +25%)

** Estimated based on rears being very close to the GSR

Shocks .......................... Damping

Stock KYB (GSR) ............... Preset
Stock Bilstein (MR) ........... Preset

Coilovers:

Coilovers .................... Front Rate ....... Rear Rate ............ Damping ..................... Front/Rear Drop ........... Street Price

AMR ............................. 8.0-12.0 kg* ... 9.0-14.0 kg* ........... 8-way ............................ Adjustable .................... $2100
Apexi S1 .......................... 8.0 kg ............. 6.0 kg ................ 20-way............................ Adjustable .................... $1500
AST 4100 series .......... 7.0-14.0 kg* ... 9.0-16.0 kg* ... Multi-way / Single ................. Adjustable .................... $2300
AST 5100 series .......... 7.0-14.0 kg* ... 9.0-16.0 kg* ... Multi-way / Single ................. Adjustable .................... $2700
AST 5200 series .......... 7.0-14.0 kg* ... 9.0-16.0 kg* .... Multi-way / Dual .................. Adjustable .................... $4100
AST 5300 series .......... 7.0-14.0 kg* ... 9.0-16.0 kg* ... Multi-way / Triple .................. Adjustable .................... $5500
BC Racing .................... 6.0-10.0 kg* ... 6.0-10.0 kg* .. Multi-way / Single dual .......... Adjustable .................... $1000
BC Racing Inverted ..... 6.0-10.0 kg* ... 6.0-10.0 kg* .. Multi-way / Single dual ........... Adjustable .................... $1200
BC Racing ER series .... 8.0-12.0 kg* ... 8.0-12.0 kg* ...... Multi-way / Dual ................. Adjustable .................... $1850
Cusco Zero-1 .................... ? kg ............... ? kg .................... Preset ............................ Adjustable .................... $1500
D2 Racing RS .................... ? kg ............... ? kg .............. 36-way / Single ................... Adjustable ...................... $850
Eibach Pro-Street-S ......... 6.3 kg ............. ? kg .................... Preset .................. 0.8"-> 2.0" / 0.8"-> 2.0" ....... $1000
Eibach Multi-Pro R1 .......... 8.0 kg ........... 6.0 kg ...... Multi-way / Single dual ..... 0.8"-> 2.0" / 0.8"-> 2.0" ....... $1700
Eibach Multi-Pro R2 ........... ? kg ............... ? kg ............. 10-way / Dual ............. 0.8"-> 2.0" / 0.8"-> 2.0" ....... $2100
Endura-Tech ................... 10.0 kg ......... 10.0 kg ...... 15-way / Single dual ................ Adjustable .................... $2000
Greddy Type S ................. 8.0 kg ........... 8.0 kg ....... 32-way / Single dual ................ Adjustable .................... $1300
HKS Hipermax III ............. 7.0 kg ........... 5.0 kg ....... 30-way / Single dual ................ Adjustable .................... $1800
HKS Hipermax III Sport ... 12.0 kg ......... 10.0 kg ...... 30-way / Single dual ............... Adjustable .................... $1900
JIC FLT-FAS ..................... 10.0 kg ........... 8.0 kg ................. 10-way ................ 0.5"-> 2.5" / 0.5"-> 2.5"........ $1800
JIC FLT-TAR Soft .............. 10.0 kg ........... 8.0 kg ....... 15-way / Single dual ..... 0.5"-> 2.5" / 0.5"-> 2.5".........$1850
JIC FLT-TAR Hard............. 11.0 kg .......... 14.0 kg ....... 15-way / Single dual ..... 0.5"-> 2.5" / 0.5"-> 2.5".........$1950
JRZ RS ............................... ? kg ............... ? kg ............. Multi-way / Dual ................. Adjustable .................... $4600
JRZ RS Pro ......................... ? kg ............... ? kg ............. Multi-way / Dual ................. Adjustable .................... $5300
JRZ 2-way Race ................. ? kg ............... ? kg ............. Multi-way / Dual ................. Adjustable .................... $7600
JRZ 3-way Race ................. ? kg ............... ? kg ............ Multi-way / Triple ................ Adjustable .................... $8900
JRZ 4-way Race ................. ? kg ............... ? kg ............. Multi-way / Quad ............... Adjustable .................. $13100
K-Sport Kontrol Pro .......... 9.0 kg ........... 7.0 kg ........ 36-way / Single dual .............. Adjustable ..................... $850
KW Variant 3 ................... 8.0 kg* ......... 9.0 kg* ........... 14-way / Dual ........... 0.4"-> 2.0" / 0.8"-> 2.2" ....... $2200
KW Clubsports ................ 9.0 kg* ......... 11.0 kg* .......... 14-way / Dual ........... 0.4"-> 2.0" / 0.8"-> 2.2" ....... $2600
KW RobiSpec Streets ....... 8.0 kg* ......... 9.0 kg* ........... 14-way / Dual ........... 0.4"-> 2.0" / 0.8"-> 2.2" ....... $2400
KW RobiSpec Clubsports .. 9.0 kg* ........ 11.0 kg* .......... 14-way / Dual ........... 0.4"-> 2.0" / 0.8"-> 2.2" ....... $2800
KW RobiSpec Competition 9.0 kg* ........ 11.0 kg* .......... 14-way / Triple .................. Adjustable .................... $8000
Megan Street .................. 8.0 kg ............ 6.0 kg ........... 32-way / Single ................... Adjustable ..................... $900
Megan Track ................... 12.0 kg ......... 10.0 kg .......... 32-way / Single ................... Adjustable ..................... $900
Ohlins Stage III DFV ...... 10.0 kg* ......... 7.0 kg* ................ 25-way .......................... Adjustable ................... $3300
Stance GR+ ..................... 10.0 kg .......... 9.0 kg ................. 15-way .......................... Adjustable .................... $1300
Stance GR+ Pro ............... 14.0 kg ......... 14.0 kg ................ 15-way .......................... Adjustable .................... $1400
Stance AL+ Pro ............... 14.0 kg ......... 14.0 kg ................. 15-way .......................... Adjustable ................... $1550
T1R B52 ....................... 8.0-10.0 kg ..... 6.0-8.0 kg ......... 24-way / Single .................. Adjustable ................... $1200
Tein Type Flex ................. 12.0 kg ......... 10.0 kg ..... 16-way / Single dual ..... 0.5"-> 2.4" / 0.0"-> 2.6" ......... $1750
Tein Monoflex .................. 12.0 kg ......... 10.0 kg ..... 16-way / Single dual ..... 0.9"-> 3.0" / 0.2"-> 2.7" ......... $2000
Tein Super Racing ........... 12.0 kg ......... 10.0 kg .......... 16-way / Dual ........... 0.9"-> 3.0" / 0.2"-> 2.7" ......... $3600
Zeal Function Xs ............ 10.0 kg* ....... 10.0 kg* ................. 6-way .......................... Adjustable .................... $2200
Zeal Function X .............. 12.0 kg* ....... 12.0 kg* ................. 6-way .......................... Adjustable .................... $2200
Zeal Super Function ....... 14.0 kg* ....... 14.0 kg* ................. 6-way .......................... Adjustable .................... $2200

* Custom spring rates may be available
Coilover Damping Info:

Single (rebound only)
Single Dual (compression and rebound adjusted together with one knob)
Dual (compression and rebound adjusted independently)
Triple (compression high/low and rebound)

Conversion Chart:

Spring rate conversions kg/mm to lbs/in
(Data from Vankuen in the Evo 1-9 forums)

1lb = 0.45359237 kg
1in = 25.4mm

.45359237 / 25.4 = .017857967322834645669291338582677

So now we know that 1lb/in = .01785 kg

kg/mm to lbs/in
-----------------------------
2.0 = 112
2.5 = 133
3.0 = 168
3.5 = 196
4.0 = 224
4.5 = 252
5.0 = 280

5.5 = 308
6.0 = 336
6.5 = 364
7.0 = 392
7.5 = 420
8.0 = 448
8.5 = 476
9.0 = 504
9.5 = 532

10.0 = 560
11.0 = 616
12.0 = 672
13.0 = 728
14.0 = 784
15.0 = 840
16.0 = 896

Last edited by Hiboost; Mar 7, 2012 at 10:24 AM.
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Old Aug 16, 2008, 08:23 PM
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Coil overs:

BC: 8/6 but can be revalved at time of purchase (free?)
Stance GR+ 10/10
Stance GR+ Pro 14/14

KSport: 9/7
Megan: Street series 8kg/6kg, Track series 12kg/10kg

Last edited by goofygrin; Aug 17, 2008 at 08:43 PM.
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Old Aug 18, 2008, 07:13 AM
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Originally Posted by goofygrin View Post
Coil overs:

BC: 8/6 but can be revalved at time of purchase (free?)
Stance GR+ 10/10
Stance GR+ Pro 14/14

KSport: 9/7
Megan: Street series 8kg/6kg, Track series 12kg/10kg
Thanks for the updated info, I'll be sure to check here every few days to get the stats entered in.

If anyone can get the Stock MR Spring Rates as well as the Eibach Pro that would be awesome:

Stock MR ....................... ?? kg ............... ?? kg ................ 0.0" / 0.0"

Eibach Pro ................. ?? - ?? kg ......... ?? - ?? kg ............ 1.2" / 1.0"
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Old Aug 18, 2008, 07:53 AM
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Zeal Function Xs / Xs-Aluminum / X / X-Aluminum / T / A: Custom spring rate w/ matched valving can be specified at time of order (no extra charge)

Zeal Super Function: 14/14 spec; Custom spring rate w/ matched valving can be specified at time of order (not sure about extra charge)
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Old Aug 18, 2008, 08:17 AM
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Thank you for putting in the time to do this.
Not a problem, will be fun to see what is out there for our X's this way and have it in a central place.

Originally Posted by goofygrin View Post
Maybe we should put MSRP/Street prices on there as well? Just so that you know how much each of them costs without having to PM/email a bunch of vendors (who will not get back to you ;-)
It may be a rough guide as to what to expect but I'm on the fence about how easy it will be to keep updated. Plus different vendors will be discounting them at all kinds of percentages making the retail prices hard to compare.


I was also thinking for the Coilovers we could possibly post an adjustable range of ride height like:

+1.0" to -2.3" / +1.2" to -2.1"

Obviously the optimal settings are not going to be the maximum slam but some want the range for car shows and then return them to realistic ride heights for driving. I would imagine that rally drivers may actually raise the ride height as well. Trouble is getting that kind of info for all the coilovers and still be somewhat accurate. I guess I could leave that column listed as "adjustable" unless we get the numbers for that coilover.

Last edited by Hiboost; Aug 18, 2008 at 08:25 AM.
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Old Aug 19, 2008, 01:55 PM
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I did some searching on Eibach Pro spring rates and found the numbers above quoted. They seem in line with being about +30% stiffer than stock, but progressive for front as well as the rear.
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Old Aug 21, 2008, 04:45 AM
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I haven't seen HKS springs or coilovers available for the Evo X yet. If you or anyone else finds some stats and where to buy I'll update the chart.

I put in the Robispec KW Streets, no idea on the stats though.

Last edited by Hiboost; Sep 7, 2008 at 07:49 AM.
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Old Sep 7, 2008, 08:42 AM
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Added Damping column to Coilovers.

Corrected some specs for Tanabe GF210 Springs and Zeal Coilovers.

Added in Tein Springs and Coilovers to the list.

Still could use the stock spring rates for the Evo X MR.

Last edited by Hiboost; Sep 12, 2008 at 04:42 PM.
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Old Sep 8, 2008, 04:11 PM
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This may be a dumb question, but why is every coilover at least twice the stock spring rate? Are we comparing apples to apples when looking at the spring rate of a traditional spring kit vs. coilover? Do coilovers ride that much more harshly, and would something like Eibach be a realistic option for the track?

Thanks.
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Old Sep 9, 2008, 06:37 AM
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Originally Posted by Tractionlimit View Post
This may be a dumb question, but why is every coilover at least twice the stock spring rate? Are we comparing apples to apples when looking at the spring rate of a traditional spring kit vs. coilover? Do coilovers ride that much more harshly, and would something like Eibach be a realistic option for the track?

Thanks.
The spring rates are measured the same way on Lowering Springs as well as Coilovers. The biggest difference is that Lowering Springs are limited by what spring rates they can use if they are going to be used properly with the stock OEM shocks. Typically you will only see 10-30% increased spring rates and often progressive rate springs will minimize the impact on how much of that you feel in daily driving. If the spring rates are too high they will wear out the shock faster and could actually hurt the handling of the car if the shocks can't control them properly.

Coilovers can get away with higher spring rates because they also include upgraded adjustable dampers that allow you to tune them to the spring rates depending on what kind of ride you want. Most will adjust for compression and rebound where a softer setting will be a bit easier on the street to a point and stiffer settings are more for smooth race tracks. Going too far in either direction of adjustment in relation to the spring rate will make the car ride as if it's out of balance. If the settings from front to rear are not tuned to each other properly you can also get that porpoise effect where the whole car oscilates out of balance front to rear.

A well setup coilover combo doesn't always have to be harsher on the street, but if the roads are really rough you would definitely feel the increased spring rates and firmer ride. Where Coilovers really shine is on a relatively smooth race track where weight transfer on a good setup is precise and predictable when compared to the OEM springs and shock combo that often lets the car roll too far for crisp handling.

I'm no suspension guru by any means and this is just what I've read over the years. Perhaps we can get someone with first hand knowledge to add to that as I didn't really find any good links that talk about the differences when I did a quick google search.
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Old Sep 17, 2008, 07:20 AM
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Added info for Eibach Pro-Street, HKS Hipermax III, and HKS Hipermax III Sport Coilovers.
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Old Oct 10, 2008, 01:04 PM
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Old Oct 20, 2008, 05:51 PM
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Why is the rear end lowered more compared to the front on most springs? Its obvious that the front end has more wheel gap.
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Old Oct 28, 2008, 04:18 PM
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That's a good question, it may have to do with the clearance to the body and greater suspension travel in the front. Considering if you turned the wheel to it's most extreme angle and hit a bump you wouldn't want it to hit your body panels. Might be more of a carryover from the rally days since the last time I saw extremely lowered cars at the road course there were cars with 1/2" of wheel gap and no allowance for hitting a bump with the wheel turned.
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Old Jan 21, 2009, 05:11 PM
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Stance changed their spring rate on GR+ from 10k/10k to 10k/9k, just FYI
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