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S197 Handling Section For everything suspension related, inlcuding brakes, tires, and wheels.

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Old 05-27-2009, 09:59 PM   #1
socalwrench
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Default S197 GT Spring Rates and Heights (no guessing allowed)

ALL the REPUTABLE SPRING RATES and LOWERING HEIGHTS are on this thread. This way I, and many others, can make an informed decision. It is my understanding that the FR500 springs use a modified design and wouldn't apply to the typical street car- such as a full coilover setup. This thread excludes full bodied coilovers.

Thanks to SteedaGus and F1Fan (Chip) for helping complete this information.

As of September 2009:
Name- (part number)- lowering amount- spring rates

Stock/Factory GT springs (Tags= Yellow, Orange) - front: 136lb/in / rear: 142lb/in

Eibach Pro-kit (pn 35101.140) / Ford Racing (K-springs) (pn M-5300-K) 1.5/1.7 - both variable front: 173-248lb/in / rear: 195-236lb/in

Eibach Sportline (pn 4.10135) 1.6/2.0 - UNKNOWN (*tested by Chip- reportedly very high)

Steeda Ultra-lite (pn 555-8206) 1.25/1.5 front: 195lb/in / rear: 175lb/in

Steeda Sport (pn 555-8216) 1.0/1.25 - front: 200lb/in / rear: 175lb/in

Steeda Competition (pn 555-8241) 1.0/1.25 - front: 225lb/in / rear: 185lb/in

H&R Sport (pn 51655) 1.0/.75 - UNKNOWN

H&R Super Sport (pn 51655-77) 1.7/1.9 - both variable (working rates) front: ~250lb/in / rear: ~200lb/in

H&R Race (pn 51655-88) 1.5/1.4 - both variable (working rates) front: ~300lb/in / rear: ~275lb/in

Roush Performance {sold in pairs} (pn 401294 and 401295) 1.0/1.0 - UNKNOWN

Roush Extreme (pn 402331) 1.0/1.25 - UNKNOWN

Tein H-tech (pn SKG12-BUB00) 0.94/1.65 - front: 163lb/in / rear: 163lb/in

Tein S-tech (pn SKG12-AUB00) 1.5/2.24 - front: 174lb/in / rear: 174lb/in

Vogtland (pn 950084) 1.3/1.3 - variable front: 160-240lb/in / variable rear: 120-220lb/in

Saleen/Racecraft (pn 10-1302-B12999) 1.25/1.25 - UNKNOWN

Sprint (pn 2115) 1.6/1.5 - UNKNOWN

BMR Fabrication Inc. (pn SP009) 1.25/1.5 - variable front: 120-165lb/in / linear rear: 140lb/in

*NOMINATED STICKY*

CHECK OUT PAGE 4 - post #33 - FOR MORE ACTUAL TEST DATA
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Last edited by socalwrench; 09-19-2009 at 11:05 AM.
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Old 06-01-2009, 09:29 AM   #2
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I've gathered the amount of lowering, but need help filling in the spring rates.
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Old 06-01-2009, 10:00 AM   #3
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i don't know any of the rates... maybe, since Sam sells a lot of those springs, he may be able to chime in with info? I would be shocked if he didn't have that stuff on file somewhere.
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Old 06-01-2009, 05:06 PM   #4
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I don't know who Sam is, but anything he can add would be great.
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Old 06-03-2009, 01:45 PM   #5
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Steeda Ultra-lite (pn 555-8206) 1.25/1.5 (exact unknown- APPROX. front: 195in/lb rear: 175in/lb)

Steeda Competition (pn 555-8241) 1.0/1.25 225in/lb front, 185in/lb rear

Last edited by SteedaGus; 06-03-2009 at 01:47 PM.
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Old 06-04-2009, 10:34 AM   #6
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Thanks for the additional information, it has been entered.
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Old 06-05-2009, 01:21 PM   #7
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good initiative socalwrench....this would be very useful info.
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Old 06-05-2009, 04:01 PM   #8
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Anyone know what the stock spring rates are?
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Old 06-05-2009, 04:44 PM   #9
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Here's a thread on TMS that has some info about the Bullitt springs...

http://forums.bradbarnett.net/showthread.php?t=470588
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Old 06-05-2009, 06:32 PM   #10
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Quote:
Originally Posted by jahudso2 View Post
Anyone know what the stock spring rates are?
I could have sworn I heard 175f/150r stock but don't quote me on that. Feels about right to me after running Steeda sports and then comps.

H&R Races must be in the 250/200 f/r range. Those springs were so low and so tight!
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Old 06-05-2009, 06:32 PM
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