Ground Control Spring options

[derbo]

All this talk with suspension changes with LivesNearCostco and threadjacking made me want to make a new thread about changing spring rates on the Ground control coilover system.


So far I have seen 3 options for coilover springs with custom spring rates:


HyperCo
Swift
Ground Control


Now I'm not sure what the spring sizes are.

I am assuming they are 2.5in ID springs but I'm not 100% on the lengths. Anyone know?

[derbo]

Just called Ground Control and they said it is 6" 2.5ID front spring and the rear is a 7" 2.5ID spring. The Koni Yellows that come paired with the GC Coilover system can take up to 600lb/in springs before they need revalving.

[LivesNearCostco]

I think the GC rears tend to get shorter as the rates go up, like 6.5" for a 550 lb/in rear spring instead of 7" for the 430 lb/in spring. GC also supports both 2.5" and 2.25" rear springs--if you switch to 2.25" you have to get a different gold adjuster nut and possibly a different white plastic cone for the back. I think the GC fronts are always 2.5" ID but am not 100% sure.

The highest rate I see in their GC-branded spring list is 550 lb/in but they also sell the Eibach 2.5" ID race springs up to 1400 lb/in and 2.25" ID springs up to 2100 lb/in or more (4000 lb/in?).

[derbo]

Talking to the guy on the phone, he also said they can custom order any spring rate you desire at whatever length


At $59.00 its probably the cheapest option.



Where did you get the idea that they run shorter springs for higher spring rates? I'm just curious cause I'm intetionally trying to get the same length springs so I don't need to change my ride height

[LivesNearCostco]

In their own branded springs (made by Eibach), spring rates >430 lb/in are only available in 6" or 6.5" lengths. The 2.5" ID Eibach 7" springs are available in rates from 275 to 700, but if you use a stiffer spring with the same free length, won't it give you a higher ride height because it compresses less? With an 800 lb corner weight, the 430 lb/in spring would compress ~1.86" while the 550 lb/in spring would compress ~1.45".

[derbo]

i guess a higher ride height wouldn't be too bad as long as long as the ride height raises the same all around! I'm most likely going to call GC and get something along the lines of 450/500. Waiting on a friend to see if he can get me a set of swift springs for cheaper than GC.


Maybe even go 450/550


But i'm emailing back and forth with GC to see what my options would be.

[derbo]

440/550 seems to be the most popular option in the Area here.

440lb/in 6" spring for the front
550lb/in 6.5" spring in the rear

Hyperco doesn't list anything lower than 600lb/in in their catalog for a 2.5" ID 6inch spring


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[danewilson77]

derbo....do you think tracking your car...is why you need a new clutch soon?

[derbo]

derbo....do you think tracking your car...is why you need a new clutch soon?

No. The clutch as been low since I got it from the previous owner. I've been milking it and it's getting high finally.


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[danewilson77]

No. The clutch as been low since I got it from the previous owner. I've been milking it and it's getting high finally.


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OK.

HTC Thunderbolt+TT