Bunchies

iTrader: (1)

I have a set of coilovers that I am having built at ground control. I need to pick the front and rear spring rates. My choices for the front are: 350, 375, 400 and the rear can go 340, 380, 440.

I was thinking of a 400F/340R rate. Currently, it's at 375F/250R.

aznpoopy

400/340 would be my choice out of those rates.

anything else has the front rear rates very close to each other, or the rear higher than the front... seems like a recipe for a tail happy car, all other things being equal.

Bunchies

iTrader: (1)

yeah, i just figured that if it turned too tail happy at 400/340 then i could just remove the rear sway bar.

Pat McGroin

I have 385 front and 300 rears. I got the softest rates for the size springs I ordered, once I track the car and learn it, then I'll play around with springrates if need be.

Bunchies

iTrader: (1)

Just remembered that the rears are stock valved koni yellows. Is it safe to move up to a 340lb spring on those shocks?

Howard Coleman

iTrader: (6)

400-340 should work nicely w a dual purpose street/track function. just remember to run 2 to 3 psi less in the rear. your konis will work fine...

25 inch ride height front and rear.

good luck,

howard coleman

ptrhahn

iTrader: (9)

^^^

Honestly, not to argue with Howard, but I'd go higher w/ Konis... it'll actually HELP your ride quality. When I had Eibach pro-kits, with are about 365/285 (IIRC), the thing was always crashing down over bumps and such. My GC's are 500/400 and it's actually much better, particularly if you're going to run as low as 25" like I do and Howard suggests.

You'll find that the shock valving has more to do with ride quality than spring rate (within reason) anyway.

Bunchies

iTrader: (1)

yeah, i think i'm going 400/340 and running the rears at full stiff (dyno matched of course)

Nathan Kwok

FWIW I'm running this setup with 450F/350R, 25" ride height, and I'm pretty happy with it.

maxcooper

SA/FB or FC or FD, what car are these for? Looks like an FC in your pic, but I think you are getting "FD advice".

-Max

Bunchies

iTrader: (1)

Woops, sorry, i never specified. It's an FC. Pretty much, the information that I've gathered from multiple forums states that the konis should hold up with a bit of compensation on the damping setting at 340lb. The fronts will be going with 380-400.