Justindorville

I am after some G2 coilovers and have found a good deal on Ebay for some.

They come with springs on them rated at 7kg front and 5kg rear. Is this going to rattle my fillings out? What you reckon?

Justin

911

For a classic or a heavier New age?

bit hard IMHO for a classic, and a good stiffening for the heavier New age.
I would call those fast road/track day rates.

Justindorville

Its for a 99 sti 6. What spring rate would you recommend for a Classic?

TopBanana

That's 390/280 lbs in old money. Way too hard for everday use, you'd hate it.

911

50/40 for a road/track car, and they will need to be well damped. I tried 60/50 but found them too hard overall but great on a billiard table surface.

Damping has a pronounced effect on the car and hence the comfort. Stiffening the Impreza too much will start to slow it down on B roads against a good stock Sti.

A good rule is to keep the rear rate 80% of the front, ie 50/40 or 5/4 in your units.
iirc the Sti as stock is 40/30 but I stand to be corrected.

Justindorville

Cheers for your help guys. I might be getting some secondhand Cusco ones now instead so hopefully these will be a little softer. I believe they do have damping adjustment on them.

911

Beware that the springs might even be stiffer!
The rate should be on the springs.

aidyc

what is a good spring rate just for road use only, i have a set i my 99 sti and find them too hard, un sure what rate they are, but can you get 40/30 in coilover springs?

911

Yes you can, but coil over spring choice is not always easy. Aftermarket ones come in different lengths as well as rates. Normally they come with the info on the spring, the rate/length or the other way round.
To make it worse they also come in different inside diameters!

Ideally for road a 40/30 is about the same as a stock Sti ie very good indeed for all road use.

Demon Tweeks stock a huge range of springs and they are cheap too. You need to find out the free spring length and the inside diameter first, then get a spring rate to match.

Not all coil-overs use the same inside dia, the AST and other European types use 2.25'' inside dia, the most common available.

The Jap units I believe do not.
The Australian one are metric I think.

Now you know why so many buy european units such as AST!