Is there anyone recently who has Ground Control coilover conversions on Koni Yellow sports for the FD? If so, do you like them?? I can't get a straight answer ouf of ground control as to spring rate for the conversion on Koni Yellow sport shocks, so are they a lot stiffer than stock '93 R1, a little stiffer, as stiff?? I drive the car daily but also autocross it all summer, so I'd like something stiffer than what I have now (stock springs with the Konis) but still streetable.

 

I have GC coilovers over Koni Yellows on my FD. I've been happy with them on the street - haven't yet gotten the car on the track. Note that you can use any standard 2.25" race spring with the coilovers, so you can specify whatever rate and length you want. I'm running 500 lbs/in front, 350 lbs/in rear and find it very tolerable on the street, expect it will be fine for autocross and decent for the track. The GC folks did recommend those rates given my expected use of the car, the shocks, and the sway bars (Suspension Techniques) that I had. The only thing I would change is that they recommended 5" springs in the front, which did not give me enough clearance up front for the street and I had to swap to 6" springs (same rate).

 

Thanks, that's just the info I'm looking for. What length spring did you use in the rear??

 

I didnt know you could change springs, thought you had to go with the Eibec. So what springs are out there that will fit the 2.25" they recommend?

 

OK, I went back and looked at the receipt, and realized my memory wasn't as good as I thought. The front springs were Eibach 0600.250.0500 (6" free length , 2.5" interior diameter, 500 lbs/in); the rears were 0700.250.0400 (7"free length, 2.5" interior diameter, 400 lbs/in). I changed the fronts to 0700.250.0500. The kit for all 4 corners was $600 (threaded aluminum sleeves that slide over the shock body, upper and adjustablelower spring perches, and springs, but without the shocks).

Ground Control sources Eibach race springs in 2.5" interior diameter, various lengths (in 1" increments), and various spring rates (25 or 50 lb increments). Eibach makes their race springs in either 2.25" or 2.5" interior diameter, with a variety of free lengths and spring rates. A number of domestic and foreign manufacturers make race springs, since these are fairly "standard" for many racing applications.

 

do a search on a thread by pomanferrari - here and in 3rd gen section. he tried a bunch of different rates. overall he wasn't too happy with the setup for street driving. coilovers in general can be a bit harsh for street driving due to the stiffer non-progressive spring and metal upper struct/shock tower bushings (aka pillowballs) being steel rather than nice absorbant rubber.

 

Hi Cym I run the set up you are speaking of. I have had no problems with the GC setup. I am going to heaver springs as you well know.

With the GC you can change spring rates very easily. You can start with the 600/450 setup, good for autox but may be stiff for street. However you will never know until you try them. You can run the springs and go soft on the bump and may we ok. If you want softer $50 apiece and you can go softer.

Allan