I posted this in the suspension forum but its not getting much action so I'm trying here.

I am planning on doing some autocrossing as well as some closed circuit racing next summer and am tryign to decide on a coilover setup. Right now I am looking at either the M2 Coilover Conversion Kit or the Ground Control coilover kit. With a 400 or 375 front rate and a 325 or 300 rear spring rate.(I'm leaning a little bit towards the GC because it appears that there is a longer threaded portion thus allowing more height adjustability.) And either the Koni or Bilstein shocks.

What are your opinions on these set-up options?

What are you guys running?

 

I have Ground Control which I bought from N-Tech.
Easy to install and adjust. Don't have my spring rates here with me, but they are something like 550F 400R.

 

I autocross on M2's coilovers: GAB Super R shocks with 550 F, 450 R linear springs. The "coilover kit" is made by Ground Control so that probably answers one of your questions, they're the same unless they changed suppliers recently. GAB Super R's are no longer available I think. Couldn't be happer with the setup though.

Alan Cross

 

I thought the stock spring rates were 250 F 200 R. Is 550 F and 450 R to much spring for the car. Just wondering I was thinking of going with 350 F 300 R for autocrossing.

 

550F/450R works fine. I have the M2/Advance Design shocks with these spring rates and do the majority of my driving on the streets of New Orleans (worst streets I've ever seen and I travel a lot - in case no one knows New Orleans is mostly below sea level so the ground sinks and a good street doesn't last long). Car rides better than Racing Beat springs with Tokico shocks. RB springs are 6% stiffer than the stock rates that are about 290F/200R.

This set-up should work fine for autocrossing or road racing. If you road race often M2 recommends 650F/550R.
Jack

 

Has anyone seen the coilovers made by GAB for the FD RX7? I've seen them on a Japanease website, but I can't find it anymore. Someone in NY was selling a set that was imported from Japan and I would like to know if anyone has any experience with these coilovers from GAB, Not GAB shocks with GC or Advance Design threads, REAL GAB coilovers.

 

I also have GAB Super R Struts with 550f / 450r coilovers from M2. I am VERY VERY happy with them.

 

I run the M2/AD coilovers with 550/425 springs, Tri-Point's adjustable front swaybar on Trev's FTL mounts, Eibach rear sway bar, and M2's toe links and trailing arms. So far, I've run this system at Thunderhill and Buttonwillow for driving schools and I love it. Wish I had bought it 4 years ago (of course it wasn't available then

Aside from being able to set corner weights, the M2/AD design is nice because the shocks are double adjustable, with the adjusters on the top of the shocks. This means that you can pop the hood or hatch and try a different setting very quickly. No taking off or reaching around a hot tire in search of some grimy ****. And at the end of the day, you can turn down the compression damping and drive home in (relative) comfort.

They can also be rebuilt (and revalved if you go with significantly different spring rates). These last factors swayed me from going with a non-rebuildable shock and a coilover conversion kit (I understand the GABs cannot be rebuilt). In the end I decided that the extra convenience and maintenance features were worth the few hundred extra $$ (at that time) over a GAB/conversion kit system.

 

I will be running CUSCO Comp2's in 2 weeks. They are the bomb =) go read up on it if u understand japanese.

www.cusco.co.jp