PART NUMBER: 61-2976
Coilover conversion kit by Ground Control for Koni or Bilstein shocks. Select the shocks you have in the drop-down menu above.
Adjustable coil-overs allow easy adjustment of ride height and the ability to adjust the weight at each corner. With this simple sleeve design, any shock can now be a race ready coil-over.
Ride height is adjustable from stock to 2 inches lower and more. All aluminum CNC manufacturing makes for light weight parts with smooth and precise adjustment. Performance shocks are recommended...such as our standard Koni Sport shocks.
- Ground Control's standard kit for the Miata is 375 lb/in front, and 250 lb/in rear. Works well on both Koni Sport and Bilstein factory sport package shocks.
- Option of 550/350 spring rates is for hardcore CSP and other race classes. Though some people do it, we consider this TOO MUCH spring rate for standard off-the-shelf Koni Sport shocks. You can either use the Koni RACE shocks or have your Koni Sports or Bilsteins revalved for the purpose
- Highest spring rate option of 700/400 is for hardcore track use with race tires. Unlike 550/350 which is borderline, this is FAR TOO MUCH spring rate than Koni Sports or Bilsteins can handle. Again, best pairing is with Koni RACE shocks, or have your Koni Sports or Bilsteins revalved appropriately.
- We can do CUSTOM spring rates on request! Ground Control is Eibach's West Coast distributor, so springs can be had in just about any rate in 25 in/lb increments. If you want a different spring rate than the above standard choices, include a note in the order comments during checkout stating what spring rates you want front and rear (and it doesn't matter which spring rates you pick in the drop down menu. Price is the same for all spring rates).
Includes all four sleeves, perches, and four springs.
BRIAN'S APPLICATION NOTES: I daily drove the 375/250 combo for many years. That combo was designed for the dual purpose Miata user, somebody driving their Miata to work and then racing it on the weekend. It's a compromise between full race setups like 700 pounds front, and the stock rates that are well under 200 front. It's a racing combo you can drive every day without getting beat up. Front spring is 6 inches long, rear is 7 inches.
I needed to do something about springs and shocks. On the stock setup, with about 60,000 mi, the car was unpredictable, bouncing around and crashing against the bump stops. After reading Brian's description, I decided to give this kit, along with Koni yellows and sport bump stops, a try. I am very happy that I did. It no longer bounces around, has never hit the bump stops, and handles incredibly well. It is definitely more sporty and connected to the road than before, but not harsh at all. With the adjustability of the Konis, I am able to dial the handling to my taste.
I would recommend this setup to anyone who drives their Miata like a sports car. Thanks for the heads up on this one Brian!