Official GC coilover conversion kit - Spec E30


This is the official Spec E30 legal Ground Control coilover conversion kit for the NASA Spec E30 class. Featuring a fixed rate front and rear spring (525lb/in and 700lb/in), and a standardized height adjuster front and rear. Conversions are built to function with Spec E30 camber plates or stock front strut mounts. H&R race springs are still legal for the 2018-2020 seasons.

Spring Kit - This spring kit gives you the option to customize the ride height of your vehicle. After several years of use in racing applications, Ground Control spring kits have been adapted for street use. Most other spring kits offer only one set ride height when installed. The Ground Control system's unique design allows for easy adjustment. Simply lift the corner(s) of the vehicle that you wish to adjust and spin the adjustable spring seat up or down to raise or lower the vehicle*. This spring kit is designed to be used with Bilstein HD or sport shocks. 

Adjusters - All adjusters consist of a threaded sleeve and adjustable spring seat. And are made using high strength 6061-T6 aluminum; anodized for greater durability and appearance. The threads on the adjusters are square cut which locks the adjustable spring seat in place under load. For further precaution, a setscrew in the adjustable spring seat can be used to secure adjustment. Upper spring perches are used to insulate the spring. 

  • Removal of stock spring seat and welding optional for added tire clearance and range of adjustment. 
  • Expected ride height change from 0 to 2.2 inches. 
  • Kit includes everything you need to convert all four corners using your existing Bilstein shocks.
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