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Ground Control - E85/6 Z4M Track School Kit
Ground Control E85 Z4/Z4M Roadster Street/School Kit

Price: $1,849.00

Part Number: 2045.75

Camber Plates:

Front Spring Rates (lb/in):

Rear Spring Rate (lb/in):


Ground Control - E85/6 Track School Kit

Fits BMW E85/6 Z4M Coupe & Roadsters


2 SHORT Koni single adjustable struts in MZ4 specific Ground Control shortened strut housings

  • Notes: This kit is specifically designed for the E85/E86 MZ4. These front struts are completely different from the E36, although they are similar in appearance. Additionally, although the rear is similar to an E46 sedan, the dimensions of the hardware are different. Because Ground Control suspension manufactures our own suspension kits, we are able to make a true suspension kit for the MZ4 rather than adapting E36 and E46 kits.
  • Complete Shortened Front Strut Housing - Machined from seamless DOM 1026 steel alloy tubing. Heavy-duty swaybar bracket welded on. Our design is much stronger and more rigid than any of the aftermarket housings that are actually modified stock housings, with skip-welded gussets and and all original brake line and abs tabs retained.
  • Koni Single Adjustable Front Strut - Struts are externally adjustable from underneath the hood, even with the factory strut brace. This strut is prepared for coil over use, and eliminates machining of critical suspension components. This is a custom valved strut inserts made for ground Control by Koni in Holland, and has a lifetime warranty.
  • Ground Control Threaded Sleeves - This system is designed to eliminate stress risers caused by machining notches into the strut housing. Unlike other companies that claim superiority by cutting threads into a critical component of the suspension, Ground Control uses engineering common sense to maximize the strength of the suspension.
  • Ground Control Adjustable Spring Perch - A unique design, which uses an Allen head bolt to clamp the single threaded perch into the correct position. No secondary pieces are needed to "jam" the threaded perch into position.

2 SHORT Koni single adjustable rear shocks

  • Koni Single Adjustable Rear Shocks - Made in Holland and custom valved to GC specs. Shorter than standard length, with reduced droop length. Preadjusted to match rear spring rates using our shock dyno. Adjusts from inside the trunk with no tools needed. (standard Koni must be removed to adjust).

4 Eibach ERS springs, any spring rate

  • Eibach Springs - Any spring rate is available. Eibach springs are made on German machines both in the USA and in Germany, however all Eibach springs have a lifetime guarantee against sagging, rate change, or any manufacturing or material failure. Lifetime guarantee. Compare!

4 Ground Control bump stops (made in Germany)

  • Ground Control Bump stop - We do not just ask you to reuse your stock bump stops. The stock bump stop is designed for stock suspension; we provide a bump stop designed to work with our suspension. These are soft foam, same quality as OEM BMW parts, but made to our specs in Germany. Our race bump stops are even different than our street bump stops.

2 Rear Ride Height Adjusters

  • Ground Control Rear Ride Height Adjustment Kit - Billet aluminum threaded adjusters bolt on top of the rear control arm. The E46 M has a larger diameter rear axle than the standard Z4, so it is necessary for clearance to not have any portion of the adjuster below the control arm.

1 Pair rear upper shock mounts (urethane)

  • Ground Control Rear Shock Mount - Billet aluminum, urethane bushings, pre-assembled. Includes gaskets and reinforcements. This mount, once installed allows all maintanence to be done without ever removing the carpet or interior due to the extenal bolts, a GC original design.

1 Pair front Camber Plates

  • Ground Control Racing Camber/Caster Plates - More camber adjustment than stock, caster adjustment, aircraft bearings, engraved with calibrated degrees, with stainless steel reinforcement. Every component is anodized or plated, including fasteners. Adds extra travel to avoid excessive bottoming out, this is a very well engineered product. The stainless steel reinforcement prevents electrolysis between the steel fender and the aluminum camber plate.
  • Camber and caster are separately adjustable by sliding the mounts, without removing any components from the car. The priority of this design is to allow fast, repeatable alignment changes at the track.
  • The Ground Control camber plates feature two sets of bearings, a proprietary bearing, made to our specs by Aurora in the USA, which allows for articulation of the shock shaft. This spherical bearing is very understressed, as the Ground Control design does NOT support the weight of the car on the spherical bearing. Instead, the weight of the car is supported by a completely separate articulating needle bearing, which is also manufactured for Ground Control in the USA.

Note: Please specify and/or ask us about custom spring rates during checkout.

Note: Suspension is shipped completely assembled and preadjusted.

Note: All Ground Control products carry a lifetime guarantee against defects when installed and maintained correctly. We strongly recommend that all of our products be installed by a competent, qualified mechanic.

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