MRT Gr.A DTM rear-axle components, BMW E30/Z3/Compact

MRT Gr.A DTM rear-axle components, BMW E30/Z3/Compact

Adjustment and fabrication parts for BMW semi-trailing-arm rear suspension. Select the adjuster kit or DIY component required. Installation involves cutting, welding and accurate alignment.

Adjuster kits

• Double-adjuster design based on 1990–1992 DTM components: 40 mm camber adjustment and 30 mm toe adjustment. Camber can be adjusted quickly from below, with a spherical inner-joint conversion.
• The horizontal kit works with original subframe pickup points and trailing arms. An A-brace reinforcement is required, and the body may need notching above the adjuster.
• The vertical kit requires modified subframe pickup points. Three pairs of different-height rod-end spacers allow rear roll-centre and load-transfer adjustment. It is not for original trailing-arm geometry.

DIY fabrication components

• Narrow-sweep pickup points and inner reinforcements reduce alignment changes during travel. Use with the vertical MRT-20007-4V kit and purpose-built trailing arms. Outer pickup points can be connected to the roll cage.
• Solid subframe bushes convert the body mounting to the DTM-style arrangement.
• Sway-bar mounts and exhaust brackets require the raised centre section and a purpose-built DTM-style anti-roll bar.
• The raised centre section lifts the differential cradle by 30 mm and requires substantial fabrication.

Fitment, materials and installation

BMW E30, E30 M3, Z3, Z3 M and E36 Compact. Other similar semi-trailing-arm systems may be adaptable with modifications.

Zinc-plated CrMo adjuster components, high-strength structural-steel weld-in parts and 304 stainless-steel spacers. MRT decals are included.

Remove the trailing arms. Both inner and outer ends require cutting and welding. Use a purpose-built jig or the manufacturer’s cutting templates.

Product options

Option 1: Package.

Installation instructions and drawings

• MRT-20007-4H Instructions, PDF
• MRT-20007-4H Assembly drawing, PDF
• Subframe components Assembly drawing, PDF