E28 - Suspention & Steering
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Introduction

The E28s have a relatively weak front suspension. Front suspension bushings wear away quickly and cause shimmying and other handling maladies.

Rotors warp easily, and tie rods wear away as well.

Steering boxes aren't the most precise things either, but you can always adjust them, if out of adjustment.

Upgraded 750 upper control arm bushings are a good idea, as are E34 aluminum lower control arms to reduce unsprung weight.

The rear suspension wears at the subframe bushings and the pitman arms. These will cause oversteer or generally loose handling.

The good news is that there are many modifications available for the E28s in the suspension department. Dinan, Alpina and Hartge all have good suspension systems available and are very well tuned. H&R, Racing Dynamics, Eibach, and Bavarian Autosport all have springs, and you can fit Boges, Bilsteins, or Konis. Of course some combinations work better than others. And you always have the M-tech springs and Bilstein option.

 

Differences in suspention and Steering m535i & ///M5

M535i M5
  • Brakes:
    • Front
      • Vented front rotors
      • 284 mm in diameter (11.2 inch)
      • Calipers ?two?-piston
    • Rear
      • Solid rear rotors
      • 284 mm in diameter (11.2 inch)
      • Calipers xx-piston
  • Anti Roll-bar = 19mm (front) & 15,5mm (rear)
  • Shocks = Bilstein
  • Steering Box (Ball steering rack) = Ratio of 15:1 (E28 535i, m535i, E28 M5)
  • ABS = Standard
  • Factory Wheels = Metric-sized M-Technic (165mm x 390mm)
  • Factory Tires = 220/55VR390 Michelin TRX
  • Brakes:
    • Front
      • Vented front rotors
      • 300mm in diameter (11.8 inch)
      • Calipers four-piston
    • Rear
      • Solid rear rotors
      • 284mm in diameter (11.2 inch)
      • Calipers xx-piston
  • Anti Roll-bar = 25mm (front) & 18mm (rear)
  • Shocks = Specially-tuned Bilstein
  • Steering Box (Ball steering rack) = Ratio of 15:1 (E28 535i, m535i, E28 M5)
  • ABS = Standard
  • Factory Wheels = Metric-sized - (195mm x 390mm) (later 7.5 x 16-inch cross-spoke alloy wheels)
  • Factory Tires = 220/55VR390 (later 225/50VR16 (usually Pirelli P700s))

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Front

Suspension

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Steering

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