Scottish Borders
The front end is pure E90 so very different to the E85, the rear is a copy of the E85 with some very minor changes to motion ratio maybe and spring / damper rates..Nice calcs.how similar to the e85/86 is it?
The track difference is offset, not arms
Track goes 1521 → 1562 mm, up 41 mm. But rim offset goes ET47 → ET29, which pushes each wheel 18 mm outboard — 36 mm of the 41 mm right there.
So only about 5 mm comes from anything else. The arm geometry is essentially unchanged between the two cars.
Which means the spring seat sits at the same place on the same arm, swinging about the same pivot. The E85’s rear motion ratio should be close to the E89’s measured 0.670 — probably a shade higher, since the E89’s wheels sit further outboard and a longer lever arm lowers the ratio. Call it 0.68–0.69,
