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      01-18-2017, 12:33 PM   #62
drwillb
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Drives: e30 M3, e30 M3, e46 M3
Join Date: Aug 2008
Location: northern NJ

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This is a quote from the E92 M3 Training manual, found here:
http://www.bimmerfest.com/pdf/BMW-M3...nformation.pdf

Steering
The design of the rack-and-pinion steering system is the same as the series E92. The average variable overall ratio is 12.5 and hence sports-oriented (16 in the series E92). In the M3, the steering force support is controlled by the MSS60 via the Servotronic valve. A speed dependent characteristic curve is stored in the MSS60 for this purpose. With the MDrive menu option, a second and even more sports oriented characteristic curve can be activated (see the chapter on MDrive).


So, it seems there are two different assist curves for the steering.

Muppet, is there any way for you to find out which one you sourced from the 1M? I would certainly prefer the "more sports oriented" one if given a choice. I had an 09 Z4 35i and the steering was just dead, numb, and totally disconnected unless you pushed the "sport" button. Then there was some feeling in the steering. However, I think that car had full electric PS, which would explain a lot of the numbness. Now I'm wondering If I should just stick with the current rack and hydraulics only?
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2012 135i Mods: air scoops, CP, BMS filter, PS1, N20 TMAP, ADE FMIC, BMW PE, JB4, 1M front body, full M3 suspension
Owned so far: 88 M3 x 2, 95 325is, 95 M3 x 2, 06 Mini Cooper S, 08 335 xi, 09 Z4 35i, 01 M3, 12 135i

Last edited by drwillb; 01-18-2017 at 07:16 PM..