Quote:
Originally Posted by crex
I believe I read the power steering pump in the 1M/M3 provides more boost/assistance at low speeds. The steering would be heavier in the 135i if the M3 steering rack was swapped over and this wasn't accounted for.
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the power steering pumps do differ by part number. However, at the same time this sounds like a servotronic software issue to me, not something mechanical. After all, there is a retrofit part number for servotronic for the 335i...