Pros and Cons of Speed sensitive steering assist v. Engine-Speed sensitive - BMW M5 Forum and M6 Forums

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Old 2nd March 2002, 03:38   #1
Magna
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Pros and Cons of Speed sensitive steering assist v. Engine-Speed sensitive

BMW offers two kinds of steering assist. I read that on the 4.6is X5 there's speed sensitive steering which I think makes more sense since you need assist when the car is going slow. But on other BMW's, the steering assist is engine-speed sensitive. Is engine-speed sensitive easier to manufacture or is easier regarding maintenance?
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Old 2nd March 2002, 03:55   #2
Richard in NC
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Magna;
I would guess that engine speed sensitive steering is easier since that is directly related to the pulley speed of the pump (but somehow oppositely proportional). IE, The faster the engine, the less assist. Car speed sensitive steering would have to get the info from the engine computer to vary the assist. The 540i was engine speed sensitive and I did notice a little increase in effort when downshifting. As good as the 540i was, I always felt the steering was a bit too soft and way to slow for parking lot maneuvers. The M5 feels just right to me for most driving but still lacks feel compared to the M3 or even 528i. I do like the M5 sport mode that makes a big difference in feel that can be appreciated when running the car hard.
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