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Old 09-22-2012, 03:12 PM   #62
TerraPhantm
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Join Date: Feb 2008
Location: Mountain Top
Posts: 5,899
My Ride: 2005 M3 Coupe
Quote:
Originally Posted by SeanC View Post
If there is a single ratio for the non-ZHP and the ZHP, why is there two part numbers for the steering rack (-650 for the ZHP and -651 for the non-ZHP, see pictures in the thread I linked)?
650 is what came on the cars from the factory. 651 is what is available as a replacement. 651 corresponds to a rebuilt part; BMW doesn't sell brand new steering racks, so the part number won't be the same as what's found on the factory.

I've seen plenty of non-ZHPs parting out the 650 rack.

The zhp does have a different steering feel. It's not the rack though. The control arm is likely the main contributor to the better feel. It is also possible that the ZHPs came with the LUK 20 instead of the LUK30.
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