Working on my 825i and when I am going down the road I can only go 34-36 mph. The tach is only rev to 5500-5800 rpms. So I figured the belt was worn enough to cause the problem since it has a little over 1400 miles on it. But put the belt on the other night and test rode and it did the same thing. So I jacked up the rear end tonight and started and put in gear and it will rev up to 6400 rpms or so and goes 45 mphs on the jack stands. I have good fuel pressure and no check engine light on.
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