Quote:
Originally Posted by X53Jay4.8is
Does your mothers X5 have a tune on it? Are the final drive ratios of the 2002 the same as the 2005. Oh wait doesn't the 2002 have a 5 speed tranny vs the 2005 running a 6 speed? Gearing ratios make a difference in performance feel.
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All E53 3.0 final drives are 4.10s. That changes with engines (eg 4.4l is 3.94 and so on). So those two vehicles should both have 4.10s.
I would guess its unsprung weight. 17s to 20s without changing outer diameter could be 20lbs per wheel, unless the 20s are made of magnesium.