Power difference

[X53Jay4.8is]

Originally Posted by Raul_X5

Hello, I have a question, I have a x5 2002 3.0i, a few days ago drove another x5 2005 3.0i runs much lighter, accelerates faster than mine, mine has 20" rims and my mother has 17" rims. Running 55 miles and accelerate, X5 my mother to accelerate faster than my x5. Any ideas?? The X5 don't have any modification, no check engine light.

I am thinking maybe vanos are not working correctly, maybe the fan clutch, i don't know. spark plug are laser platinum 3199

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.