Spec X5 Overland Build

[thstone]

Originally Posted by brappp

Can anyone speak on how bad of a hit acceleration took on the 3.0 with the heavier tires?

Acceleration will be impacted from two causes: (1) lower (effective) gearing due to the larger diameter tires; (2) increase in unsprung weight of the tires.

In driving on the street around town, I don't really notice much of a difference in acceleration. I am sure that my X5 accelerates slower than it did with stock tires/wheels, but whatever effect it has isn't really noticeable to me because around town I'm just not accelerating that fast to begin with.

But I do notice it on the freeway when trying to accelerate to pass someone. Accelerating from 70mph to 85mph seems to take longer than before. With that being said, the 3.0 was never very "fast" or "quick" to begin with so having slightly slower than originally kind of slow acceleration isn't an issue for me but I do notice it.

Is the slightly slower acceleration worth two sets of tires/wheels? Not to me. But then I'm not racing around in my X (I have a 911 street car and a real race car for that!) so the slightly slower acceleration isn't an issue for me but I understand that it might be a concern for others.

The bottom line:
Does the X accelerate slower with taller, heavier tires? Yes.
Is it noticeable? Around town, maybe a little but not much; on the freeway, yes.
Is it a big enough problem to look for a fix? No, not to me.