Power difference

Raul_X5 · #1 10-02-2016, 01:08 AM

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

g300d · #2 10-02-2016, 02:14 AM

The bigger wheels are heavier and give you a bit of a sluggish feel all by themselves.

That may be the difference you are feeling.

PropellerHead · #3 10-03-2016, 08:36 AM

Quote:

Originally Posted by g300d

The bigger wheels are heavier and give you a bit of a sluggish feel all by themselves.

That may be the difference you are feeling.

+1

I had the exact same experience swapping between OEM 20" and OEM 18" on my '04 3.0. The same thing happened on the '04 4.8is with non-OE 20" (heavier) and OE 20".

Raul_X5 · #4 10-03-2016, 10:06 AM

Quote:

Originally Posted by PropellerHead

+1

I had the exact same experience swapping between OEM 20" and OEM 18" on my '04 3.0. The same thing happened on the '04 4.8is with non-OE 20" (heavier) and OE 20".

I have 20" no oem,

lo_jack · #5 10-03-2016, 10:30 AM

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.

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.

Awntchi · #6 10-02-2016, 04:54 AM

Bigger wheels definately play a role in this. When was the last service and what was changed?

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O3X5 · #7 10-02-2016, 09:36 AM

the wheels of course

ylwjacket · #8 10-02-2016, 09:41 AM

I'd check the air filter also if that hasn't been changed in awhile. I recently did that, and the change is responsiveness was very surprising.

Raul_X5 · #9 10-02-2016, 10:56 PM

Quote:

Originally Posted by ylwjacket

I'd check the air filter also if that hasn't been changed in awhile. I recently did that, and the change is responsiveness was very surprising.

I clean the air filter a month ago, is K&N filter, and change the oil and filter a month ago to.

crystalworks · #10 10-03-2016, 01:24 AM

Quote:

Originally Posted by Raul_X5

I clean the air filter a month ago, is K&N filter, and change the oil and filter a month ago to.

Change back to an OEM style filter, unless you don't mind cleaning your MAF or replacing it if the oil kills the filament. If you over-oil the K&N it can have detrimental effects to the MAF.

Edit: Also, I agree with the others. The wheels are definitely part of your acceleration difference. Switch the wheels temporarily and see how big of a difference if you are really curious.