E92 pulls to right only under acceleration

waybar17 · 06-21-2011, 01:02 PM

Hi, I've got a 3.0TD 2007 E92.

When driving at 60mph on cruise the car tracks perfectly straight, but when I put the power down (402lbft torque) the car changes lane to the right. Ease off the power and it track perfectly straight again. It's done 74k miles.

I'm assuming this is a weak bush on left rear. Can anyone suggest which one to replace?

thanks

waybar17 · 06-21-2011, 02:57 PM

On the rear tyres, one has 2mm tread and the other has 6mm tread - could that make a difference? I've read on one forum that the 2mm tread won't get as much 'purchase' on the road and therefore the car pulls to one side. This maybe the case because it always seem to pull to the right worse on wet roads than dry roads.

Can anyone verify this?

FVM3 · 06-21-2011, 03:04 PM

get 4 identical tires and get them balanced

waybar17 · 06-21-2011, 03:08 PM

The front 2 are brand new this month, but reluctant to replace an almost new rear just to match both rears at £310 ($503) each for OEM tyres - especially if I don't know for certain that this will fix it.

IancoleTX · 06-21-2011, 03:27 PM

Torque steer. Common with the FWD diesel models.

waybar17 · 06-21-2011, 03:33 PM

FWD models? they are all RWD

fdriller9 · 06-21-2011, 04:08 PM

Check tire pressures.

J02 335i · 06-21-2011, 07:42 PM

Quote:

Originally Posted by *********

Check tire pressures.

+1 I'm will to bet your drivers side rear tire is low.

jopa489 · 06-21-2011, 08:45 PM

Quote:

Originally Posted by IancoleTX

Torque steer. Common with the FWD diesel models.

FWD? You're on E90Post...

I would start by checking tire pressures too.

waybar17 · 06-22-2011, 03:06 AM

The tyre pressures are spot on, I check them regularly. Sounds like tyres are a favourite though, so I'll get both rears replaced and see how we go. I'll update afterwards.

garage queen 335is · 06-22-2011, 05:26 AM

Control arm bushing in the rear suspension!

username604 · 06-22-2011, 06:38 AM

I'm sorry but this seems painfully obvious...
OP has different diameter wheels in the back (thanks to one tire having 6mm of tread and the other only 2mm)
When OP steps on the gas, the weight of the car transfers to the back, causing the uneven wheel diameters to be pronounced.

waybar17 · 07-08-2011, 04:28 PM

Quick update guys; I replaced both rear tyres yesterday and the problem is now completely gone. Good result!!!

So yep, probably a combination of less grip on 2mm tyre and/or smaller wheel circumference. 4mm difference x2 = 8mm diameter difference x 3.14159 = 25mm or 1 inch difference per revolution.

SomeRandomer123 · 07-08-2011, 06:14 PM

Quote:

Originally Posted by waybar17

Quick update guys; I replaced both rear tyres yesterday and the problem is now completely gone. Good result!!!

So yep, probably a combination of less grip on 2mm tyre and/or smaller wheel circumference. 4mm difference x2 = 8mm diameter difference x 3.14159 = 25mm or 1 inch difference per revolution.

Woo hoo!

jopa489 · 07-08-2011, 06:40 PM

Quote:

Originally Posted by waybar17

Quick update guys; I replaced both rear tyres yesterday and the problem is now completely gone. Good result!!!

So yep, probably a combination of less grip on 2mm tyre and/or smaller wheel circumference. 4mm difference x2 = 8mm diameter difference x 3.14159 = 25mm or 1 inch difference per revolution.

That's very significant. Glad you got it fixed though!

06-21-2011, 01:02 PM	#1
waybar17 Private 10 Rep 55 Posts Drives: E93M3, F10 M5, E70X5, F11 Join Date: May 2007 Location: Doncaster, UK iTrader: (0) Garage List 2000 Westfield SEiW [0.00] 2013 BMW F11 520d [0.00] 2012 BMW E70 X5 [0.00] 2010 BMW E93 M3 [0.00] 2012 BMW F10 M5 [0.00]	E92 pulls to right only under acceleration Hi, I've got a 3.0TD 2007 E92. When driving at 60mph on cruise the car tracks perfectly straight, but when I put the power down (402lbft torque) the car changes lane to the right. Ease off the power and it track perfectly straight again. It's done 74k miles. I'm assuming this is a weak bush on left rear. Can anyone suggest which one to replace? thanks __________________ E93 M3 F10 M5 Westfield Carbon E70 X5 F11
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06-21-2011, 02:57 PM	#2
waybar17 Private 10 Rep 55 Posts Drives: E93M3, F10 M5, E70X5, F11 Join Date: May 2007 Location: Doncaster, UK iTrader: (0) Garage List 2000 Westfield SEiW [0.00] 2013 BMW F11 520d [0.00] 2012 BMW E70 X5 [0.00] 2010 BMW E93 M3 [0.00] 2012 BMW F10 M5 [0.00]	On the rear tyres, one has 2mm tread and the other has 6mm tread - could that make a difference? I've read on one forum that the 2mm tread won't get as much 'purchase' on the road and therefore the car pulls to one side. This maybe the case because it always seem to pull to the right worse on wet roads than dry roads. Can anyone verify this? __________________ E93 M3 F10 M5 Westfield Carbon E70 X5 F11
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06-21-2011, 03:04 PM	#3
FVM3 Major General 273 Rep 5,751 Posts Drives: e92 m3, f30 328i Join Date: Sep 2010 Location: Los Angeles iTrader: (2)	get 4 identical tires and get them balanced
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06-21-2011, 03:08 PM	#4
waybar17 Private 10 Rep 55 Posts Drives: E93M3, F10 M5, E70X5, F11 Join Date: May 2007 Location: Doncaster, UK iTrader: (0) Garage List 2000 Westfield SEiW [0.00] 2013 BMW F11 520d [0.00] 2012 BMW E70 X5 [0.00] 2010 BMW E93 M3 [0.00] 2012 BMW F10 M5 [0.00]	The front 2 are brand new this month, but reluctant to replace an almost new rear just to match both rears at £310 ($503) each for OEM tyres - especially if I don't know for certain that this will fix it. __________________ E93 M3 F10 M5 Westfield Carbon E70 X5 F11
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06-21-2011, 03:27 PM	#5
IancoleTX Dillo boxers 272 Rep 3,360 Posts Drives: 2019 M5C Join Date: Jan 2010 Location: USA iTrader: (14)	Torque steer. Common with the FWD diesel models. __________________ 2019 M5C Matte MBB / Tartufo
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06-21-2011, 03:33 PM	#6
waybar17 Private 10 Rep 55 Posts Drives: E93M3, F10 M5, E70X5, F11 Join Date: May 2007 Location: Doncaster, UK iTrader: (0) Garage List 2000 Westfield SEiW [0.00] 2013 BMW F11 520d [0.00] 2012 BMW E70 X5 [0.00] 2010 BMW E93 M3 [0.00] 2012 BMW F10 M5 [0.00]	FWD models? they are all RWD __________________ E93 M3 F10 M5 Westfield Carbon E70 X5 F11
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06-21-2011, 04:08 PM	#7
fdriller9 Banned 253 Rep 7,089 Posts Drives: '06 AW 330xi Join Date: Mar 2009 Location: North Jersey/Philly/NYC iTrader: (4) Garage List 2006 330xi [6.44]	Check tire pressures.
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06-22-2011, 03:06 AM	#10
waybar17 Private 10 Rep 55 Posts Drives: E93M3, F10 M5, E70X5, F11 Join Date: May 2007 Location: Doncaster, UK iTrader: (0) Garage List 2000 Westfield SEiW [0.00] 2013 BMW F11 520d [0.00] 2012 BMW E70 X5 [0.00] 2010 BMW E93 M3 [0.00] 2012 BMW F10 M5 [0.00]	The tyre pressures are spot on, I check them regularly. Sounds like tyres are a favourite though, so I'll get both rears replaced and see how we go. I'll update afterwards. __________________ E93 M3 F10 M5 Westfield Carbon E70 X5 F11
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06-22-2011, 05:26 AM	#11
garage queen 335is Private First Class 25 Rep 101 Posts Drives: 2014 I8, 2016 M2, E46 M3 race Join Date: Mar 2010 Location: PA/ LI iTrader: (0)	bushing Control arm bushing in the rear suspension!
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06-22-2011, 06:38 AM	#12
username604 Colonel 124 Rep 2,554 Posts Drives: bmw Join Date: Sep 2010 Location: repair shop iTrader: (0) Garage List 2008 BMW 335i [10.00]	I'm sorry but this seems painfully obvious... OP has different diameter wheels in the back (thanks to one tire having 6mm of tread and the other only 2mm) When OP steps on the gas, the weight of the car transfers to the back, causing the uneven wheel diameters to be pronounced.
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07-08-2011, 04:28 PM	#13
waybar17 Private 10 Rep 55 Posts Drives: E93M3, F10 M5, E70X5, F11 Join Date: May 2007 Location: Doncaster, UK iTrader: (0) Garage List 2000 Westfield SEiW [0.00] 2013 BMW F11 520d [0.00] 2012 BMW E70 X5 [0.00] 2010 BMW E93 M3 [0.00] 2012 BMW F10 M5 [0.00]	Quick update guys; I replaced both rear tyres yesterday and the problem is now completely gone. Good result!!! So yep, probably a combination of less grip on 2mm tyre and/or smaller wheel circumference. 4mm difference x2 = 8mm diameter difference x 3.14159 = 25mm or 1 inch difference per revolution. __________________ E93 M3 F10 M5 Westfield Carbon E70 X5 F11
	Appreciate 0 Quote