car won't go straight

raywong · 08-27-2011, 02:03 AM

I have a 2008 right hand drive M3 imported from UK. I put new RE11 tires on it with fresh wheel alignment. The alignment reading was normal but the car has a tendency to pulls left. If I let go my hand going at 100kph, it will take 5 second for the whole car to drift one lane. I brought back to the mechanic, they have measured the wheel base, disassembled the brakes, swap the springs, new bearings, new alignment... There is no improvement. Any suggestion?

persian54 · 08-27-2011, 02:40 AM

RE11s are STICKY tires

if the road is tilted, it'll grip it more and trail to a side

does it do this on ALL roads?

raywong · 08-27-2011, 04:15 AM

it drifts left on road that are tilted left.(5sec/lane) it goes perfectly straight on road that are tilted right.

karussell · 08-27-2011, 04:51 AM

08 will probably need all new bushings in it. did your mechanic check the control arm bushings? they probably give more than when new and messing with your toe when driven but fine when measured statically.

raywong · 08-27-2011, 05:11 AM

yes the mechanic change 2 bushings in the front. but that's it.

speedfan · 08-27-2011, 06:26 AM

tire pressure?

FVM3 · 08-27-2011, 11:23 AM

some of the road in hk are slighty tilted.

Poppin Fresh · 08-27-2011, 12:21 PM

Your car is gay....

Just kidding.

robb7979 · 08-27-2011, 02:51 PM

+1. almost definitely the bushings. I'd have them (or another mechanic) recheck them. Then alignment after.

Quote:

Originally Posted by karussell

08 will probably need all new bushings in it. did your mechanic check the control arm bushings? they probably give more than when new and messing with your toe when driven but fine when measured statically.

JCtx · 08-28-2011, 07:16 PM

The ultra great majority of roads are crowned to evacuate water, PLUS wind (even if you don't feel it) can also push cars a little, so ANY car slightly pulling over one side of the road is not an indication of a problem by any means. And I'm assuming you checked your tire pressures, because uneven ones also contribute to pulling to one side. Even uneven weight distribution (a heavy driver alone) can have an effect.

Only way to find out for sure is to try driving on a deserted (or abandoned) road with a driver and a passenger of roughly the same weight, where you can turn around and drive exactly over the same footprint as before. And tire pressures checked just before the run (I used 35psi all around myself). If car pulls to the same side on BOTH directions, then you might have an issue... but now you'd have to find out where

. Good luck.

Joonsup · 08-29-2011, 11:30 AM

has the car been in an accident before? Since you measured the wheelbase your struts are probably not damaged. What about the front subframe?

08-27-2011, 02:03 AM	#1
raywong Private First Class 42 Rep 132 Posts Drives: E92M3 Join Date: Jun 2011 Location: Hong Kong iTrader: (0)	car won't go straight I have a 2008 right hand drive M3 imported from UK. I put new RE11 tires on it with fresh wheel alignment. The alignment reading was normal but the car has a tendency to pulls left. If I let go my hand going at 100kph, it will take 5 second for the whole car to drift one lane. I brought back to the mechanic, they have measured the wheel base, disassembled the brakes, swap the springs, new bearings, new alignment... There is no improvement. Any suggestion?
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08-27-2011, 02:40 AM	#2
persian54 Lieutenant General 923 Rep 15,818 Posts Drives: M760/G83M4 Join Date: Jun 2009 Location: The Valley, SoCal iTrader: (298)	RE11s are STICKY tires if the road is tilted, it'll grip it more and trail to a side does it do this on ALL roads? __________________ From E93 335i to E89 Z4 to E93 M3/E89 Z4 to E350/SL550
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08-27-2011, 04:15 AM	#3
raywong Private First Class 42 Rep 132 Posts Drives: E92M3 Join Date: Jun 2011 Location: Hong Kong iTrader: (0)	it drifts left on road that are tilted left.(5sec/lane) it goes perfectly straight on road that are tilted right.
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08-27-2011, 04:51 AM	#4
karussell Lieutenant Colonel 353 Rep 1,749 Posts Drives: 4 wheels Join Date: Sep 2009 Location: NorCal iTrader: (1)	08 will probably need all new bushings in it. did your mechanic check the control arm bushings? they probably give more than when new and messing with your toe when driven but fine when measured statically. __________________ "It gave you amazing satisfaction, but anyone who says he loved it is either a liar or he wasn't going fast enough." - Jackie Stewart on racing at the Nurburgring
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08-27-2011, 05:11 AM	#5
raywong Private First Class 42 Rep 132 Posts Drives: E92M3 Join Date: Jun 2011 Location: Hong Kong iTrader: (0)	yes the mechanic change 2 bushings in the front. but that's it.
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08-27-2011, 06:26 AM	#6
speedfan Major 141 Rep 1,108 Posts Drives: BMW Join Date: Dec 2010 Location: HCM City iTrader: (2)	tire pressure? __________________ My e90 Frozen Grey. Dry CF Roof. Vorsteiner Double Sided CF Boot Lid. OSS. BMW Performance Aero Kit. BMW Performance CF Diffuser Cover. BMW Performance CF Trim. Robson Design Steering Wheel. Advan RS. Michelin PSS. H&R Touring Cup Kit. BMW Performance Brakes. Eisenmann Race Rear Muffler. ESS Directflash
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08-27-2011, 11:23 AM	#7
FVM3 Major General 273 Rep 5,751 Posts Drives: e92 m3, f30 328i Join Date: Sep 2010 Location: Los Angeles iTrader: (2)	some of the road in hk are slighty tilted.
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08-27-2011, 12:21 PM	#8
Poppin Fresh Colonel 86 Rep 2,148 Posts Drives: With a sunroof and front plate Join Date: May 2009 Location: Bergen County NJ iTrader: (0)	Your car is gay.... Just kidding. __________________
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08-28-2011, 07:16 PM	#10
JCtx Major General 258 Rep 5,012 Posts Drives: No BMW yet Join Date: May 2008 Location: El Paso TX iTrader: (0)	The ultra great majority of roads are crowned to evacuate water, PLUS wind (even if you don't feel it) can also push cars a little, so ANY car slightly pulling over one side of the road is not an indication of a problem by any means. And I'm assuming you checked your tire pressures, because uneven ones also contribute to pulling to one side. Even uneven weight distribution (a heavy driver alone) can have an effect. Only way to find out for sure is to try driving on a deserted (or abandoned) road with a driver and a passenger of roughly the same weight, where you can turn around and drive exactly over the same footprint as before. And tire pressures checked just before the run (I used 35psi all around myself). If car pulls to the same side on BOTH directions, then you might have an issue... but now you'd have to find out where . Good luck. Last edited by JCtx; 08-29-2011 at 12:00 PM..
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08-29-2011, 11:30 AM	#11
Joonsup Lieutenant General 322 Rep 17,316 Posts Drives: E92 M3, E30 325i Join Date: Sep 2007 Location: Bay Area iTrader: (8) Garage List 2008 BMW M3 [9.50]	has the car been in an accident before? Since you measured the wheelbase your struts are probably not damaged. What about the front subframe?
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