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.

elp_jc · 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 Drives: E92M3 Join Date: Jun 2011 Location: Hong Kong Posts: 126 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 Drives: MW E93 M3/E89 Z4 35i Join Date: Jun 2009 Location: The Valley, SoCal Posts: 15,351 iTrader: (258)	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? __________________ Next track day: http://www.m3post.com/forums/showthread.php?t=651089 Sorry I'm just someone who comes on here to fill a void..I dont have the $ to own a BMW. This is a nice E93:http://www.e90post.com/forums/showthread.php?t=434032

08-27-2011, 04:51 AM	#4
karussell Captain Drives: 4 wheels Join Date: Sep 2009 Location: Germany Posts: 698 iTrader: (0)	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

08-27-2011, 06:26 AM	#6
speedfan Major Drives: BMW Join Date: Dec 2010 Location: HCM City Posts: 1,091 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

08-27-2011, 11:23 AM	#7
FVM3 Brigadier General Drives: 2011 E93 M3 Join Date: Sep 2010 Location: Los Angeles Posts: 4,836 iTrader: (2)	some of the road in hk are slighty tilted. __________________ 2011 E93 DCT

08-27-2011, 04:15 AM	#3
raywong Private First Class Drives: E92M3 Join Date: Jun 2011 Location: Hong Kong Posts: 126 iTrader: (0)	it drifts left on road that are tilted left.(5sec/lane) it goes perfectly straight on road that are tilted right.

08-27-2011, 05:11 AM	#5
raywong Private First Class Drives: E92M3 Join Date: Jun 2011 Location: Hong Kong Posts: 126 iTrader: (0)	yes the mechanic change 2 bushings in the front. but that's it.

08-27-2011, 12:21 PM	#8
Poppin Fresh Colonel Drives: With a sunroof and front plate Join Date: May 2009 Location: Bergen County NJ Posts: 2,044 iTrader: (0)	Your car is gay.... Just kidding. __________________

08-28-2011, 07:16 PM	#10
elp_jc Brigadier General Drives: . Join Date: May 2008 Location: . Posts: 4,912 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 elp_jc; 08-29-2011 at 12:00 PM.

08-29-2011, 11:30 AM	#11
Joonsup Lieutenant General Drives: E92 M3, E30 325i Join Date: Sep 2007 Location: Bay Area Posts: 17,312 iTrader: (8) Garage List 2008 BMW M3 [4.75]	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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