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More importantly what is your thrust angle? (archive)

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Posted by ROBERT M on August 02, 2001 at 10:19:11:

In Reply to: Help! Toe setting for rear suspension! (Longish) posted by Nivola on August 01, 2001 at 20:46:16:

Usually the result of extra toe is a bad thrust angle. This is a dynamic measurement taking into account the position of all four wheels. What this translates into is what direction does your car want to go when traveling down the road. i.e. when the front wheels are pointed forward does the back want to pull to the right? If your thrust angle is within acceptable limits (according to BMW) then there is no real danger involved with the add. toe. If this is the case then the only real detrimental effects will come with decreased tire life. Even this may be minimal or acceptable to you. What you have most likely done is slightly bent your rear trailing arm(s). This is fairly common and they can even sag over time. If for whatever reason mentioned above if you do want to fix the problem you can always have the trailing arms bent back. This is not a real hard thing for a decent frame shop to do ($300-400). Second option is to replace the trailing arms. They are about $200 a piece + install, I believe. Third option is to buy the Dinan adjustable subframe. It is possible you have bent the subframe on your car as well, but I highly doubt it with only the toe out of adjustment. The nice thing about the Dinan subframe is it allows for rear Camber and Toe adjustment(even with slightly bent trailing arm). The fourth option is to buy those ecentric bushings but they are way expensive.
My first advice would be to get the Forman of the shop to look at the Alignement printout and have him made some judgement calls based upon what you did and the resulting readings. My guess is bent trailing arm though. Good luck, it is really not that bad. I have been there myself.

Robert M

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