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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Tracking, Autocrossing, Dragstrip, Driving Techniques > Wobbly at about 150mph



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      05-06-2013, 04:00 PM   #1
cleex024
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Wobbly at about 150mph

hey guys just wondering if any of you get a little wobble at about 150mph? Ive been doin some runs to about 150 and it gets a little wobbly...when i got an alignment went with front : -2.2 camber and 0 toe... rear : -1.8 and .05 total toe in.

wanted to go very neutral but i think this might be whats causing the straight line issue.
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      05-07-2013, 02:03 PM   #2
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typically, zero toe will give up some high speed stability for better turn in abilities. but at those speeds, aero (or lack of) can make a big difference also.
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      05-07-2013, 02:10 PM   #3
cleex024
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Quote:
Originally Posted by mike-y View Post
typically, zero toe will give up some high speed stability for better turn in abilities. but at those speeds, aero (or lack of) can make a big difference also.
thanks for responding but i did get an alignment after putting in my rear upper camber arms and got an alignment with a little toe in about .05-.1 front and rear and there is a lot more stability so i guess that is the answer.

BUT after the couple runs to 140 i came to a stop light and accelerated hard and bam my camber arm stripped off and almost crashed...thankfully this didnt happen during my high speed run or i might be dead.

drove home extremely slowly and found out that i only had 1 thread into the tubes lol and it stripped out. gonna wait for longer tubes to retry this lol.
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      05-16-2013, 05:16 PM   #4
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at those speeds anything can make it just a hair squirrelly. I was just at 140 a week and a half ago, and as I turned in I was only about getting the car settled in and straight. 150 is moving.
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      05-16-2013, 05:18 PM   #5
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Quote:
Originally Posted by mike-y View Post
typically, zero toe will give up some high speed stability for better turn in abilities. but at those speeds, aero (or lack of) can make a big difference also.
Aero is huge at those speeds! What have you done to the car in that regard?
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      05-16-2013, 07:05 PM   #6
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Quote:
Originally Posted by infidel335 View Post
Aero is huge at those speeds! What have you done to the car in that regard?
in the aero department. ..guess I gotta look into it... but then again is not likei feel like the car is going to spin on me
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