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General E46 Forum
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Old 05-07-2010, 06:01 AM   #1
ac_2007
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Wheel Hop in a 325i

It was tempting, and I finally attempted my first burnout yesterday. The problem is, I experienced TERRIBLE wheel-hop. It felt like I was destroying the car (in a way, all burnouts do) - the gear shifter was bouncing violently, and it was like no other car I've driven before

What could the cause of this be? Unbalanced wheels? I have some exterior weights on them which may cause some issues perhaps
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Old 05-07-2010, 06:07 AM   #2
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Could be something as simple as wrong tire pressure. However, I would check out the subframe for cracks, rear trailing arm bushings, & rear carrier bushings. Did you try it on dry or wet pavement? Chas
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Old 05-07-2010, 06:09 AM   #3
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Could be something as simple as wrong tire pressure. However, I would check out the subframe for cracks, rear trailing arm bushings, & rear carrier bushings. Did you try it on dry or wet pavement? Chas
Dry pavement, just popped the clutch in 1st. She goes, and it probably hurt me more.
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Old 05-07-2010, 06:18 AM   #4
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It was tempting, and I finally attempted my first burnout yesterday. The problem is, I experienced TERRIBLE wheel-hop. It felt like I was destroying the car (in a way, all burnouts do) - the gear shifter was bouncing violently, and it was like no other car I've driven before

What could the cause of this be? Unbalanced wheels? I have some exterior weights on them which may cause some issues perhaps
Man goes to a doctor and said, "Doctor, every time I do this, it hurts." Doctor says, "stop doing that."

Look for leaks on shocks...flat spots on inside of wheel (I don't quite understand how this works, but I know that flat spots can be balanced with weights, but you still feel them). Also, I wonder if an entire wheel can be bent to the point where the inside center is offcenter from center of outside wheel...but that'd certainly bounce your car.

Anyway, if this is your car and your only car and not a dedicated race car, then I've got to say that you can do some damage to your car, or, if not damage, certainly reduce the life of some components by goofing around with it. Look really carefully with good flashlight and check the things Chas mentioned. He knows more than I do, I know, and he's prolly too polite to say anything like, "it's a bmw not a dragster."

Nothing personal...just looking out for your car!

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Old 05-07-2010, 06:23 AM   #5
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Thanks, we all know the consequences of life. However people continue to eat fast-food, drink alcohol, consume drugs, and in my case, occasionally "test out" the car

I never did check the tire pressure, and I'm running Michelen Energy MXV4's (DOT date 2000, meaning they're almost 10 years old). The tires look like they are new, with approx 80% tread still on them.
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Old 05-07-2010, 07:08 AM   #6
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Maybe your rear sub-frame has already torn. If not, just keep doing those burnouts and eventually you may just be able to get it to fail.
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Old 05-07-2010, 07:22 AM   #7
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is the power 325hP
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Old 05-07-2010, 07:28 AM   #8
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Have the shocks and bushings ever been replaced in the car?
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Old 05-07-2010, 07:38 AM   #9
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Have the shocks and bushings ever been replaced in the car?
I dont think so, it only has 75,000km (around 40k miles)

How should I check if anything needs replacing? Diagnostics are pretty expensive around here. I just acquired this car, where could I start looking for frame damage/cracks?

If anyone has pics, I would greatly appreciate it.
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Old 05-07-2010, 07:51 AM   #10
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Did you turn off the DSC??
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Old 05-07-2010, 08:08 AM   #11
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Did you pop the clutch at a high enough rpm? Break the tires loose all the way or don't do it at all. Half assing it will break stuff.
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Old 05-07-2010, 08:56 AM   #12
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lol, I don't think it was half-assed and yea the DSC was off (ASC)
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Old 05-07-2010, 09:07 AM   #13
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Try it from 3500 rpm and see what happens.
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Old 05-07-2010, 09:20 AM   #14
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I dont think so, it only has 75,000km (around 40k miles)

How should I check if anything needs replacing? Diagnostics are pretty expensive around here. I just acquired this car, where could I start looking for frame damage/cracks?

If anyone has pics, I would greatly appreciate it.
If your car has seen bad roads, hard use (cargo/aggressive driving) or winter use the problem could be as simple as worn shocks/bushings.
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Old 05-07-2010, 09:27 AM   #15
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Try it from 3500 rpm and see what happens.
Thanks, however I'll leave that test up to you. Stalling is embarrasing
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