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      11-23-2011, 01:02 PM   #1
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Experienced minor wheel hop: what to check?

I recently experienced some minor wheel hop when going up a parkade ramp. Hop was caused more by the ice -> dry -> ice transitions I think than the overall torque being applied. Still, it was loud and maybe had 3-4 iterations. DSC was on (part of the issue?)

Everything seems fine. Are there any parts I should take a detailed look at? Differential seems unharmed but I'm not sure how else I can check that other than looking for leaks.
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      11-23-2011, 02:13 PM   #2
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      11-23-2011, 02:22 PM   #3
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Har har

Just seems like from other posts on here (example) that this could create a serious issue. Not so with other boards... but anyway.. Apparently hop turns the diff into a faberge egg. Just wanted to check. I did put this under maintenance.
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Last edited by stefan; 11-23-2011 at 02:37 PM.
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      11-23-2011, 04:25 PM   #4
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Wheel hop only becomes a real issue when launching the car or putting alot of power down. If you get wheel hop in those situations back off the throttle immediately, at least thats what I do
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      11-24-2011, 10:37 AM   #5
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I'm curious if I encounter wheel hop when edc is in sport mode
I only had wheel hop in my non edc 08 when it was new
So either when the tires got broken in and had more grip it stopped
Or I just got used to not mashing the throttle
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      11-24-2011, 02:47 PM   #6
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Quote:
Originally Posted by stefan View Post
Are there any parts I should take a detailed look at?
If you want to be at ease, just get under the car (no need to lift it) and check that the 2 differential/subframe bolts that also hold the exhaust brackets are not broken. They shouldn't if it wasn't violent. Good luck.
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      11-24-2011, 02:49 PM   #7
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Quote:
Originally Posted by elp_jc View Post
If you want to be at ease, just get under the car (no need to lift it) and check that the 2 differential/subframe bolts that also hold the exhaust brackets are not broken. They shouldn't if it wasn't violent. Good luck.
Looked OK at the time.. but I'll look again. I might as well check the torque while I'm down there after threads mentioning that they may be on too tight from the factory or otherwise. Would you happen to know the spec for those bolts?
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      11-24-2011, 03:04 PM   #8
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Quote:
Originally Posted by stefan View Post
Would you happen to know the spec for those bolts?
I'm not 100% sure, but it was reported on this forum at 74 ft/lbs, which sounds about right to me. It was also reported (haven't removed them myself, so can't confirm that either) that the ENTIRE area where the bolt goes is threaded, meaning the bolt can be BOTH torqued to 74 ft/lbs AND be broken (sheared off) at the subframe connection at the same time. I refuse to believe BMW would be that stupid to put a threaded differential hole where the bolt head goes on an M car, but I've seen worse . So just push on the differential to make sure it's rigid. Again, the way you described your episode, you should be okay buddy. But checking is always good . Take care.
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      11-24-2011, 03:29 PM   #9
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Quote:
Originally Posted by elp_jc View Post
I'm not 100% sure, but it was reported on this forum at 74 ft/lbs, which sounds about right to me. It was also reported (haven't removed them myself, so can't confirm that either) that the ENTIRE area where the bolt goes is threaded, meaning the bolt can be BOTH torqued to 74 ft/lbs AND be broken (sheared off) at the subframe connection at the same time. I refuse to believe BMW would be that stupid to put a threaded differential hole where the bolt head goes on an M car, but I've seen worse . So just push on the differential to make sure it's rigid. Again, the way you described your episode, you should be okay buddy. But checking is always good . Take care.
Thanks man! Will do.
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      11-24-2011, 05:11 PM   #10
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Quote:
Originally Posted by elp_jc View Post
If you want to be at ease, just get under the car (no need to lift it) and check that the 2 differential/subframe bolts that also hold the exhaust brackets are not broken. They shouldn't if it wasn't violent. Good luck.
Dude no. This post is a prime example of misleading information.

The 2 nuts that mount to the differential ears do NOT support the differential. The 2 large bolts do. Secondly, one minor incident of wheel hop would not cause a bolt to become loose, it is caused by prolonged abuse and axle hop.

Original poster, if you experienced minor wheel hop, you have nothing to worry about. Carry on and enjoy your car.

-Malek
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      11-25-2011, 06:31 PM   #11
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Concur with Malekreza11. Drive it and enjoy it. Minor wheel hop should not even concern you.
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      11-26-2011, 01:37 AM   #12
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Quote:
Originally Posted by Malekreza11 View Post
Dude no. This post is a prime example of misleading information.
This is a prime example of inferior reading skills. Read my post again... dude. Everybody knows by now the nuts do not hold the differential to the subframe, but they're attached to the bolts (an easy reference to know which bolts we're talking about). And everybody also knows a mild incident of wheel hop shouldn't cause any issues, but nothing wrong with checking for piece of mind. Had enough of your grandiose crap; one more to the 'list'.

Last edited by elp_jc; 11-26-2011 at 01:44 AM.
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      12-03-2011, 01:22 AM   #13
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Quote:
Originally Posted by elp_jc View Post
This is a prime example of inferior reading skills. Read my post again... dude. Everybody knows by now the nuts do not hold the differential to the subframe, but they're attached to the bolts (an easy reference to know which bolts we're talking about). And everybody also knows a mild incident of wheel hop shouldn't cause any issues, but nothing wrong with checking for piece of mind. Had enough of your grandiose crap; one more to the 'list'.
LOL

Pretty soon this guy will have everyone on ignore. What a mental case.
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      12-13-2011, 12:15 AM   #14
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So I'm learning a few things on these forums ...

I haven't heard this before, but how serious is the wheel hop? There will be times when I will want to drop the clutch on my 6MT and get out of the hole ASAP. Are all of you telling me that this is not recomended and could seriously harm the M3?

Who would engineer a diff that couldn't take some wheel hop?
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      12-13-2011, 12:48 AM   #15
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Quote:
Originally Posted by Superfly_M3 View Post
So I'm learning a few things on these forums ...

I haven't heard this before, but how serious is the wheel hop? There will be times when I will want to drop the clutch on my 6MT and get out of the hole ASAP. Are all of you telling me that this is not recomended and could seriously harm the M3?

Who would engineer a diff that couldn't take some wheel hop?
If you are launching with massive wheel hop, then no it is not recommended. If you are able to launch with the appropriate technique, tire pressure, conditions, etc. then beat away - the car will take it all day long.

There are some uneven road surfaces that simply cannot be launched on - like ones heavily rutted by trucks braking as an example. People need to be aware of their surroundings and have their car dialed-in if they want to get 100% out of it.
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      12-13-2011, 08:59 AM   #16
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Concrete that's anything less than perfectly smooth and wet uneven asphalt pavement are the two places I get a lot of wheelhop in just about any car. That's what all those number between 0% and 100% throttle are for
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      01-05-2012, 04:13 PM   #17
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Quote:
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Check to make sure you didn't break a nail
Lmao. nice
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