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      06-07-2011, 06:13 PM   #45
r_seng
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Wow, this is a first for me hearing of something like this happening from BMW. Subbed for more info.
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      06-08-2011, 05:14 AM   #46
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Is it possible that the taper on the wheel bolt seats is different than the angle on the stock bolts? Check to make sure that the head of the bolt seats properly on the wheel.
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      06-08-2011, 11:10 AM   #47
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Had it happen once during the cool down lap. It was the first time I had put my wheels and spacers on and I think I did not get the spacer flush with the hub.

Last edited by ShadeD1; 06-08-2011 at 11:10 AM. Reason: I can't spell :(
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      06-08-2011, 11:12 AM   #48
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If you are using spacers, maybe you need longer lugs?

Quote:
Originally Posted by R A W L S View Post
18x10 et25 square setup

90lbs
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      06-08-2011, 06:25 PM   #49
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Sadly lug bolt and stud failure is not uncommon if you hang out around the track long enough. It has ruined track days for numerous friends over the years. Even a single failure is scary/unsettling. One goes and the rest can follow. I have seen OEM lugs, Extended lugs, and studs fail. That goes from cheap stuff to the best stuff made by ARP.

The reality is that all mounting hardware (OEM included) should be considered a consumable when your driving a car hard like at the track. The parts life cycle just depends on how much abuse it sees. Most amateur racers are replacing their studs every 2 seasons (2 years). Many replace yearly. I've seen regular lugs/studs fail after a few events, but the ones with issues have generally been on the car for a while. Which is why they should be replaced every season or two if you want to avoid a big problem caused by a small part.

I've personally never had a failure of any kind (knock on wood), but I check my torque specs throughout the day, and I avoid over torquing the hardware. I've always used studs on track from day one.

Examples of failure that happened just recently to others:

Use of a 10mm spacer with a chamfered hub extension with a wheel that has no chamfered center bore. This resulted in the wheel floating above the spacer and the mounting hardware was stressed by the bowing of the wheel when bolted down.

stud backing out from not enough locktite or improper stud installation torque spec

Using the same mounting hardware for years, at numerous events and daily driving. (this one happens a lot)

Last edited by Eddy@ApexRaceParts; 06-08-2011 at 07:42 PM. Reason: added more detail
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      06-08-2011, 09:29 PM   #50
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so, all 5 bolts on the same wheel happened to fatigue and fail?
highly unlikely. i suspect improper seating, poor torque, and a wobbly tire that stressed them.
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      06-08-2011, 11:12 PM   #51
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Quote:
Originally Posted by leo95se View Post
so, all 5 bolts on the same wheel happened to fatigue and fail?
highly unlikely. i suspect improper seating, poor torque, and a wobbly tire that stressed them.
Once one goes, they all go...
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      06-09-2011, 05:48 AM   #52
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I don't know if I agree with that, unless bolts are not as good a design as studs. I've driven for months with 4 of 5 installed,(on studs in a pos car) and my wifes passat was missing a stud most of the winter until I found out. Granted not on the track. I think there is an n+1 redundancy somewhat built into the design because of knucklehead drivers...
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      06-09-2011, 06:38 AM   #53
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I just found out that M3Post doesn't have an "ignore" button!
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      06-09-2011, 06:59 AM   #54
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Ouch. Just speaking the truth. You see a lot over time.
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      06-09-2011, 08:57 AM   #55
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I have several users blocked, you have to go the User CP
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      06-09-2011, 10:07 AM   #56
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Thanks guys... Feel the love!
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