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      08-03-2012, 12:08 AM   #23
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Quote:
Originally Posted by mitch32 View Post
Thanks for the tip, I sent a message to them and included the link to this thread. I guess lets see what happens, I appreciate your advice.
No problem man. Do NOT give up with BMW AG until this is fixed to your satisfaction.

Good luck and keep us informed as to how it is going.
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      08-03-2012, 03:22 AM   #24
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What a shitty stupid situation. Sorry man
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      08-03-2012, 04:24 AM   #25
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OP, which dealership are you speaking of?

If you are hesitant to publicize the dealer's name, please PM it to me!
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      08-03-2012, 07:23 AM   #26
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BTW, what dealer? I am driving to Montreal for a wedding today. If my car breaks down I want to know who to avoid!
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      08-03-2012, 08:47 AM   #27
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Hope you get this resolved

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Son of a gun......That is terrible, terrible customer service.
Yup...BMW scored the WORST of all premium car makers in dealer customer service. Shit...I could have told you that many years ago...didn't take an extensive study to figure that out.

While there are some good dealers...some like to hire dickheads. I've have plenty of stories.
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      08-03-2012, 12:52 PM   #28
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not entirely true. The diff bolts have been discussed at length here before. The problem is the threaded bolts securing the diff shear.
I wouldn't think a burnout to be that bad for the car as the wheels should be spinning. Lateral forces on the car would present more of an issue on the bolts themselves. So standing still, even smoking the tires and giving the driveline and initial shock shouldn't do this.

Maybe if it was at a drag strip going through the box (sticky rubber) or launching the car that I could see, or as said before hard lateral forces on the rear end.

Now where is the guy who was designing new bolts??
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      08-03-2012, 12:54 PM   #29
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Futhermore, I believe the diff acutally broke after the bolts sheared and it hit the ground. THis is what damaged the heat sink on it too. The issue is not in the diff, but how it's secured.


OP your car looks like a good candidate for the corrosion warranty regardless, it looks terrible under there.
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      08-03-2012, 12:56 PM   #30
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Quote:
Originally Posted by m3alabama View Post
"why does bmw make the car with launch control then.."

Well hitting 8400 rpm going 13 miles per hour is not something that could or would ever happen in launch control, or any launch even if you held the revs high and let her rip. This occurs if you are purposely doing a prolonged burnout and even than you should not be hitting 8400 rpms.

The OP did not comment as I suspect he was doing burn outs. There is clear evidence of that and sustained burn outs on a diff is considered abuse.

I am not saying its great and it is really bad luck they denied the claim, but I can't say this is not "fair" and in line with abuse of a part of the car with subsequent damage. A sustained burnout at full throttle is putting tremendous stress on the diff, much more than a simple hard launch even when using launch control.

the lateral forces to the diff bolts are much greater when moving than standing still. The launcing (if hooking up) is where things will break. A good (proper) smoky burnout shouldn't hurt anyhting. (noticed I said proper)
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      08-03-2012, 12:58 PM   #31
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Quote:
Originally Posted by Sean05 View Post
well i guess thats normal then...
Unfortunately it is. I drove my clean California 350z for two winters in Pennsylvania and it ended up looking like that afterwards. And PA winters don't hold a candle to Canada. That's not the problem here though.

Quote:
Originally Posted by talontid View Post
not entirely true. The diff bolts have been discussed at length here before. The problem is the threaded bolts securing the diff shear.
I wouldn't think a burnout to be that bad for the car as the wheels should be spinning. Lateral forces on the car would present more of an issue on the bolts themselves. So standing still, even smoking the tires and giving the driveline and initial shock shouldn't do this.

Maybe if it was at a drag strip going through the box (sticky rubber) or launching the car that I could see, or as said before hard lateral forces on the rear end.

Now where is the guy who was designing new bolts??
A smooth burnout should be fine. It's wheel hop that stresses the fully threaded, single shear bolts (fucking stupid) on the diff and causes them to fail.

That said, some people claim to have had them break with no "hard" driving AT ALL. Bottom line is, there is something wrong here. It scares the hell out of me and makes me not want to drive the car hard.
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      08-03-2012, 02:11 PM   #32
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I thought a forum member was going to design a reenforcment bracket for our diff but haven't heard anything new. I am scare here too as the last time I checked the bolt, they were not tightened up to spec. sucks.
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      08-03-2012, 02:20 PM   #33
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Quote:
Originally Posted by e92zero View Post
I thought a forum member was going to design a reenforcment bracket for our diff but haven't heard anything new. I am scare here too as the last time I checked the bolt, they were not tightened up to spec. sucks.
someone had looked into design a new bolt that wasn't fully threaded of additional hardness; that's what I was inquiring in bold.
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      08-03-2012, 02:48 PM   #34
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I was looking into getting other 10.9 grade bolts that are not fully threaded and see if they are a good replacement. I read about 12.9 grade but some people pointed out that they can actually be more brittle than 10.9 so might not be a good candidate for this application. I think there was a picture on here also that showed where the bolt broke and it's not the head area so not really sure a non fully thread bolt is going to help that much. But I will be ordering some parts soon so I will report back if the bolts I found works or not. There was another member that was looking into designing a bracket also.
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      08-04-2012, 10:44 AM   #35
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id call this guy if i were you... just incase

http://www.m3post.com/forums/showthread.php?t=695227
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      08-04-2012, 02:19 PM   #36
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There's a difference between gears cracking in the diff from abuse and the diff actually falling out of the car. Even if it was burned out improperly, there's no reason for the diff to just completely fall out of the car 2000km later. And, as was stated above, a proper burnout transfers all stress to the tires, and given that OP drags and races a 600hp Skyline, I'm sure he knows how to actually do a burnout without making the diff fall out.
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      08-04-2012, 02:35 PM   #37
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Quote:
Originally Posted by talontid View Post

Now where is the guy who was designing new bolts??
Right here.

Aiming for early Fall 2012 release.

It has taken a little longer than anticipated due to testing and R&D.
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      08-05-2012, 05:34 AM   #38
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How do they even know that the car was going 20 km/h at redline? The car gets its speed from how fast the wheels are moving I believe so I don't see how they could assume that this was a burnout.
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      08-05-2012, 10:19 AM   #39
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I just got an email from BMW Germany asking for information.. I'll update once I get something from them.

I never did a burnout with my m3 mostly because I didn't want to burn my new tires, but I believe that redline at 20km/h happened I believe in the rain while moving forward (nevertheless I'm not 100% sure when it actually happened, but thats the only time I hit redline that I recall).
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      08-05-2012, 10:41 AM   #40
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Quote:
Originally Posted by mitch32 View Post
I just got an email from BMW Germany asking for information.. I'll update once I get something from them.

I never did a burnout with my m3 mostly because I didn't want to burn my new tires, but I believe that redline at 20km/h happened I believe in the rain while moving forward (nevertheless I'm not 100% sure when it actually happened, but thats the only time I hit redline that I recall).
If I remember correctly, there was a thread on here where a forum member blew his SC motor and mentioned something about "over-reving", after sending his ECU data to another member on the boards that person was able to find out when that "over-reving" took place. Maybe it didn't say the exact date but it could have been the milage.

Anyway what I'm trying to say is, if you are 100% positive you never did a burn out then I'm pretty sure you can ask for a print out from your dealer to show when the redlining occurred. If it happened before you owned the car I think that could help you.

Also I just can't see how you could redline in the rain at 20km/h without doing something silly, maybe drifting? Donuts? Power sliding? Or just flooring it first gear with TC off? Maybe I'm retarded and not fully understanding what you were trying to say but I just can't see how you would redline at that speed with out breaking traction, especially in the rain.

Hopefully someone who is more knowledgeable ont his stuff can chime in.
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      08-05-2012, 05:45 PM   #41
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Quote:
Originally Posted by View Post
If I remember correctly, there was a thread on here where a forum member blew his SC motor and mentioned something about "over-reving", after sending his ECU data to another member on the boards that person was able to find out when that "over-reving" took place. Maybe it didn't say the exact date but it could have been the milage.

Anyway what I'm trying to say is, if you are 100% positive you never did a burn out then I'm pretty sure you can ask for a print out from your dealer to show when the redlining occurred. If it happened before you owned the car I think that could help you.

Also I just can't see how you could redline in the rain at 20km/h without doing something silly, maybe drifting? Donuts? Power sliding? Or just flooring it first gear with TC off? Maybe I'm retarded and not fully understanding what you were trying to say but I just can't see how you would redline at that speed with out breaking traction, especially in the rain.

Hopefully someone who is more knowledgeable ont his stuff can chime in.
M-dynamic I think was on (DSC was off in some capacity, either completely or M-dynamic), the tires did spin but there was no 'burnout'. A burnout usually means smoke and on the brakes a bit to make the tires spin and not gain traction. I don't think this single occurance should have caused my diff to literally fall off 2000km later, I could be wrong but I don't think an m3 is made to be that fragile.
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      08-05-2012, 09:14 PM   #42
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Quote:
Originally Posted by m3alabama View Post
M dynamic mode in the rain? Sounds like you were up to something in terms of spinning the tires or drifting for fun. Or you are just stupid which does not sound like it is the case.

Listen man this is total crap BUT you really can't give bmw any excuse to void a warranty and unfortunately this is as much evidence as they need to show clear evidence of redlining the car at a speed 1/4 of what it is supposed to be at redline. Only a burnout (which is not just smoke-it means any spinning of the tires without much forward motion) Usually this produces smoke but in the rain it will not but still a burnout
The speed isn't the issue, the redlining is/was. No matter what it should not be any cause to void a warranty 2000km later especially on the diff. I'm 99% sure (even 100%!!) that everyone who owns an m3 has redlined the car at one point, and if they haven't someone has (a mechanic, friend, wife/husbad, family member, etc...). They scanned the car and they told me thats all they found, and to be honest I'm pretty conservative when I drive the m3 as it was/is my daily driver and 95% of the time I'm in traffic. The only real wear my car should see is clutch and brakes because of the traffic. I've seen way too many cars on this forum with diff issues, and there's also engine bearing issues on 08's but thats another thread not meant for this one.
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      08-05-2012, 09:25 PM   #43
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Quote:
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The speed isn't the issue, the redlining is/was.
Wrong. It's the combination of speed and rpm that they're nailing you on.

That being said I think a lot of M3 drivers would have a data point like this in their logs. Keep us updated on how things go.
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      08-06-2012, 12:45 AM   #44
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wow this is just plain shitty... hope everything works out bro... thats just unfair..
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