11-25-2016, 10:24 AM | #23 | |
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11-25-2016, 03:22 PM | #24 | |
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At first they were not doing the diff and subframe bolts and then BMW put out a newer notice to do the bolts too. I wonder how many people had it fixed before the second notice. |
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11-25-2016, 06:50 PM | #26 | |
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Listen to this man.
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11-25-2016, 08:11 PM | #27 |
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11-25-2016, 10:34 PM | #28 | ||
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On M2 forum, final consensus is this is not the diff noise . Instead, it's related to the rocks stuck between the heat shields and disks. However, I keep hearing this exact noise despite flexing the heat shield by hand to get rid of any possible rocks. I would really appreciate if someone can elaborate on this. |
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11-26-2016, 12:37 AM | #29 | |
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11-26-2016, 12:39 AM | #30 | |
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2. I’m not an (EXPERT) I’m just here with an opinion. So don’t hate me. (lukej) |
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11-26-2016, 07:52 AM | #31 | |
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I went through the traditional list of items listed above and it was NONE of those (even though they are the most likely culprits). The dealership replaced everything, and I mean everything. They went through 8 new rims, 12 new tires, replacement of front brake rotors, replacement of steering rack, replacement of steering wheel (twice), replacement of front suspension, replacement of two carbon fibre driveshafts. The list went on and on. [SIDE NOTE: I got extremely lucky in being able to replace all those parts in a relatively short amount of time as there were several dozen M3/M4 cars shipped to Canada that had to be crushed due to extreme snow exposure. I just happened to have my vehicle serviced at the same dealership that was holding those to-be-crushed vehicles, and they could use these cars for donor parts.] They ended up have a BMW tech come from Germany to take a look at the vehicle as they had exhausted all their options. They placed vibration sensors all over various parts of the car to try and determine the source of the vibration. They opened up a PUMA case for this issue. They told me that they had only come across one such other case, but the investigation didn't go too far as the client ended up selling the car. One thing that did make it "better" (but not perfect) was adjusting the "settings" on the driveshaft. I don't know what that means, but the tech explained that there is a mechanical setting that can be adjusted on the driveshaft to try and cancel out any vibration. For me, we tried it on all three settings using two different driveshafts. Adjusting it would improve things, but not fully eliminate the vibration. The eventual cause of issue turned to be (I believe) a piece that connected the driveshaft to the differential. Or at least that was what was explained to me. After they replaced that part, the car drove perfect. The shop foreman said that this was the most difficult vibration case he had ever had to deal with. But he was absolutely fantastic in working with me and listening to my input/feedback as they tried all the various adjustments. Anyways, my point is, that if you have exhausted all of the traditional methods of vibration (wheels, tires, etc.) it is possible that it could be related to the driveshaft/differential. |
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11-26-2016, 08:53 AM | #32 | |
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11-26-2016, 09:54 AM | #33 | |
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11-28-2016, 10:02 AM | #34 |
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The diff alone was causing vibrations up front?
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11-28-2016, 02:44 PM | #35 | |
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Last edited by 09carreras; 11-29-2016 at 08:13 AM.. |
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11-28-2016, 02:51 PM | #36 | |
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Last edited by 09carreras; 11-29-2016 at 08:14 AM.. |
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11-29-2016, 08:19 AM | #37 |
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I am on the recall list and I do get that tin-can scraping sound (but only once in a blue moon). as i understand it, there is no driveability issues, so i am hesitant to bring my car in for the new rear diff after hearing all these horror stories (not just here but from 2 people i know personally).
also, i am not sure given the upcoming winter weather that now is the best time to break in a new diff. i did a damn good job in june of beating the car up the first 1,200 miles and subjecting it to various twists and turns at varying speeds. not sure i could do the same now. any comments or advice would be appreciated.
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11-29-2016, 08:52 AM | #38 |
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A few things to add here:
You can feel a vibration in your steering wheel AND THE REST OF THE CAR and it come from the rear axle, or driveshaft, etc. But if your vibration is PREDOMINANTLY in the steering wheel and much less noticeable in other parts (i.e. gear shift), then it is a front axle problem. A diff replacement is "simple" in the sense that it's not a complex job. However, it is not difficult to mess up the delicate balance of 3 rotating assemblies going out from the diff - the driveshaft side or the 2 axles. So while perhaps the new diff is causing the vibration issue, it could also simply be an installation issue causing a balancing problem at 60-70mph resulting in notable vibration emerging at those speeds. It is very unusual to have a diff-related internal issue that only emerges within a narrow band of speed. That's a balancing issue and unless the diff itself is faulty, the more likely culprits to emerge in a balancing issue are on the driveshaft side. ... Small anecdote: I had a 2007 vw touareg v10 twin turbo diesel. Under an extended warranty, but at ~120k miles, one turbo failed which required the entire engine be dropped out of the bottom of the car in order to replace. These are not common VW vehicles, so expertise is limited. The dealership I took it too fucked up the perfect driveshaft during the R&R and said it was faulty when I COULDNT leave the parking lot because it was knocking against the chassis so hard by 5mph. They tried to deliver it back to me that way. I then located a 2nd (again, rare) driveshaft, drove 250 miles to get it, brought it back, and had them re-install it. A BRAND NEW driveshaft from VW. Immediately after leaving the dealership, when under heavy throttle, the driveshaft would knock into the center tunnel of the car. My point behind all this is even with brand new parts, installation is crucial and it is very easy to screw up a mounting bushing or U-joint and not even realize it, resulting in various issues. |
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11-29-2016, 09:02 AM | #39 |
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Frankly my whole car felt like it was going to fall apart above 6k RPM with the original diff. I complained about this to CaryTheLabelGuy a few times asking if it was my motor having issues. Once the diff was fixed (the only thing they touched) it was all remedied and the car is now smooth as butter to redline.
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11-30-2016, 02:22 PM | #40 |
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Glad now I had mine built back in 2014 with all the issues there having lately. Most bugs are in the 1st production line. looks like its happening later in this model.
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11-30-2016, 02:25 PM | #41 |
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Pleasantly surprised too - and we have the magnesium oil pans, which everyone knows makes us faster.
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11-30-2016, 08:46 PM | #42 | |
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She's going into the dealership next Tuesday, so we'll see what the diff fluid looks like and go from there. |
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12-02-2016, 07:45 AM | #43 | |
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