05-30-2018, 04:14 PM | #1 |
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Grinding/Vibration in Between Gears 6MT
Hello Everyone,
My car, a 2016 M235i 6MT, recently developed a strange issue in between high rpm (>5000) gear changes. Originally I thought I was having the same issue that people were reporting in this thread. https://www.2addicts.com/forums/show....php?t=1008811 . A quick summary is: A grind going into 2nd with moderate throttle while shifting at higher rpms. There were a few other members that expressed similar conditions and also had transmissions replaced. My issue is almost identical except for the fact that it will vibrate audibly the second I clutch-in before even trying to go into 2nd. I also get a lot of the same feedback through the shifter and the clutch pedal. It will continue to vibrate even if I keep the gear selector in first and just let the rpms drop while clutched in. If I do actually shift into 2nd there is more of a harsh grind that I can feel and hear as well. It will also do the same exact thing during a 2nd to 3rd shift. Not sure about 3rd to 4th because I would have to be going pretty quick to test it out. To map it out and hopefully be less confusing, here is a sequence of events. -Quick/moderate acceleration in 1st to 5000rpms -Clutch in *vibration starts -Keep gear selector in 1st and clutch in, vibration continues until rpms drop OR -Shift into second *audible grind -Clutch in *Now in second, everything feels normal This is all at operation temp while driving normally, not slow, but also not banging gears in full boost. From what I've gathered from the other thread and from my general knowledge, the clutch-in vibration almost feels like the clutch not releasing fully, and the grind going into gear seems like it could be a result of this added stress on the synchros. This was someone else's theory in the linked thread as well. I called BMW today, but I couldn't really explain that much to the person who answers the phones. I'm waiting for a call from my advisor so I can explain a bit more. I have an appointment in 2 weeks, but hopefully I can go in sooner just to show them the issue. Any feedback would be appreciated. Thanks,
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05-30-2018, 04:39 PM | #3 | |
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I've had cars with bad throwout bearings, so I'm familiar with that sound and feeling. I also wouldn't expect the clutch to be worn to that extent.
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05-30-2018, 04:58 PM | #4 | |
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Am I correct that your noise coincided with clutch pedal movement and not with gear shift lever actuation ? |
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05-30-2018, 05:22 PM | #5 | ||
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05-30-2018, 08:41 PM | #7 |
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The flywheel did cross my mind too
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05-31-2018, 11:33 AM | #8 |
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I'm not sure how much different the N20 6MT is from the N55 but I was having some of those issues at around 58K miles, I'm at 73K now. I no longer have them after switching my transmission fluid from the stock stuff to RedLine DT4. Shifts are much smoother now and there's no shudder like there was before. The 1st to 2nd shift at 5000 and up is like butter in the fact that it's no longer notchy like it was before. I initially thought I was going to be changing the clutch/DMF/PP/TOB but I'm pretty certain I have plenty of miles left till I have to tackle that. I don't drive my car slow, it's my daily, and gets lots of heel/toe action on a regular basis.
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05-31-2018, 11:54 AM | #9 | |
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Drives: 2015 BMW M235i
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05-31-2018, 12:28 PM | #10 | |
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Red Line's MTL 75W80 is another option that has been shown to work in BMWs (and the wife's Mazda 3, too! :-): https://www.redlineoil.com/gear-oil-...-transmissions Last edited by dradernh; 05-31-2018 at 12:34 PM.. |
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05-31-2018, 01:33 PM | #11 | ||
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Drives: 2015 BMW M235i
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05-31-2018, 02:27 PM | #12 |
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I don't really know. The shops I've used for both race BMWs and a street BMW (and a current model Mazda 3) have used one or the other of those fluids. The better of the shops used the MTL in a race E36 M3 and in the Mazda 3's transaxle.
Red Line has a couple of pages that might help answer your question: https://www.redlineoil.com/faq https://www.redlineoil.com/technical-info You can also contact Red Line directly via their online contact form or by phone if you want to speak to a technical person. Red Line is a product line for professionals and for enthusiasts like us, so a phone conversation isn't out of the question. Might as well get it straight from the horse's mouth, right? |
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05-31-2018, 02:52 PM | #13 | |||
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05-31-2018, 03:57 PM | #14 | |
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I have heard of people liking that fluid to smooth things out. In my case I feel like it might be a bigger issue than fluid though. To put it in classy terms, it seems very f*cked up. The vibration is so violent that the whole car feels like it has massaging seats. The grind is so loud that it can definitely be heard by everyone in the car, probably the people in the car next to me too. It makes me cringe. I feel bad for my car. When everything gets resolved I will definitely have the fluid changed to the redline by a reputable indy BMW shop. I would hate to think that the fluid caused it in the first place. BMW still hasn't gotten back to me to let me know if I can bring it by just to show them before my appointment. Until then, slow shifts under 4k rpm.
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06-02-2018, 09:28 AM | #17 | |
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06-02-2018, 11:37 AM | #18 |
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If it grinds it means your transmission's synchro or synchros are damaged. The only real remedy is to replace the transmission, adding Redline will only delay the inevitable. Your clutch and flywheel may also be damaged which warranty doesn't cover (hopefully you won't get screwed on those like I was to the tune of 4800 dollars). Good luck and I hope your dealer/BMW will accommodate you.
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06-02-2018, 11:49 AM | #19 | |
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I'd like to think that if a problem caused the clutch to get damaged that it would be covered as well.
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06-02-2018, 01:28 PM | #20 |
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In my case it most likely caused clutch & flywheel damage (I know how to operate manual transmission car so it wasn't me), however all my explanation and pleading fell on deaf ears so I only ended up with an outrageously inflated bill.
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06-02-2018, 04:08 PM | #21 | |
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My car is under CPO warranty and I upgraded the maintenance as well, so I hope I don't run into these issues. Like you said, I too know how to drive manual well and this isn't my first manual car. Frustrating.
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06-11-2018, 01:25 PM | #22 |
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Grinding/Vibration in Between Gears 6MT
So a little update:
Dropped my car off Thursday and it spent the weekend at the dealer while I was at the Montreal Grand Prix (which was awesome). They claim that it was a malfunctioning clutch assembly. They wouldn't really go into detail on the phone. It's frustrating since 95% of their customers don't know anything about cars, so they assume that I, and others who are into cars don't either. They did tell me that it wasn't replaced for wear, so I'm guessing it was the pressure plate. I'm questioning whether or not they tried to diagnose if there is a actually transmission issue or they are just throwing a clutch at it. We'll see tomorrow. They made it clear that if the issue is still there they will replace more stuff. Good news is my maintenance plan already paid for itself with this clutch.
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