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M2 Technical Topics > N55 Engine / Drivetrain / Exhaust / Bolt-ons / Tuning > Possible transmission damage during downshift into second

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      12-21-2016, 10:10 AM   #1
Harley89
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Possible transmission damage during downshift into second

I was driving in town, in sport plus, slowing down to a stop at a red light. I downshifted from 4th to third with no problem, Autoblip did its job. Shifted from 3rd to 2nd and auto blip did nothing but I realized that too late. I experienced a bit of a violent lunge as the car drastically slowed down. There was a decent bang too, but wasn't very loud. As soon as I experienced the jolt, I slammed the pitch back in.

Everything worked fine after ..1-2-3-4 and back down again.

I plan on mentioning this next week when I go in for break in inspection.

Any experience with this or advise would be great, thanks!
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      12-21-2016, 12:57 PM   #2
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Did it exceed redline?
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      12-21-2016, 05:46 PM   #3
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Originally Posted by Stage IV View Post
Did it exceed redline?
No, it did not rev match at all, I ended up catching it and slamming the clutch before any gain in RPM.
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      12-21-2016, 05:54 PM   #4
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Quote:
Originally Posted by Harley89 View Post
No, it did not rev match at all, I ended up catching it and slamming the clutch before any gain in RPM.
Phew. I was thinking you may have money shifted, possibly causing $20k in non-warranty damages.
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      12-21-2016, 09:32 PM   #5
Harley89
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Quote:
Originally Posted by Stage IV View Post
Quote:
Originally Posted by Harley89 View Post
No, it did not rev match at all, I ended up catching it and slamming the clutch before any gain in RPM.
Phew. I was thinking you may have money shifted, possibly causing $20k in non-warranty damages.
No way!
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      12-22-2016, 09:03 AM   #6
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Listen and feel for any thing different when shifting for the next few days. My e92 m3 tranny's hanging bracket and some bolt broke during a hard shift in the rain and traction control caught it. There was a bang on the undercarriage every time i shifted a few days after that. Bmw honoured the warranty.
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      12-22-2016, 12:44 PM   #7
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Quote:
Originally Posted by UltraMagneticAL View Post
Listen and feel for any thing different when shifting for the next few days. My e92 m3 tranny's hanging bracket and some bolt broke during a hard shift in the rain and traction control caught it. There was a bang on the undercarriage every time i shifted a few days after that. Bmw honoured the warranty.
Will do, thanks!
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