Just been out for a spirited drive and noticed that when I change down from 3rd to 2nd at 60mph I get can feel a vibration. Its like when you go over tramlines on the motorway. I dont think I have ever gone from 3rd to 2nd at that speed before and realise it may not be the best thing to do as that 60 mph is almost at the limiter in 2nd.
changing from 3rd to 2nd at 60mph
- Thread starter ChillZ4
- Start date
ChillZ4 said:
Have you taken it back out? Shift ok? Maybe I baby mine a bit too much, but I'd never go below 4th at that speed. I hope you didn't bugger a synchro. At least you have a 3.0--they can rebuild the tranny, but last I heard, BMW replaces M trannies. Maybe some of the others will chime in on if you need to change the fluid or anything else.
I'll bet then that the vibration was caused the clutch slipping as it tried to spin up the revs on the engine. You may have also set up some kind of resonance in the drive line. Probably no major harm done, but it goes without saying to keep a close watch for any new and unusual noises or vibrations.
Why would you do it :idunno:
Sounds like a mixture of the clutch or gearbox struggling to cope with the effort of the manoevre and/or the rear tyres locking momentarily and skipping over the tarmac. You probably haven't done any real damage this time, but do it again and you might end up with a large bill. If you're going to hammer it about like that regularly, just learn to be a little more mechanically symathetic, you won't be any slower, honest,and learn to heel & toe to match the revs of the downchange.Sounds like you are driving the Z like it is meant to be driven, fast, good for you, just be more gentle with her. 
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