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Sebring 2014 videos


Evilwheel
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Listening to the video it appears that the driver of the 935 is doing absolutely nothing in the way of blipping the throttle or making any attempt to match revs on downshifts.  The grinding seems to be a symptom and not a cause of the failure.   Our BMW has had the third gear snychro entirely gone for the last three 14 hour races.  If you don't blip, you are not downshifting into third.  I have no intention of fixing the tranny.


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Listening to the video it appears that the driver of the 935 is doing absolutely nothing in the way of blipping the throttle or making any attempt to match revs on downshifts.  The grinding seems to be a symptom and not a cause of the failure.   Our BMW has had the third gear snychro entirely gone for the last three 14 hour races.  If you don't blip, you are not downshifting into third.  I have no intention of fixing the tranny.

 

And that works OK ?   Do you still get that little zippy sound downshifting into third without the synchro now,or is it quiet now that the synchro is gone.   That is our cars Achilles heal in the drive train.  Not that I'm ever going to do that, just curious mostly. 

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So, are you saying you do NOT heel and toe on downshifts? The Flis brothers out of Daytona (Spirit of Daytona Racing) ran those cars back in the '90's in the Firestone Firehawk series, and I can't ever remember them having trans problems.

 

Yes, I personally do and do it rather well.   And thanks for the info, I'm going to see if I might be able to contact those guys for some tips !  Can't hurt to see if they are still hanging around Daytona somewhere.

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I always heel-toe downshifts under brakes with a full clutch release in neutral timed with throttle blip then a rev matching throttle position (as close as possible) upon release of the second full clutch (during which the shift occurs).  When done correctly there is no bark at all even with a worn-out syncro situation such as third gear in the BMW and this type of shift saves snychros from working and wearing out.  If not timed properly the gearbox will remind you with a gear bark sent through the shifter to your hand which usually leaves the car in neutral and forces you to do the downshift again.   The other drivers know this technique or they would be asked not to drive.


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