Adventures in Brake Torqueing
06-01-2006, 08:37 AM
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This is my first car with an automatic gearbox and having read about brake torqeuing on this forum I have been trying it out.
I've done a couple of starts with DSC enabled which went great - actually got brief wheelspin immediately followed by a VERY hard start - nice
After reading znods posts in particular about runs with DSC off I thought I would give it a go today.
The roads were lovely and dry so I picked a likely spot and pulled up on a 60mph 'b' road.
I brake torqued to 2000rpm (so I would have all 500nm ready to go) - then lifted off and simultaneously floored the accelerator.
Instead of tearing off into the sunset - my car stayed absolutely still whilst the back wheels span and the RPM needle shot straight up to the red-line and stayed there for 2-3 seconds.
In the end I just eased off the gas and gently pulled away......
Thank god no-one was watching
I've done a couple of starts with DSC enabled which went great - actually got brief wheelspin immediately followed by a VERY hard start - nice
After reading znods posts in particular about runs with DSC off I thought I would give it a go today.
The roads were lovely and dry so I picked a likely spot and pulled up on a 60mph 'b' road.
I brake torqued to 2000rpm (so I would have all 500nm ready to go) - then lifted off and simultaneously floored the accelerator.
Instead of tearing off into the sunset - my car stayed absolutely still whilst the back wheels span and the RPM needle shot straight up to the red-line and stayed there for 2-3 seconds.
In the end I just eased off the gas and gently pulled away......
Thank god no-one was watching
06-01-2006, 08:40 AM
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Originally Posted by needforspeed' post='290982' date='Jun 1 2006, 11:37 AM
This is my first car with an automatic gearbox and having read about brake torqeuing on this forum I have been trying it out.
I've done a couple of starts with DSC enabled which went great - actually got brief wheelspin immediately followed by a VERY hard start - nice
After reading znods posts in particular about runs with DSC off I thought I would give it a go today.
The roads were lovely and dry so I picked a likely spot and pulled up on a 60mph 'b' road.
I brake torqued to 2000rpm (so I would have all 500nm ready to go) - then lifted off and simultaneously floored the accelerator.
Instead of tearing off into the sunset - my car stayed absolutely still whilst the back wheels span and the RPM needle shot straight up to the red-line and stayed there for 2-3 seconds.
In the end I just eased off the gas and gently pulled away......
Thank god no-one was watching
I've done a couple of starts with DSC enabled which went great - actually got brief wheelspin immediately followed by a VERY hard start - nice
After reading znods posts in particular about runs with DSC off I thought I would give it a go today.
The roads were lovely and dry so I picked a likely spot and pulled up on a 60mph 'b' road.
I brake torqued to 2000rpm (so I would have all 500nm ready to go) - then lifted off and simultaneously floored the accelerator.
Instead of tearing off into the sunset - my car stayed absolutely still whilst the back wheels span and the RPM needle shot straight up to the red-line and stayed there for 2-3 seconds.
In the end I just eased off the gas and gently pulled away......
Thank god no-one was watching
06-01-2006, 08:44 AM
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I've been itching to try it myself but haven't found the right conditions yet (ie. no wife and no kids in the car). The other problem I have is finding a suitable road to try it on. Id hate to get a ticket while just having a little fun. :thumbsdown: I bet it was huge adrenaline rush when the car just sat there spinning the tires!
06-01-2006, 09:39 AM
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That's hilarious!
06-01-2006, 11:14 AM
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Originally Posted by Ralph-NL' post='291016' date='Jun 1 2006, 06:42 PM
how bad is this for the clutch to rev up to about 2000RPM while pressing the brakes?
It's equivalent to 'dropping the clutch'
06-01-2006, 11:45 AM
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Good one. I imagine you were pretty impressive. I wish I could have seen the show. Not surprising in a torquemiester like the 535d.
06-01-2006, 11:50 AM
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Originally Posted by Ralph-NL' post='291016' date='Jun 1 2006, 12:42 PM
how bad is this for the clutch to rev up to about 2000RPM while pressing the brakes?
06-02-2006, 01:04 PM
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Originally Posted by Znod' post='291098' date='Jun 1 2006, 03:50 PM
Moderate brake torquing should not hurt at all unless done so repetitively in a short period of time that tranny/converter heat is allowed to go too high. I say "moderate" just to throw in an implied caveat about brake torquing at an "excessivel" level. IMO, brake torquing would only hurt acceleration at such a level anyway.