Wheel Spin
Posted By : Jonathan Reed, 10-May-2006, 09:17pm
All I get is clutch slip !
Wheel Spin
Posted By : Jonathan Binnington, 10-May-2006, 10:00pm
James, with a conventional diff (I presume) dumping the clutch with five and a half showing will only spin up one wheel, stress all mechanical parts
and achieve next to bugger all at SW come sunday. you might even break something.
for cars with conventional diffs your fastest way off the line will be by using the clutch as the slippage item, feed the clutch in to keep the engine revs at max torque (about 4k rpm) and open the throttles to keep the engine speed up as the car moves off the line, hopefully with both rear wheels just on the gripping side of slipping. Spin a wheel and all is lost.
The competition cars you have seen go smokin' off the line have limited slip or locking diffs which feed power (near)equally to both wheels, so will have more grip in a rear wheel spinning situation than you will have with a convetional diff.
Depending on your engine characteristics and gearbox ratios there may even be different ways of going about the acceleration, eg getting the clutch fully engaged early and driving the car on the engine, or using the clutch as a torque convertor and slipping it all the way to your first change (mind you that will smell a bit fishy...) also to short shift into second or hang on for the lat 100 revs and then grab second.
have you a vitesse gearbox and a 3.27 diff? in which case, don't try for glory because you have the wrong gear ratio to begin with, just go and enjoy the day!
have you got roto? in which case go easy on those doughnuts, get the clutch fully engaged early and drive it out on the throttles
j
for cars with conventional diffs your fastest way off the line will be by using the clutch as the slippage item, feed the clutch in to keep the engine revs at max torque (about 4k rpm) and open the throttles to keep the engine speed up as the car moves off the line, hopefully with both rear wheels just on the gripping side of slipping. Spin a wheel and all is lost.
The competition cars you have seen go smokin' off the line have limited slip or locking diffs which feed power (near)equally to both wheels, so will have more grip in a rear wheel spinning situation than you will have with a convetional diff.
Depending on your engine characteristics and gearbox ratios there may even be different ways of going about the acceleration, eg getting the clutch fully engaged early and driving the car on the engine, or using the clutch as a torque convertor and slipping it all the way to your first change (mind you that will smell a bit fishy...) also to short shift into second or hang on for the lat 100 revs and then grab second.
have you a vitesse gearbox and a 3.27 diff? in which case, don't try for glory because you have the wrong gear ratio to begin with, just go and enjoy the day!
have you got roto? in which case go easy on those doughnuts, get the clutch fully engaged early and drive it out on the throttles
j
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Wheel Spin
Posted By : John Davies, 11-May-2006, 01:32am
James,
Were you asking for advice on the take off, as provided by Mr.Binnington, or about the 'burn-out' that dragsters and some hillclimbers do before they approach the startline?
Top fuel dragsters make it work, by softening the tyre tread in the burnout with, I think, bleach. But they are quite happy to rebuild the engine and replace tyres every run.
IMHO, warming the tyres by a burnout in a near normal car like yours is a waste of time. You can only warm the surface of the tread, and that heat will rapidly be lost again. To keep the tyre hot it must be 'heat soaked' - heated right through. See the efforts made in F1, not only before fitting the tyre in the pitstop, but when the course car is out, and the cars are running at reduced speed.
So a burnout before the hillclimb in your GT6 will not only risk damage as Jonathan says, it will do no good!
John-
Wheel Spin
Posted By : Barry Huffer, 11-May-2006, 01:43pm
They certainly used to use some exotic brew in the seventies to warm the tyres called bleach and it led to the expression "lighting up the tyres" as it was inflammable, it was frequently ignited by the exhausts not the tyre heat.
I thought that it had been banned for that reason and they only used water to smoke the tyres but what do I know I'm only a spectator.-
Wheel Spin
Posted By : John Davies, 11-May-2006, 07:11pm
Thank you, barry!
Shows how much I know - I assumed it really was Domestos.
Though I did wonder about that stuff being flung around by the tyres.
At Santa Pod last year, some of the more 'exuberant' casr did do this, and generate vast quantities of smoke.
The best bit though was the jet-car.
Full afterburner - wow! They may have needed a bit of water behind that to stop the tarmac lighting up.
John-
Wheel Spin
Posted By : James Beaumont, 11-May-2006, 10:43pm
here is my mates top fuel car doing the job
Wheel Spin-
Wheel Spin
Posted By : John Davies, 11-May-2006, 11:04pm
You mean they're MEANT to do that?
Nhoj
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