What is the purpose of double-clutching in racing?

Question

I've heard in numerous places that double clutching is used during racing. To my knowledge, double-clutching is a technique used to synchronize gears in older model trucks. So, what, if any, advantages are there over regular shifting during a high performance activity such as racing??

Answer 1

it can bring your rpms up by 50 it is used for older vehicles, or in racing mainly and car etc that doesn't have synchronizers
Double-clutching ads a third step into changing gears. The shifter, rather than going straight to the next gear, makes a stop in neutral and then the clutch is released. This is to allow the engine to slow down (or with a tap on the gas, speed up when downshifting) so the transition into the next gear is much more smooth. The driver then depresses the clutch again and completes the shift into the target gear, and finally the clutch is released again, putting the car back into gear. It only takes a split second for the engine speed to match the speed of the gears, so the entire action is done very quickly as a fluid sequence of events. :)-

Answer 2

Under normal circumstances, double-clutching is not used any more in racing - it's too slow to shift that way. The only exceptions to this rule is: 1) if you need to shift down to first gear (using an old H-pattern gearbox) - first is hard to engage at speed, and double-clutching makes the shift easier and smoother, and 2) vintage racing, where the cars don't have synchromesh gears. You rarely see double-clutching these days, as most race gearboxes are sequential shift - there is no neutral between second and first to use for the double-clutch.

Answer 3

Race cars have straight-cut gears which do not try to force themselves apart and out of the case. They need to be double-clutched if they are made without synchros.Helical cut gears and synchros allow transmissions to shift smoother and run quieter,but they add rotating mass, and are less durable which are undesirable qualities in a racing application where noise and harshness are acceptable in the quest for speed and endurance.

Answer 4

many of the replies are your best option yet how does this custom to racing? I raced for extremely some years and my son additionally (here in England). Neither persons used double declutching. My race vehicle grow to be using a typical synchromesh kit container and that i actually "smashed" it into gears. The quickest kit differences (in accordance to my datalogger) have been approximately 0.2 seconds. The gearbox mandatory rebuilding each and every 2 hundred miles or so of racing. Double declutching is in basic terms too sluggish. My son's final race vehicle had a promptly shrink gearbox (no synchromesh) and, different than for having it off the line and a few uncommon downshifts, he did no longer use the grab in any respect. It grow to be a sequential container and geared up very solid so it mandatory one rebuild in line with season in basic terms. Double decluching might have cost him a million.5 seconds in line with lap a minimum of. kit substitute speed? approximately 0.04 seconds!