Yeah JDMS14 got it about right. When Vin Deisel talks to Paul Walker about not double-clutching and granny shifting he was talking out his ass. No one has time to double-clutch in a drag race. Not to mention how did Vin Deisel know what was going on three cars over during a sub 10 second quarter mile? He would barely have time to know what was going on in his own car. Anyways don't get me started on that movie or I will never shut-up.

 

ha ha

 

yes.. jdms14 is correct... but a friend of mine that used to drag race all the time told me another meaning to double clutching.. from wut he told me double clutching in drag racing is lets say you're racing and you're in second gear... you shift to third but u want a lil more pull... wut u do is you push the clutch in while your on the gas and let off right away letting your rpm go up and it gives you that extra lil kick... ive tried it and it does work...

 

yes.. jdms14 is correct... but a friend of mine that used to drag race all the time told me another meaning to double clutching.. from wut he told me double clutching in drag racing is lets say you're racing and you're in second gear... you shift to third but u want a lil more pull... wut u do is you push the clutch in while your on the gas and let off right away letting your rpm go up and it gives you that extra lil kick... ive tried it and it does work...

Okay, when ever I race I just Launch 3-4K then shift at 6k nothing too fancy. I think this is how the pros do it. They don't keep messing witht he clutch. Isn't all your doing when you rev the engine while the clutch is depressed is losing precious seconds. It may feel like your going faster but you actually are going slower. I think you may feel the jerk because when you shift your not gaining any momentum until you release the clutch. All your doing is like slowing is like letting off the gas and pressing it again. The same feeling?

Heres a story, my friends which don't know too much and look up to this one guy do this thing. They call it double clutching. They have Integra GS-R's and Hatches. Well when they race, Going WOT they will kick in the clutch and keep doing it while say there in 3rd gear at 4k 6k etc.......they just keep kicking it in. It feels different'(feels like its jerking moving) but I think they're losing just precious distance. Am I thinking logical here?

Btw: I havn't been on the boards too much. Too busy right now.

 

OMG...you guys watch too many ricer movies.

Double-Clutching, is a technique used in old cars with syncro-less transmissions, or really beat syncros. The action would go like this.

3rd gear
<push in clutch>
Neutral
<release clutch, then push clutch in again>
4th gear

It has nothing to do with racing.

As far as these "other" descriptions, they are not "double-clutching".

Staying in the gas when shifting is common among faster racers with decent driveline/Engine Management setups--but is not double-clutching.

I rarely lift to more than 3/4 throttle when shifting at the track. If you're shifting like you should, there should be no "sudden jolt". If you're getting this jolt, you need to learn how to shift faster.

If someone is using a 2-step they typically will keep the gas matted during shifts.

 

I'm going with DSSA's reply. Double clutching doesn't have to do anything with racing but rather the syncros in a transmission.

I had to double clutch and usually rev match in my previous car to get into 5th without grinding gears. Failed syncros suck.

 

QUOTE]


You have a 951? :yummy

I still want to find one of those to play with at some point.

 

I think what most people are talking about is sidestepping the clutch....some technique. I forgot.

I double clutch when i downshift sometimes just before stoplights just for the hell of it. NO real purpose but just to practice =) WHY are you guys putting it in netural when you do it. THERES no need for that step. JUST clutch in, blimp then go down a gear and release.

 

Moderation Note: Moving to General Tech.

 

I think what most people are talking about is sidestepping the clutch....some technique. I forgot.

I double clutch when i downshift sometimes just before stoplights just for the hell of it. NO real purpose but just to practice =) WHY are you guys putting it in netural when you do it. THERES no need for that step. JUST clutch in, blimp then go down a gear and release.

For the love of god man...

Read the above posts, and learn what "Double Clutching" is.

What you're talking about is called "Rev Matching" not "Double Clutching". Two entirely different things.

Once again....

Double Clutching would be pressing in the clutch, putting it in neutral, letting out the clutch (to spin the input shaft), pushing in the clutch again, then putting it in the next gear. *TWO* engagements/disengagements of the clutch, hence the name "*DOUBLE* Clutching". :26wtf

Sidestepping the clutch has nothing to do with it either.

Sidestepping is simply moving your foot sideways off of a depressed/slightly depressed clutch to allow it to release suddenly.

 

Double clutching is also known as "rev matching." Rev-matching is a great way to downshift without putting excessive wear on the transmission's syncronizers. Allowing you to downshift into much lower gears without gettin whiplash. It's name says it all "rev matching" is simply matching the revs needed to enter into a lower gear. IE: if your in 4th running at 3000rpm you know that when you downshift your rpm tends to jump about 1000. So all you do is while your downshifting rev a little past 4000 (keep in mind the rpm drops while your taking time to shift) so by the time you reach 3rd gear your rpm will be at a rpm high enough to make the shift change smooth. Thats all I gotta say about that.

 

But DSSA IS right, eventhough they are known as the same they are in fact DIFFERENT.

 

Can someone explain to me and the rest of these geniuses why pushing in the clutch while in gear AND racing would cause your car to go faster? Oh yeah, I have a $80,000 Green Eclipse with a Full Motec System Exhaust and NOOSSSSSSSS? I guess if I had double-clutched and not granny-shifted I would have beat Vin Deisel and then I woulda been respected. Now I am just a little shit with a toasted $80,000 DSM! I mean honestly how the hell would pushing the clutch in make you go faster?

 

Can someone explain to me and the rest of these geniuses why pushing in the clutch while in gear AND racing would cause your car to go faster? Oh yeah, I have a $80,000 Green Eclipse with a Full Motec System Exhaust and NOOSSSSSSSS? I guess if I had double-clutched and not granny-shifted I would have beat Vin Deisel and then I woulda been respected. Now I am just a little shit with a toasted $80,000 DSM! I mean honestly how the hell would pushing the clutch in make you go faster?

Umm..that's kinda the point of this whole thread. It *ISN'T* faster. The only people who think it's faster are ricers who watch too many movies.

 

But DSSA IS right, eventhough they are known as the same they are in fact DIFFERENT.

They are only known as the same by people who are incorrect.

Rev-Matching and Double-Clutching are two different things that have gotten confused as the same thing.

Double-Clutching: Something old Dumptruck drivers with beat transmissions do

Rev-Matching: Common technique used by road-racers and auto-x people.

Only reason people confuse the two as "Double-Clutching" is from listening to other people incorrectly trying to explain what "Double-Clutching" is---mostly after the F-n-F influenced noobs and ricers into thinking that the movie was anything but a sham as far as tech is concerned.

 

yes.. jdms14 is correct... but a friend of mine that used to drag race all the time told me another meaning to double clutching.. from wut he told me double clutching in drag racing is lets say you're racing and you're in second gear... you shift to third but u want a lil more pull... wut u do is you push the clutch in while your on the gas and let off right away letting your rpm go up and it gives you that extra lil kick... ive tried it and it does work...

This is called "speed shifting" or "power shifting"

 

I used to do it in my honda

 

idk bout anyone here but they have been playin fnf on all the movie stations alot lately. so i watched it again. any how if u pay attn u'll notice the even tho mr big ass vin dipshit is talkin bout double clutchin all he is doin is gear snatchin. so who knos
personally ima rev matcher. works for all occasions.
esp when u do it so nonchalantly to prepare whip someones ass ina roll on race. cause if u do it rite ur exhaust will only go up an note like u are flooring it in 5th. its fun till they realize ur runnin 3rd and u pull on em

 

autox rarely shifts gears during races. no need to rev match then

This depends on the course layout and the car's gearing. I can tell you that for the 3 years that I auto-xed I did a lot of shifting, albeit, only 1st, 2nd, and 3rd (and 3rd only on some tracks that had some abnormally long straights).

 

This depends on the course layout and the car's gearing. I can tell you that for the 3 years that I auto-xed I did a lot of shifting, albeit, only 1st, 2nd, and 3rd (and 3rd only on some tracks that had some abnormally long straights).

may I add that it also depends on the car your driving and the weather conditions too, alot of times some of the best times achieved are through actually shifting to squeez that extra power outta there and minimize your time as much as possible but then again I drive a miata so the gearing is very close and short.

 

Can someone explain to me and the rest of these geniuses why pushing in the clutch while in gear AND racing would cause your car to go faster? Oh yeah, I have a $80,000 Green Eclipse with a Full Motec System Exhaust and NOOSSSSSSSS? I guess if I had double-clutched and not granny-shifted I would have beat Vin Deisel and then I woulda been respected. Now I am just a little shit with a toasted $80,000 DSM! I mean honestly how the hell would pushing the clutch in make you go faster?

This enables your engine to rev freely and quicker to a higher RPM which will be higher up the powerband. Given you have a strong clutch, your car will 'leap' forward as there is more power availale to get you to a higher speed. Kills clutches quick. It also only works if you are reving low in a higher gear (higher meaning 3rd or 4th)

Double clutching is for synchroless gearboxes. Maybe the writers of that move meant 'Flat Shifting'

 

Can someone slap this Joel 180 guy? I understand how everyone says it works but pushing the clutch in while accelerating CAN NOT make you go faster. The surge comes from the fact that when you push in the clutch the car slows down a little and when you push the clutch back in the car starts to accelerate again. That is where the "Leap" comes from. Not from any gain in speed.

 

Can someone slap this Joel 180 guy?

OK :yesnod :smacked49 :rotflmao :spitfight

 

hahaha yeah all it does is keep the revs up in gears and saves time so that you don't have to let off gas works good in hondas but not in other cars

 

ok newbs and non technical car people. Double clutching has been pretty much explained by means of digging back into time where the only way you could select engage a gear was by means of double clutching. Now it can still be useful with todays cars and I believe thats been explained too.

but maybe i've put this into easier terms: :12dunno
rev matching does not require you to go back into neutral, it is simply pressing the clutch so that you can blip the throttle and predict or choose by means of rpm, where the power delivery would smoothly match up with the gear that you will then directly select which usually would be the next gear down. Why would this "smooth" transition be useful? well it's useful so that u can prevent the jerk that occurs through the driveline when you suddenly downshift, that jerk can throw the cars balance off especially during critical turns or poor track and or weather conditions. Rev Matching does not benefit you at all while acclerating through a straight-away since the last thing you'll worry about is a jerk while going straight.

Now if you didn't understand that than watch a best motoring video and pay attention to the crazy drivers in there, pay attention to thier footwork.