ok guys.. i'm kinda confused of what is double clutching.. i was told that if i was lets say cruising at 50mph in a certain gear and want to speed up without downshifting i would apply throttle and clutch at the same time and that would make the rev shoot up to like 4500 - 5000 rpm release clutch and i would get that boost. is that double clutching? or speed shifting? and does this technique harm the clutch or the engine? i'm really confused.. i'm hearing different stuff. educate me.. hehe

 

The first example is a great way to blow your engine or ruin your clutch, I wouldn't recommend it. Speed shifting is shifting without using the clutch... wouldn't recommend that either. If you want that boost; downshift and nail it. I've driven older cars and military trucks where the trans was semi shot or the syncros are going out and I would have to double clutch to keep the gears from grinding when shifted. That's what I know about that, hope this helps.

 

AFAIK double clucting is for trannys without syncros. You depress the clutch once to get out of gear, release clutch and then depress again to shift back into gear.

 

so what about the technique that i was told of? can't u just take off quickly by applying the gas and clutch at the same time but being careful not to over rev cuz.. the rev meter will def shoot up if gas is apply while clutching all the way down?

 

Still a good way to blow engine and ruin your clutch.

 

that technique is called "burning up your clutch for no really good reason"


When you are cruising at 50--your flywheel(engine) and clutch are turning at the same speed. When you push the clutch pedal in, the clutch disc comes off the flywheel. If you stomp on the gas, the flywheel is going to speed up--as the clutch disc slows down.

When you hit the gas and bring the revs up..and then ease off the clutch, the two come together at different speeds--causing unneccessary wear.

Dont do it.. Ok...do it if you want to...

 

One thing you can do it rev up your engine before downshift, so that when you gear in the lesser gear, your engine is already at the right rev... that way youll have a better launch.

 

I blame this crap on the movie "The quick and the angry!" What a blatant misuse of the term "double-clutch". As was mentioned, not needed if the trany has synchros.

 

Unless it's a notchy Nissan tranny with **** synchros. In mine, the only way to smoothly shift from 2nd to 3rd and 4th to 5th was double clutching and matching revs (it did get better, but by no means "cured", after switching to Redline MT-90).

 

If you want to do that, go buy a ford....the one with a CVT...then you don't have to even shift.

 

Just shift normally. You haven't had to double clutch for decades...

 

oh Vin Diesel....what have you done to this poor confused person....

 

so double clutching is when you go from 5th to neutral, then to 4th, so your using the clutch twice? thats pointless. why would you do that? that takes more time than just down shifting.

 

you rev match as you go from 5th to neutral....u don't just press in the clutch twice then move it into 4th...u rev match while yer in neutral

 

I never heard this one before....From what I know....speed shifting is shifting as quickly as possible by using the clutch and letting off the gas.....power shifting is shifting as quickly as possible by using the clutch and NOT letting off the gas....and clutch less shifting is shifting without using the clutch at all....

 

double clutching is used on older cars with trannys w/o syncros, used when downshifting. Lets say you're going from 5th at 40mph to a 3rd. The car would jerk since you're skipping the 4th gear, but if you will shift from the 5th into to neutral, let go off clutch, rev the engine up, then quickly depresss the clutch, shift into 3rd, and let go off clutch (while rpms are still up), it would be a much smoother shift. Hope this helps

 

Power/speed shifting: do not try on weak Nissan trannies (well, to be fair, or on any helical geared tranny. Got to have straight toothed gears).

Now, let's talk about heel & toe, baby!

 

Vin Diesel, the slow and the curious

 

wow double clutching huh? or ya mean double dutching? jump rope? oh geez here's an even better question!(sarcastically) how bout for an auto? can i drive it like a manny? ya know suppose im doin 50mph and i want to feel that extra "boost" , is it really okay to downshift to rev the engine up and floor it til it redlines then shift up to "D"? can i do it all the time when im driving? so what if i blow the tranny right? they still rebuild nowadays anyway dont they?

sorry you guys had to deal with this double clutching matter! i thought for a person driving a manny, they would know better! way to go paul walker/ brian o'connor!

 

[QUOTE=BLUEMAX01SE]wow double clutching huh? or ya mean double dutching? jump rope? oh geez here's an even better question!(sarcastically) how bout for an auto? can i drive it like a manny? ya know suppose im doin 50mph and i want to feel that extra "boost" , is it really okay to downshift to rev the engine up and floor it til it redlines then shift up to "D"? can i do it all the time when im driving? so what if i blow the tranny right? they still rebuild nowadays anyway dont they? QUOTE]

whats your problem dude? lighten up a little, a guy just asked a question, and a prettty innocent one.

 

Is it just me or there is not enough space in the max to heel & toe properly??? In my 2000 SE, the center console at the base is so close to the accelerator that my heel hits it first and I cannot easily press the gaz will I brake...

is this the same on the 5.5 gen? or is it just that I have too big feet?!?!

 

[QUOTE=Y2KMaxGXE-R] well said......i use double clutching all the time, when downshifting as well as upshifting...for example, i want to do a bit of a sprited run to get to speed, and say im accelerating to 60 (where 2nd gear redlines) so i gun it all the way to redline, then apply the clutch, put it in neutral, then wait for it to drop down to the right RPM for 6th gear (since i would be at cruising speed) then when it reaches that RPM put it into 6th...you can do this when downshifting as well (and many people have already explained that one, so i wont go into detail..)

 

i feel that way too...i thought it was just because my feet were too big or something...(size 13..)

 

"Heel and toe" is really a misnomer, it's more like left and right sides of the ball of the right foot. Try that.

But my problem is not like yours. I'm 5'11"/180 lbs (I say well w/in the design range) and can't heel and toe mostly because if I set the distance to the pedals the way I want my legs to rest, I can't reach the steering wheel properly, and if I set the seat to reach the steering wheel to get the right amount of leverage, then my knees seat abnormally high. If only the steering column telescoped about an inch plus...

 

As others have posted, you normally don't have to double clutch since the syncros will take care of the rpm match.

However, I found an instance when it's useful. This is when I'm coming off a highway cruise into a sweeping turn exit. This just begs for a 6th to 3rd downshift to put me in the sweet spot to control speed through the turn and power out.

Unfortunately, this is just too much of an rpm mismatch for the 6 speed tranny. You'll get a massive grind. Solution is to double clutch and goose the throttle during the shift to bring the revs up.

Also, unfortunately, I'm not real good at this. I can get it right 3 times out of 4 and at that rate it's just not worth the damage I'm probably doing to the transmission the 1 time out of 4.