Double Clutching

[pimp86LX]

A valkury? i thought that was a Honda.........

[1988starter]

it is a honda 1.5 V6 VTX 1.8 V6

[pimp86LX]

yeah i thought so. thats a nice bike to cruise on, I don't mind the HD style but i really don't like the sound....Honda rules!!! in every aspect. My buds got a 350-4 wheeler, we rip around on that ALL day and it just takes the punishment and keeps on goin

funny how a thread can drift so much eh?

[1988starter]

right now we have
88 accord LX-i
86 accord LX
86 prelude Si
99 Montana Van
2001 TRD Solara
82 V45 Magna

Yes these threads drift well

[pimp86LX]

We have

4 1979-1985 Honda cb 750k
1 1985 Suzuki GS 750
1 1967 Honda 175 twin
1 1980 or so Suzuki TD185 Oil injected 2-stroke
1 1983 CR-80R
1 1986 CR125R (reacently sold)
1 1974 cb550
and a Nice ole' gold wing my paw drives

only the wing and my bike are on the road but my dad and i restore and sell old hondas for fun


BIeKES RULE almost as much as 3g's (almost)

[pimping89lxi]

89 Honda Accord <<~~~~ My BABY!!
2G Mustang Convert

89 Toyota Pickup <~~~Pops
93 GMC Safari <~~~ moms

And my lil sis' 1999 Lamborghini DIABLO!!! Its only a Damn 2 seater! Damn shame! Convertable and looks alright for a Pink Lambo!! And that damn Babie signature does it no Justice!!

[87accordlxph]

Originally posted by Inabj2
k im a fucking idiot. *puts the i a fucking idiot hat on*

but wtf is granny shifting? Ive heard this term 400 times and im not exacly sure what that is. But at least im hont and admit that i dont know what that exacly reffers to. is it letting go off the gas between shifts? i drive and automatic. k well let the flaming begin

and what the fuck? does wtf stand for??? (joke)

Oly shit guys! This thread got way outta line and off topic.

I laughed my asss off when I read this one!

heh, it's still f@kin funny! :lol :lol :lol :lol

ta heee

[3rdgenSLIMER]

ok, i didn't read every reply but heres my opinion on "double clutching"

ok, say your racing, and your foot is all the way down on the gas, and you change into, say, 2nd gear, keep your foot all the way down on the gas and change gears as freakin fast as you can. thats what an old dude that races out at the track where i race told me. but it can burn your engine up pretty good if you do it too much.

[pimp86LX]

[jteuton]

I think thats called power shifting through the gears. Anyways my 2 cents...I was taught that double clutching is when you rev the engine and match the revs close to what they are going to be when you drop it into that gear....helps save the tranny and clutch or something like that....ie...downshifting to second at 45 to gain speed and you know at 45 that your engine pull 5g's then you push the clutch in ...rev the engine to 5g's and then engage the transmission into second.....anywaz that is what i always thought

[dosh8er]

I will emphasize the fact that there IS NO REASON to double clutch in our cars. The previous threads are right, our transmissions (manuals) are syncronized transmissions. This double clutching IS NOT good for your transmission. You're putting pre-mature strain on your drivetrain.

And I won't begin on this crap about pushing the clutch in and out really fast. That makes ABSOLOUTELY no sense at all. That has NO physics behind it. It goes against all common physics laws. Think about it. You're disengaging the clutch disc from the flywheel, when you re-engage them (i.e. releasing clutch) you're transmission has slowed down a bit, maybe going at almost the same speed, but your engine, the flywheel, is moving slower. So when you re-engage them, you're taking a slower moving body and throwing it against a faster moving body. NOT GOOD.

How bout we try this experiment. All of those who think this crazy idea works (and want to stand behind it) can do this: while someone is driving a vehicle down your road at 30+ mph/kph, pretend you are the fly wheel, and the road is the clutch plate. Then, while the other person is driving along, you just open your door, and jump out to meet the pavement below. That's the equivalent of what you do with clutch when you're doing this crazy in/out stuff.

(this experiment not to be preformed by the elderly, the sick, pregnant women, or those with back problems. this site, www.3geez.com, it's affiliates and the author of this thread are not liable for any injuries associated with this experiment. )

[monsonhonda]

what their saying is the engine speeds up before the clutch goes back in and help them or something, whatever, not gonna dispute that. however, i was wondering something about my car, i believe i have my clutch cable adjusted right, its at specs. but if im driving down the road and go to put it into 5th it grinds sometimes, and believe me i have the clutch in, it not much of a grind, just a little crunch, at also does it sometimes in reverse. any ideas.

thanks

fussell

[Coitis1]

What is powershifting?? I've heard this term tossed around a bit. There's this mexican guy I know who has a stock '00(i think) mustang with an auto and everyone says he powershifts. Well i was rollin with him once and he manually shifts through the gears with his automatic. i.e. - like starting at 2, going to d3, then d4 on our cars.

[87accordlxi]

[Jims 86LXI HB]

Oooohhhh boy we're still milking this thread Please let it die.

[87accordlxi]

i dunno, i saw the fast and the furious mentioned somewhere on the other page so i thought i'd throw in some nonsense. i would be delighted to send this thread into the gutter

[Sean]

blow this damn thread up much appreciated.

[monsonhonda]

definately end the thread, tomany people calling every function of a mnual transmission doubleclutching, net it will be, i heard double clutching is when you shift into reverse between gears, it helped my 90 year old grandfather back in the war.......

[92cx]

i would never suggest double clutching upshifts on gearbox with synchros unless there shot(yes i have done this for exactly that reason) however downshifting is an etirely different story, the primary use for double clutching is to match revs to avoid scratching the synchros and more importantly to avoid upsetting the balance of the car at the limits of adhesion... i would not suggest ever shifting while cornering near the limits of your car but braking is also affected by sloppy shifts and at somepoint you can upset the car even under braking so basically learn to doubleclutch and heal/toe downshifts.. but avoid it with upshifts unless your car grinds upon entering gears(and you don't wanna hear it grind) i often double clutch upshifts in my one friends 86 crx si cause the tranny is shot and i don't like grinding other peoples shit

[dXsquared]

ok...this is a super old thread and shit... but i just wanna say my bit...

POWER SHIFTING is when u dont take your foot off the gas and slam the shifter real fast in to the gears... i know that when i red line my car in 1st and power shift to second, it spins for 15 feet adn then accels some more...


Travis

[1986hbdx]

Double-clutching was common in older cars and is still common in some modern race cars. In double-clutching, you first push the clutch pedal in once to disengage the engine from the transmission. This takes the pressure off the dog teeth so you can move the collar into neutral. Then you release the clutch pedal and rev the engine to the "right speed." The right speed is the rpm value at which the engine should be running in the next gear. The idea is to get the blue gear of the next gear and the collar rotating at the same speed so that the dog teeth can engage. Then you push the clutch pedal in again and lock the collar into the new gear. At every gear change you have to press and release the clutch twice, hence the name "double-clutching." This from: http://www.howstuffworks.com/transmission2.htm

[SYKO5150]

your done go feed the donkeys

[2twisty]

Sean is right. Double clutching is absolutely REQUIRED for unsynchronized trannys.

However, the posters that say it's useless on a synchronized tranny are missing out on some performance...

The purpose of double-clutching is to match the speed of the engine and the transmission's guts.

What synchronizers do is help speed the guts up, but it takes some time. Have you ever noticed when you go to downshift without a double clutch that you have to push on the shifter for a couple seconds before it snicks into gear? That is because the input shaft of the tranny is turning at the wrong speed for that gear, and the syncros are working to "synchonize" their speeds. When the speeds match, it snicks into gear.

Now, double-clutching allows you to synchronize the gears manually, and is often MUCH MUCH faster than waiting for the synchros to do the job for you.

When you double-clutch, you put the tranny in neutral and let out the clutch. Then you hit the throttle to speed up the transmission input shaft to match the speed that it needs to be for the gear you're planning to select.

Then, you push in the clutch again and go for the new gear.

If you learn to do this fast enough and properly, your downshifts will be VERY smooth without burning on the clutch or waiting on the synchros.

If you're trying to get the fastest downshift on your manual tranny, double-clutching is the way to go.

There is another method called heel-toe, that is VERY similar to double-clutching, but I haven't mastered it yet, because my feet are too big in my Miata to do it properly.

When double-clutching, you have to do it LOONG before a turn that you need to downshift for because you need to complete it before braking. This costs you valuable time. Double-clutching is fine for straght-line performance, since you aren't looking to power out of a turn any time soon (we hope)

However, in twisty situations, such as autocross or road course track racing, a heel-toe is better because it allows you to brake while you're doing a double-clutch, which allows you to carry as much speed as possible into a turn, scrub it off at the last second while selecting the new gear and power out of the turn.

Essentially, you do a double clutch, but you keep your gas foot on the brake and just roll your foot over onto the throttle when you're in the "neutral" phase of the double-clutch.

I use double-clutching all the time to help with smooth downshifting. It avoids the lurch assoiated with selecting another gear, while at the same time avoiding burning on the clutch to avoid the lurch.

Give it a try sometime. It DOES work, and it IS useful. How useful in a 3gee? That may be debatable, since it's not likely that you're gonna be autocrossing any time soon with it. I can't comment personally on what kind of gains you get on a 3gee since mine is an auto, but my other 2 cars are manuals and I *do* drive the piss outta the Miata on a regular basis. FWIW, I double-clutch my Subie regularly as well, but not as often as in the Miata (I'm sure you're not surprised)

I like to think double-clutching and heel-toe are friendlier to the clutch AND passengers.

And it does have a "racy" excitement value too. Is just *feels* fast..because it **IS** fast.


Chad

[87DXHatch]

Wow... very detailed explanation... thanks

[87accordlxph]

Ok so... I'm still confused?
What are the matching speeds w/ the rpm and tranny for our cars. I end up grinding my gears when I try this method?

Thanks,

-Mike