oh and... shifting without using your clutch pedal.. BAD BAD BAD... the best way to show how it is bad, is to show you how it works.. http://www.howstuffworks.com/clutch.htm for the love of your escort, please use your clutch pedal while shifting..
otherwise you will end up buying a new clutch or transmition..
Double clutching is a term used rather incorrectly in the movie the fast and the furious.Generaly double clutching is used when driving a heavy duty truck.Essentially you push in the clutch twice,once as you come out of a gear and once when you go in.If you actually tried to do this while racing you would miss the gear more often then not.I used to have problems when I drove truck where you don´t use the clutch except to start out.I caught myself instinctively doing it in my car,which I will agree is bad,but not as bad as going to 6th gear in a five speed which I almost did too many times.There is another aspect which used to drive me nuts because I have always been a two footed driver and that is when you drive truck all day and get in the car after work and as you are going down the road you push in the clutch and as you are kissing the windshield you realize that you drove the automatic today.he heh!
I will also agree. "double clutching" is essentially a waste of time. Don´t ever bother on the street.
If I remember correctly it might have some use in road racing. One other popular racing thing is "heel-toe" shifting. I never attempted it. it requires some weird foot work and considering I wear a size 13 thats not going to happen easily durring a race
When I first started autocrossing and instructor got me on not shifting at all once I got into second. I wasn´t the fastest but I learned how to drive the course and got pretty damn quick that way. Almost got a trophy for it too hehe.
anywhoo from what I hear shifting without the clutch isn´t to hard on the car. However you do have to do it at the right speed or you will grind the shit out of it. I probably don´t have to guts to figure out what the right speed is.
hey, somebody mentioned the use of double clutching in the fast and furious... I remember that! I just saw it my first time a couple weeks ago!
it was after the first race, when brian loses to "dom", and dom tells him off and says something like "and you´re still granny shifting, and not double clutching like you´re supposed to..."
lol... I couldn´t believe that was put in there, because there is no need to double clutch on the way up. That´s like the opposite of what you want to do...
Yes, you can shift without using the clutch. I would much rather use the clutch, even when racing. You can get extremely fast shifts. When my adrenaline is pumping and I´m workin smoothly, I can get my shift down pat in a fraction of a second, using the clutch. Power shifting, or not using the clutch, is actually slower and requires more force on the stick. But here´s how to do it:
Bring the car up to about 3K rpms (thats about where to do it on my 1.9L sefi) , and put light pressure on the stick, pointing into the direction of the next gear you´re going into. Then drop the throttle completely... just get your foot right off the pedal. The clutch plate and engine flywheel will rotate at the same speed for a moment, and right when they do that, the stick will free up and you can get it into gear wicked eaisly. Then slam down on the thottle again and you´re good. It´s basically just letting off the throttle for a split second, because the car will nose downward, making the wheel side and the engine side of the tranny spin equally.
It´s okay, but still not as fast as a well executed short clutch shift.
ok.. even if you can shift without using the clutch pedal, why would you? the only way that i could see a reason for doing it is if you are uncordinated and cant shift fast.. i shift hella-fast with using the clutch pedal..
have you ever been cruising on the highway in 5th gear and some stupid honda flies by you, and you want to show him how much of a ricer he really is? what is the fastest way to accelerate? to shove it in a lower gear of course.. but the only way to do this without putting stress on your clutch is to double shift..
instinctively most people shove it into a lower gear without prepping the engine, therefore making the car jerk before it accelerates... but ... to get rid of the jerking and add a boost on the acceleration, all you have to do is shift out of the gear that you are in (ex. 5th) into neutral, let go of the clutch pedal, rev the engine, and then quickly press the clutch pedal and put it in to the desired lower gear...(ex. 3rd skip 4th) let go of the clutch pedal and accelerate like hell.. compared to normal downshifting, it feels like you just added craploads of horsepower onto your engine..
i may be wrong.. but everything that i have ever read or heard, says that double shifting is an extreamely good technique that can be used in every day driving and will extend the life of your clutch
There are *three* separate spinning entities that need to be coordinated when shifting: The engine. The transmission input. (I´m going to refer to this as the intermediate shaft). The transmission output (which is directly related to the vehicle speed).
When the clutch is disengaged (pedal pushed down) and the transmission is in neutral (such as when shifting between two gears), the intermediate shaft is essentially free spinning. In normal shifting, we rely on the synchro´s to control the speed of the intermediate shaft as it engages with the gears connecting it to the transmission output.
Decades ago, transmissions didn´t have synchro-mesh. (Many large trucks still don´t). On these transmissions, it is necessary for the driver to manually control the speed of the intermediate shaft so that it matches the speed of the gear to be engaged. This is done by the following process when shifting from one gear to the next:
1) Power is removed and clutch is disengaged (pedal down). 2) Transmission is shifted from original gear to neutral. 3) Clutch is re-engaged (pedal up). (Driver now has control of intermediate shaft speed by controlling engine speed). 4) Driver ´blips´ throttle to match intermediate shaft speed to speed of new gear. (This takes practice to get the right match). 5) Clutch is disengaged (pedal down). 6) Transmission is shifted from neutral into new gear. 7) Clutch is re-engaged (pedal up) and power is applied.
Steps 1 - 3 can be done casually or quickly. Steps 4 - 6 *must* be done quickly so that the intermediate shaft doesn´t slow down again before it´s engaged. If step seven is also done quickly, the engine will also be ´rev- matched´ to the rest of the driveline so that engagement will be smoother."
taken from http://www.happytogether.com/318ti/notebook/shifting/
i agree, double clutching from 5 down to 3 is the way to go, but i can extremely smoothly go from 5 to 4 without double clutching. i just keep constant gas pedal pressure and quickly shift back the shifter into 4 (this is goin around 100kph, 60mph)
was very nice
At work I drive a 1985 ford f350 4 speed dump truck that i never use the clutcch on cause it grabs about an eighth inch from the floor and is useless. Thats the only thing i would do it too. You have to get the method down good. Tack it up highg and let it wind down a little to shift it. Kinda tricky to learn. I wouldn´t do it on a tranny that was any where decent. I was told only truck tranny´s can really handle that.
And I know what you mean about when your driving home and go to push the clutch but you realize there is none as your head bounces off the steering wheel. I do that quiet often.