Double clutching

[justinc]

Is this how u double clutch some guy told me it was and i was wondering if hes right and is this okay on ur car and does it help for racing.
To upshift you depress the clutch while moving the stick to N, when the stick is in the N position release the clutch. Depress the clutch and move the stick in the gear you want, rev match the rpm to your speed with that gear (heel & toe i think its called) and as soon as the stick is in gear let the clutch engage.

[Jeff240sx]

Yeah.  Did you guys just get done reading the book "Joy Riding"?  My friend did, and tried double clutching for a couple weeks.  I didn't like it.  I told him to do it my way.
Why should you make the clutch engage twice?  Just rev the car until you match the revs with the gear's speed.  Like, his car at 50 in 5th is 1800rpm.  To switch to 3rd, give it gas untill about 3800.  SOOOO much smoother.
-Jeff

double clutching SUCKS and you should only do it if your clutch doesn't have much life left and if you're downshifting! Because well... it takes much longer to downshift than to upshift. And it's so time consuming and no one really does it anymore. Try powershifting, it's a bit more popular LOL!

[AJ]

eeeeech, powershifting is scary!.. i've riden with some guys that can do it really well, but as soon as i'm in the drivers seat, i don't want to break any gears, i can't bring myself to try to engage it with no clutch, far to scary,  if i wanted to learn how would i go about it?

[konkman]

I'm thinking if you guys can't double clutch to the instructions at the top, just call it shifting. Here's a little hint, double refers to the number 2. And clutch refer's to the clutch. You much hit it twice to "Double Clutch."

And being able to double clutch is as simple as knowing your car. You just need to get a feel for how high you need to kick it. When you double clutch, speed is the ultimate goal, that and saving your clutch.

Yes, saving your clutch s13grl. If you do it properly you will prevent yourself from burning your clutch altogether.

Practice, it isn't something you can just do because you drive a stick.

Clutch (car in N), Gas, Clutch (car in gear), and quickly release clutch and go.

oh thats what that is.  i knew about that i just didnt know what it was called.  i didnt think it had anything to do with double clutching.  btw no need to be sarcastic but thanks

[DSC]

I was reading some older posts on the fourm and saw a link that had a decription of what it is.
http://www.turnfast.com/tech_driving..._heeltoe.lasso
The very last paragraph has a good description, basically the same thing konkman said but in more detail.

[LanceS13]

As said in the link posted by DSC, it is only necessary in a race car tranny...i.e. a tranny w/o synchros. It's a downshifting technique, not something you'd use in a drag race (for those who were mislead by TF&TF). For our street cars, a "simple" heel/toe, rev-match technique in which the clutch is depressed once would be the best way to downshift.

(Edited by LanceS13 at 7:48 pm on Sep. 4, 2001)

[my240likenoother]

i say just after letting off the brake give the gas a tap and release the clutch at the same time slaming the gas
same  thing as double clutching
with a lot less thinking we have enought to think about when we race

[LanceS13]

That'll work my240, but if you want to shave seconds and you have decent pedals, learn to heel/toe downshift.

[transient]

my240: That's exactly what I do, I really don't get the point of doubleclutching...

[LanceS13]

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote </td></tr><tr><td id="QUOTE">Quote: from transient on 11:12 pm on Sep. 4, 2001
my240: That's exactly what I do, I really don't get the point of doubleclutching...</td></tr></table><span id='postcolor'>
that's b/c there is no point to double clutching in a street car.
However, as I said, benefits can be seen using the heel/toe (single clutch) technique described in the first part of the article that DSC posted a link to.

[misnomer]

I've been trying to do that in my car since I read the article (just parked, practicing the motion) and I can't for the life of me get my heel to the gas pedal. Mebbe I'll look into some racing petals, or just not wearing hiking shoes when I drive <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/tounge.gif" border="0" valign="absmiddle" alt=':p'>

[LanceS13]

It's actually easier for most people to use the sides of your foot (right side/left side) as opposed to the ends of your foot (heel/toe). &nbsp;It can be done with the stock pedals but it's hard...especially if your foot isn't very wide (I wear 9 1/2 <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=':)'>). &nbsp;And the best shoes are the most worn, flexible, lightest shoes you can get.

[M3l240sx]

Go to the tech forum and read my posts for shifts... you guys are talking about match reving, the original poster of the topic is right about how you do double clutching. What he explained is double clutching, and double clutching does not save u're clutch but it doesn't hurt it any either. &nbsp;Match revving on the other hand does save your clutch. &nbsp;Heal and Toe (for the original poster) is only refered to during downshifts, if you double clutch fast enough you dont need to gas anymore. &nbsp;What heal and toe is , is a COMPETELY other topic... its for more or less track use only but basically its when you are using all 3 pedals of the car before/during a big apex turn. &nbsp;When you dont match revs (like what konkman is talking about) your car jerks, and it also does burn some clutch. &nbsp;But how do you match revs when you have to break with ur'e right foot also? &nbsp;and whats the reason track drivers do it? &nbsp;Well, there's the heel and toe... &nbsp;you use u're toe to press the break pedal (threshold break if you need to) then slide your heel to push the gas pedal some, then select the next DOWN GEAR (with clutch in). &nbsp;Why this is useful, it does 3 things in one motion, it downshifts smoothly and also slows you down significantly, also putting u at a more powerful gear for use after the big turn. &nbsp;(on the track you tend to go as fast as you can during straights, then slow down as much as you can during turns, thats the whole point of apexing... exit speed for the straightaway... shaves alot of time off the lap) &nbsp;I emphasize again on SMOOTH, when you match revs you downshift smoother, that is important during a turn because if you simply just downshifted without matching revs, the car will jerk, and that will cause weight to shift to the front of the car, and cause understeer during a turn(if you want to try it, try making a fast U-turn and then hitting the brakes during the U-turn... or better yet, put it into a lower gear and just drop the clutch). &nbsp;NEedless to say, understeer is no good when u are trying to go fast =P. &nbsp; So HEEL AND TOE is for track driving to effectively SLOW YOU DOWN and SMOOTHLY downshift to the next gear, so when u're coming out of the turn smoothly, you have a low gear with more torque/power to effectively use... its all about track driving. &nbsp;Go to a track driving school a few times and you will learn all the basics.

[LanceS13]

Good explaination M3...except for one thing.
If the car jerks forward on a downshift, weight transfer is towards the front taking effective grip from the rear wheels. &nbsp;It also causes the rears to turn slower than they should be, further causing the loss of traction. &nbsp;In the turn, this would cause oversteer. &nbsp;Depending on you situation, this could be helpful or catastrophic. &nbsp;If you push into the turn, I've found a slightly uneven rev-(mis)match can neutralize the car. &nbsp;However, if the car is already in a neutral state and the rev-match isn't on target, you could go for a nice little spin.

[M3l240sx]

Yep true true, BUT that is also assuming that the weight shifts RIGHT before you start turning (when the back is higher than the front losing traction in the back easier) &nbsp;BUT if you were doing it during a turn, it can cause the car to either lurch forward (pushing the fronts to lose and thus understeer) or lunge backwards, creating oversteer, so it all depends on the situation, to make a long story short, its not good to lurch either way.