My friend drives a 93 nissan 240sx and his father was teaching him how to double clutch and when i asked him what it was he couldnt explain it to me. so i was wondering if anyone knows exaclty how to do it, and what it does for you??

 

I could be wrong but I think it is when you are in a gear you press the clutch in once put the car in neutral. Let the clutch out. Then press the clutch in again and put the car in gear. You would use this if you had a bad syncro or something like that.

 

when i learned how to double clutch it was becasue i was learning how to drive a tractor trailer. i don't knowwhat the benefits would be to double clutch in a car.

but yeah, the guy above me posted correctly.

 

just because vin desiel said that it was a good thing to do in fast in the furious doesnt mean that it works. i have done it and cant tell a difference in speed shifting or double clutching.

 

Double clutching is best used for downshifts so you don't get that huge jerk. I don't "double clutch" as they call it. I just depress the clutch, put the car in nuetral, rev the motor to the desired RPM range, and then put it in gear and go. It's a nice smooth acceleration instead of the jerk you would get from downshifting and dumping the clutch.

That's just my opinion and how I like to drive my car.

 

^ You can just rev match its much easier. Thats what synchros are for

 

1. I dont see how your cars make and model is revelent to this post, unless you said; Mack truck, international 18 wheeler, big rig, etc..... It doesnt matter

2. The second post of this thread answered everything you need to know about double clutching. the third post of this thread explaines when you would use it.

3. Stop mis inturpetering FnF quotes, tear down your paul walker poster, take all those stickers off your car and learn how to drive it.

4. Search or be Flamed.

 

gracias

 

Double de clutching is a technique most often used by road racers. By engaging the clutch in neutral and then blip to rev match you also bring the transmission up to the correct speed for the shift and hence, as Danno pointed out, conserve the syncros.

Once practiced it becomes second nature. I don’t think about it anymore -- it is just part of my downshift. It can be very helpful thing to know when driving older cars (classic Ferraris for example ) as they can be very difficult to shift without this technique.

Many people consider it stupid because they can't do it. It is a purer technique, albeit old school, and is kinder on the equipment. It definitely wont hurt anything to learn that way!

 

There's really no need for double clutching on any relatively modern cars equipped with synchros. Let the synchro do the matching, you'll spend less time out of gear. As for jerking on downshifts...if your car jerks then you're probably dropping into too low of a gear with too high an RPM load. Listen to Danno and go far.

 

That's what heel-toe is for.

Rev-matching on a down-shift is the right way to do it, no matter how you look at it. It's much easier on your clutch, but takes a bit of practice to do it. The more practice, the less time it takes to the point where you can downshift naturally with rev-matching.

Heel-toe simply lets you do it while braking, but there's nothing like the feeling of a perfect heel-toe!

 

You're forgetting about the input shaft. Double clutching is the only way to rev line it up with the gear/synchro/mainshaft/flywheel before you shift into gear...

 

I guess half of you people don't race your car at the track.

ex: you're going 120mph on a straightway, and you are coming upon a very sharp curve, you need to reduce speed, but you have to prepare for exit off the curve as fast as you can.

Now, if you're going 120mph and you try to downshift because "you don't need to use your syncros on a modern car" your car is going to be out of control. Your steering will steer itself and you wont have enough control or even possibly brake your modern syncros and everything else in the car.

That means, 4th gear redline to 2nd gear for the exit.

So by double clutching, you are downshifting the car much more smoothly, faster and in control.

most drivers I know will double clutch, toe and heel to 3rd then 2nd. Then trail brake for a bit then take off after you hit the apex.

That's why you use it.

For auto-x, I use it once in a while if the course is fast and I'm on 3rd.

On daily driving, I could take off faster after downshifting and I could downshifting faster without riding the clutch.

but on your daily cruise, you don't need to use it. some of us just use it because it's embedded on to our driving system.


and no, you don't double clutch on drag racing. there would be no point, unless you screwed up and shifted to 4th, when you're suppose to shift into 2nd.

by that point you're screwed anyway, why bother?

 

yeah i double clutch and i heel/toe all the time for daily driving. i dont know why, its become 2nd nature to me and i cant live without those techniques. everyday, i thank my bf and tsuchiya for passing on this skill to me.

edit: crap me i didnt realize the freaking thread is like a month old. sorry guys!

 

what's the difference between double clutching and rev matching? some of the descriptions got me a little confused