Thrillhouse

what do they do and how do i do them?

lsteggy

a revmatch is when your downshifting and you try to match your rpm to the gear you are down shifting to. it puts less stress on the clutch

double clutching is when your spinning out really bad. you push in the clutch and let it out again so that you grip and go.

this is what i believe them to be

dLo GSR-stolen-now-WRX

negative.

If you have no synchromesh (Crash Box City): You are loafing along in Third gear and want to change to Second gear. When you put in the clutch and change the gear selector from Third to Neutral, the layshaft is going a particular speed that matched Third gear at the present road speed. If you do not change your road speed (your brakes are broke, say), the layshaft is going too slowly to match Second gear. (Sound familiar so far?) As you approach the Second gear selection, the gears go GRAUNCH.

What should you have done? This:


Push in clutch Layshaft equals Third gear speed

Select Neutral Layshaft coasts

Let out clutch Layshaft equals engine speed

Blip throttle Engine and layshaft speed up to Second gear speed and a
little

Push in clutch Layshaft coasts

Select Second No GRAUNCH if you have the speeds right. Ideally,
layshaft has coasted down to exactly Second gear speed

Let out clutch System is all locked up in Second.

This is double-clutching. It INCORPORATES rev-matching, or there is no point in doing it. Therefore, in my opinion, there is no reason to have to say "rev-matching" to describe this process. The rev-matching is the tricky part. How high do you rev it? Experience is the only teacher.

Does double-clutching do any good if you have a synchromesh box? Yes, it makes the synchros work less hard than they were designed to, so they will last longer. The synchros will make up for any errors.

LOwrestling2001

yea, but nowadays, when they heel toe...they just single clutch it so it's a lot quicker...since u got synchros mite as well usem

dLo GSR-stolen-now-WRX

yeah, double clutching is futile nowadays with synchros... despite what vin diesel says

taylor_durdan

1)why is everyone so damned concerned with double clutching on this board?

2)does noone use the search button?

GSRwBOOST

[QUOTE]1)why is everyone so damned concerned with double clutching on this board?

QUOTE]

It's the Fast and Furious thing to do..... kinda like JDM, Altezzas and VTEC... overplayed....

au-gsr

without the fast and the furious what would all these ricer kids be doing with their cars? god i couldn't imagine, ****** trend setting movies. die ricers die

B2FiNiTY

iTrader: (2)

They would still be doing what they are doing. LED nozzles, hyper green light, glow kits. All these things have been going on since forever.

RedGSR

double clutching is still needed when the speed/rpm difference is too big. Try shifting to 1st while going 20mph when your rpm is at 800rpm. Your synchronizer will not make it.

doing double clutch while heel-toe will save your sychronizer.... since i do heel-toe during daily driving, I always double clutch.

shattergsr

what is it called when you are say going 40 mph in 3rd and your coming to a stop sign, sometimes I'll downshift into third and let off the clutch a little to help me stop + brakes then same with 2nd and then just completely brake to a stop and go from either 1st or 2nd....is there a technical term for this? I had heard this wears your clutch down so I just coast in neutral and brake these days.

dLo GSR-stolen-now-WRX

double clutch is not needed for heel-toe at all.

and why would you ever want to shift to first from anything but a 5 MPH roll?!?!

dLo GSR-stolen-now-WRX

never do that. it'll **** up your clutch in no time, yu're making the synchros and the clutch do all the stopping work and you're wearing it down pretty quickly. my cousin did this allt he time in his probe. i always wondered why he'd gone through 3 clutches until i saw him drive

ingrate

i thought 1st gear did not have a synchronizer

RedGSR

You will want to do double clutch in heel-toe. You don't have to if you don't care about your tranny. And you will want to downshift to 1st above 5mph when you need some good acceleration especially in our B18C without much low end torque.

Sychronizer does the job most of the time, but it doesn't mean that's magic and you don't need to do double clutch ever again. Youwon't need it for upshift, but for downshift, you better do it.

GSRaCeRbOI

its called wasting money.... brake pads are cheaper than clutch and transmission..

GSRwBOOST

It's called "prematurely wearing out your clutch"....

What doyou want to replace..... 400 dollar clutch kit or 40 dollar break pads??

PatrickGSR94

iTrader: (1)

Any tight corner in an autocross where you get down below 20-30 mph... yeah you're gonna need first gear. I went into 1st around all of the 180's on the last course I ran on.

YadinP

I heard this from a friend today (thanks Junier). I can't believe I didn't find this out sooner So it's OK for me to roll in neutral while stopping? The ONLY reason I wasn't doing this is because I was told not to by my "driving instructor" (lmao, that would be my brother, when he was teaching me how to drive manual). Please let me know so that I may scream at him later.

allenp

Yes, but why? Don't do either of these things:

1) Use the clutch to slow the vehicle. WAY too much unecessary wear on an expensive, hard-to-replace part.

2) Put the car into neutral while braking to a stop. Why? Because if you leave the car in-gear, then the engine will help the brakes in slowing the vehicle. You can leave the car in-gear until the engine reaches idle speed, at which point de-clutch and brake to a stop. Or, downshit into the next gear, rev-match the engine to the new gear, and re-engage the clutch to continue the engine braking.

It drives me nuts when people push the clutch and brake in simultaenously. There is no need, you're just taking your engine braking out of the equation.

allenp

Why not? Any driving technique developed in racing usually aids in overall car control.

I enjoy a good double-clutch downshift. A perfectly executed heel-toe double-clutched 5-2 downshift is fun and smooth, not to mention easy on the car.

n1ek

so you actually put the clutch in twice when you heel and toe?
i would hate to see your cornering times. lots of work to not gain anything of a factory tranny. are you sure you're not putting the clutch in only once.?

AlterEgo

You heel and toe AND Double clutch ? Daily ?

ee-gsr

my tranny doesn't let me enter the 1st gear gate if i'm going faster than like 5mph. do u guys just force it in then???

allenp

Double clutching will allow you to more smoothly shift into 1st while moving.