Zach McAfee

Yeah, I was avoiding the flamage by saying my grandma drives an auto, but I thing the granny shifting BS is over with. Now, on with the flaming, double clutching is what truck drivers (ya know, like the big trucks) do. If you ever double clutch your car, especially an RX-7, I will track you down and destroy you.
& also, I watched F&F about 3X at the theatre and 10X elsewhere. But I still think it sucks
Vin Diesel is the man.

chrismckinless

Dont double clutch. There is a reason your transmission has synchros. I remember a conversation I had with a "friend" of mine that went like this:

Him: "Yea, so I am going to go try out for Ford Racing, they supply the cars, so Ill go out and show them how I heel-toe downshift and double clutch"

Me: "I didnt know Ford Racing raced 1950's tractors"

You arent going to find any transmission that needs to be double clutched unless you find some rediculous mode of transportation from 5 decades ago.

Even if your synchros are shot, if you simply match the wheel speed to engine speed for whatever gear you are going into, the shifter will fall into place. I shifted my old Prelude like that for fun and didnt even have to use the clutch.

Chris

MechE00

Heh.. an autocrosser who is a lot faster than me said once, "Treat the gear shift **** like it's an egg.. you don't want to break the egg.." Basically, if you are doing things right, you don't have to push that hard on the shift lever, and if you have to push hard, chances are you are asking a lot of the synchros.

If you are at 20 mph and want to get into first gear on an autocross course (because you'll be down to about 10 by the time you finish braking and you need torque out of the corner), you're not likely to get there without breaking the egg.. --unless you double clutch.

Double clutching is superfluous for street driving, and it puts more wear on the throwout bearing..

DEZERTE

rofl

Zach McAfee

I'll have to try that next time. I would have had scrambled eggs everytime I went to the track.

I still dissagree with you on the dbl clutching. In the 2nd to 1st scenario, if you apply firm pressure to the shifter, your right, it's not goin anywhere. But, if you bring the RPMs close to where it should be it will slip into 1st with the same pressure. Hence the heal-toe shifting method, of which I am yet to perfect, if such perfection exists...

Give it a shot today. At about 15-20 mph in second, apply normal pressure to the shifter (clutch in of course), then bring the RPMs up and it should slip in place. If it doesn't, I'll eat my words. Even I am wrong sometimes.

Likewise, I'll try the double crunching method and see how that goes.

3isacharm

McAffee, i just wish they would've raced the skyline, everyone knows that was one of the faster cars in the movie, too bad it was relegated to radio control. also, next time make the rx7 a little faster please.

$100T2

iTrader: (1)

My granny rocks the B&M in her blown Camaro... She rules!

MechE00

The point of doing the rev matching with the clutch engaged (foot off the pedal) is to spin up the lay shaft. That is also what the synchros do.

The clutch connects the engine to the layshaft, the gear selector decides how the lay shaft connects to the wheels (simply speaking). When you put the gear selector in neutral, the layshaft is no longer mated to the wheels and spins freely, idling down to a stop (if the clutch is also disengaged, otherwise it spins with the engine RPM). When you select a new gear, the lay shaft needs to be spinning at the right speed before it can get into that gear, so the synchros spin it up. If the speed difference is quite large (between the current layshaft speed and the speed it needs to be for that gear), it puts more wear and tear on the synchros and gives resistance to your hand as you try to move it into the proper gear.

So if you know you're setting up for a large speed difference that would otherwise put a heavy load on your synchros, you can connect up the engine to the layshaft (via the clutch, while the selector is in neutral), and use engine to spin it up. This eases the load on the synchros, and makes the gear shift lever move in much more easily (if you do it perfect, it practically feels like it is "sucked" into gear, but that's rare for me).

If you do as you say, and leave the clutch pedal pressed in, and put normal pressure on the shift lever, yes, it will eventually move into gear as long as your synchros work.. but it's generally quicker and smoother to blip.

A peripheral advantage to being in the habit of double clutching big downshifts is that you're not likely to force the gear lever anywhere.. so you're less likely to jam the selector into the wrong gear and over-rev your engine (say if you missed a 5-3 downshift for a 5-1).

Again, there's no need to double clutch on the street.

dr0x

Be happy he didnt say "how i heel-toe up shift and double clutch"

Bigretardhead

double clutching sounds very cool. Ever seen "bullit" where the dude in the mustang races the charger? He double clutches the mustang and its the best sounding thing in the world!!!

TommyTheCat

Im just pissed because I want a 240sx, and TF&TF2 is going to star a Skyline and other 240sx's. God damn it...better buy one before July next year...

guygordon

In the UK it is called, "double de-clutching."

I double de-clutch and fan the clutch by force of habit after years in Formula Ford. It makes a difference, when downshifting a cold gearbox through the intermediate gears.

I have 171,000 miles on my 1987 Sport FC, and I am on my second clutch with virtually no synchro wear.

Power shifting is good for straight-line performance. Double de-clutchin is good for road courses and especially when skipping gears.

sbertolone

clutchless shifting is the way to go ya it takes time but once you learn its easy and the only time you use the clutch is when leaving from a stop or a slow roll