What the hell is double clutching?

[88 Fox GT]

A friend bought the 2Fast2Furious bonus DVD, and in the extra they showed you how to drive like a "pro". The demostrated what they called double clutching and is was what Mustang guys call powershifting, Shifting thru the gears at WOT while using the clutch.

LMFAO.

 

[Michael Yount]

330 - if it's not grinding, you're not hurting anything. And you're saving wear/tear on the clutch, cable, throwout bearing. As long as you're not grinding gears when they engage, it's easier on the equipment to shift it without a clutch. It will actually make you very smooth with your movements in the car.

I once lost the clutch on the starting grid of an SCCA race. WE bump started it in gear and I ran the whole race with no clutch - paying careful attention not to spin it and kill the motor. Finished the race (won my class!), did 1 cool down lap, drove it off the track, through the pits and right up onto my trailer which my buddy had prepared for the event while I was in the race.

 

[notchback]

yeah it's to synchronize the gears on a big truck or very old car

why they put that line in the movie is beyond me....of course their use of nitrous oxide like it's an afterburner on an x-wing fighter is a little out of whack too

 

[notchback]

Michael.. do you know if there are any long term damages that could occur from clutchless shifting? .

sorry for the dp...

dude you can't hurt anything..unless your grinding it into gear...
i used to drive a peterbuilt and freightliner to move our excavator, and they shifted ez'er w/out the clutch than with it.

less wear and tear..just gotta get the hang of it...driving a truck aint ez i'll tell you

 

[88_GT_5_oh]

With a little experimentation, you can sort of get a feel for what it was like by shifting without using the clutch at all. Wind first out to about 2500 rpm, then when you ease off the gas pull it out of first (no clutch), and just apply steady pressure into second. When the gear and engine speeds match, it'll lightly 'clunk' into the next gear. You should be able to do that all the way through the gears. Same is true downshifting - but you have to blip the throttle in neutral and then apply a little force into the next lower gear. When the engine speed is dropping back down from the 'blip', as soon as the engine and gear speeds match, it'll drop into the next lower gear. It works better on higher mileage trannys where the gears/synchros have lots of wear on them.

when i first bought my car my uncle wanted to drive it, so i let him and he showed me how to shift without the clutch, when he did it it sounded like an automatic. it was so smooth and no crunching at all. when i did it i heard a loud clunck and got scared to do it anymore, now i can do it pretty good.

 

[Killer50stang]

"Granny Shifting, not double Clutching like you should" is the stupidest line in any movie...especially since the car he's talking about is a GS Eclispe...not a semi. Double clutching is...press the clutch in, put it in neutral, let the clutch out, then push the clutch in again to shift it in gear. I guess Vin didn't know that but somehow his car ran 10 secs. Oh and my floor board always flies off when when my piston rings fry. And after my rings are fried I can still drive the car as if nothing ever happened. Dumbest MOVIE ever!!!

 

[88_GT_5_oh]

i was asking my dad about it and he said the old trucks he used to drive way back in the day, and same with my grandpa, you had to do the double clutch thing, nowadays you can just bug ricers with the line when you walk all over them

"what you weren't double clutchin?"

 

[Michael Yount]

We just got back from dinner. On the way to the restaurant a compleletly stock mid 90's 2dr Civic coupe came blowing through a yellow light. It was extremely loud - evidently no muffler at all as opposed to a 'can'. As it went buzzing by, my wife just started laughing. I said "what's so funny?"

She composed herself - and replied "All that noise - and the poor guy doesn't even have the requisite hang glider wing -- it's just so sad..."

 

[88_GT_5_oh]

We just got back from dinner. On the way to the restaurant a compleletly stock mid 90's 2dr Civic coupe came blowing through a yellow light. It was extremely loud - evidently no muffler at all as opposed to a 'can'. As it went buzzing by, my wife just started laughing. I said "what's so funny?"

She composed herself - and replied "All that noise - and the poor guy doesn't even have the requisite hang glider wing -- it's just so sad..."

its awsome when the women get in on the laughing at the ricers

 

[shonoff]

"Granny Shifting, not double Clutching like you should" is the stupidest line in any movie...especially since the car he's talking about is a GS Eclispe...not a semi. Double clutching is...press the clutch in, put it in neutral, let the clutch out, then push the clutch in again to shift it in gear. I guess Vin didn't know that but somehow his car ran 10 secs. Oh and my floor board always flies off when when my piston rings fry. And after my rings are fried I can still drive the car as if nothing ever happened. Dumbest MOVIE ever!!!

I thought that when he was almost blowing the welds on his intake is when his floorboard fell out.That could be why my old cars seats went through the floor.And all this time I thought it was just rusted out.

 

[Drew_Carroll]

I know its just a movie but after his diamond plate floorboard fell out, I guess thats what happens when you hit the extreme speeds (90mph) in an eclipse. But the vin diesel jumps in the car acting like its all good, was he Fred Flintstoning that thing? He kept his legs tucked up? I just dont know

 

[Klunky]

With a little experimentation, you can sort of get a feel for what it was like by shifting without using the clutch at all. Wind first out to about 2500 rpm, then when you ease off the gas pull it out of first (no clutch), and just apply steady pressure into second. When the gear and engine speeds match, it'll lightly 'clunk' into the next gear. You should be able to do that all the way through the gears. Same is true downshifting - but you have to blip the throttle in neutral and then apply a little force into the next lower gear. When the engine speed is dropping back down from the 'blip', as soon as the engine and gear speeds match, it'll drop into the next lower gear. It works better on higher mileage trannys where the gears/synchros have lots of wear on them.

Yep. I used to have a '73 fullsize Blazer with an SM465 4-speed...with the granny gear. I have a steel plate and a bunch of screws in my left ankle, so when I got tired of using the clutch, I just wouldn't. Always amazed my friends.

 

[crazypete]

I live life a 1/4 mile at a time

Great great line. TFATF was a movie for dumb kids but it had it's moments. It honestly changed my life. See, I had hung up the wrench and decided to just retire from monkeying around with cars. Then I saw that movie. I sold my saab and bought my second mustang 1 week after. Reminded me how much I missed being a gearhead.

That movie wrecked autozone though. Now theyre ricerzone.

 

[BlackGT89]

Shifting without a clutch is asking a lot of the syncronizer rings. Even though I've done it I don't plan to make a habit of it.

When I think of needless double clutching I think of the movie Bullitt. I loved the movie and Steve McQueen and his Mustang. All that double clutching did make for good sound effects, but probably not really necessary...

 

[Michael Yount]

blackgt - you've got it backwards. THe synchros do more work when shifting with the clutch. Thats because its the rings that synchronize speeds and allow gears to mesh. Without the clutch you have to let the speeds match and then the gears can mesh. The synchros do very little work when shifting without the clutch.

 

[I_AM_CANADIAN]

blackgt - you've got it backwards. THe synchros do more work when shifting with the clutch. Thats because its the rings that synchronize speeds and allow gears to mesh. Without the clutch you have to let the speeds match and then the gears can mesh. The synchros do very little work when shifting without the clutch.

I find that when I shift without my clutch, i will "misrev" it and will do a slight grind. So it probably isn't the best for it. But maybe thats just me.

 

[Michael Yount]

yup - if you don't match the speeds just right it will either grind, or not go in at all.

 

[z9_87]

yup - if you don't match the speeds just right it will either grind, or not go in at all.

Now I don't have a manual nor do I have a lot of experience with one so I may be missing something but how do you know when the tranny and engine speeds are the same to put it in gear. Especially on the downshift where you said you have to tap the gas quick to get the revs up to the same speed as the transmission.

 

[Michael Yount]

You know after the fact - if it went into gear - they matched. If it didn't, they didn't.

 

[HISSIN50]

Now I don't have a manual nor do I have a lot of experience with one so I may be missing something but how do you know when the tranny and engine speeds are the same to put it in gear. Especially on the downshift where you said you have to tap the gas quick to get the revs up to the same speed as the transmission.

for me, it comes down to 'feel' and 'ear'. a feel for the car, trans, gear gaps, shift points, etc and listening (i cant look at the tach to figure out anything - all about sound).