DEZERTE

Im goign to sound dumb...but what is double clutching? and What is granny shifting? i hear these terms a lot but i have no clue what it means...all my friends i ask dont know either...so i thoght id ask
-Thx~

stickgoat

Granny shifting = slow shifting.

Double clutching is when you push the clutch in, put it in neutral, rev it to the rpms you'll be at when you shift, push clutch back in, complete shift.

Smoother shifts, but usually rather unnecessary.

Pinfield357

well the only reason i know what double clutching is is because i ahd to do it to get my car into gear untill i changed out the fluid but its puting in the clutch shifting to netral and leting the clutch out then puting it back in to shift into gear like usaull it matches the tranny speed and the engine speed better

DuX

two very fast and furious terms. I belive used in the same sentence by Vin Deisel. Very gay. But your question isn't and its been answered.

peacekeeper

Just for added effect, You Should under NO surcumstances listen to the "jargon" used on the fast and the furious. Granny shifting is actually just regular shifting.double clutching is just as Pinfield357 said. Also on another note, double clutching on a syncromesh gear box that you have does nothing unless your sycros are bad. If they are not bad the only thing you will accomplish is more wear on the clutch. double clutching was used in early transmitions like the old racing Ferrari's and porche's. It alows for smother upshifts on a ROAD OR OVAL Track. They will only make your et on a 1/4 Slower. the only time you need to double clutch would be on a down shift with your tranny, it makes it smoother. For most aplications, you shouldn't double clutch cause it is unnessesary. On a similar note, throttle matching on the regular road should not be done if you haven't had good practice, cause if you mess up, you can lose control and bad crapo happens in traffic. I'm not trying to sound like an ***, but I am trying to inform you with the best of my ability.
regards,
Charles

Rx-7Blazin

pinfeild do you own a manual if you are doing all that then you are compleatly defeting the purpus of double clutching. when you double cluch you put it in the gear you are supposed to be puttuin it in let of the clutch then push the clutch back in (keeping ont the gas) then let off again. i think that its kinda dumb you should just speed shift (dont let off the gas and just shift like normal just faster)

DEZERTE

haha thats funny..it was gay when he said "Granny shifting instead of double clutching like u should"

anyways thanx for the explanation it makes sense now
nice expl. peacekeepr

HIMNI Racing

Granny shifting, double cluching, ??????? to many people have seen that movie. (F&F) Do not go by anything they say in that movie! At one point they have 2 intercoolers their about to install in the supra it's all bs. You can granny shift (shift badly miss a grear etc.) you can also double chuch (ingauge disingauge reingauge) but all you will be doing is taking time off your ET. good luck.

i8acobra

double clutching, pish posh, the only thing it is SLIGHTY useful for is if you're under your power band and uncle bens performance is starting to come up, you can get it into the power band, but really, it doesnt too much, it isnt worth it...its just retarded ;-)

DEZERTE

lmao

Project84

Double clutching is something you do when you downshift(most of the time <-disclaimer) Gearboxes and Transmissions today have syncros that do all the work so you don't need to double clutch. Watching the Fast and Furious is misleading because you don't double clutch when upshifting like in a drag race. Go to the link down here and it will teach you a little about how the tranny works, what double clutching is, and how to do it.

Double clutching and syncros

darkwaveboi

DOUBLE CLUTCHIN IS SO FAST YO

MechE00

Again, never use F&F as a technical reference or as any kind of role model.

Double clutching is good for getting the car into first at autocrosses or for going from say 5th to 2nd on a roadcourse at the end of a long straight going into a tight turn (I am not a track person, that second part is not my first hand knowledge), when it takes a load off your synchros and improves your smoothness and when the extra time (not that much) doesn't matter because you're in the middle of braking anyway..

Other people are using the term "double clutch" as being the same as "dipping the clutch" or "slipping the clutch", but to motorsport people it's not the same..

When dipping the clutch, you keep the on the gas, and push in on the clutch pedal to slip it and allow the engine to spin faster than the transmission and get to its power band.. as one would expect, this is very hard on the clutch and not really a good idea unless you have tons of money to burn (if so, what are you doing driving a 10+ year old car?).

Double clutching is as was first described, and is an expanded rev-matching procedure-- simple rev-matching (e.g. heel-toe), matches the engine to the wheels and lets the synchros worry about the lay shaft, double clutching rev matches the lay shaft and the engine to the wheels..

(the fun with these terms is that one is often at least partially a subset of the other.. double clutching always includes rev matching, and often includes heel-toe.. but heel-toe doesn't necessarily include double clutching.. and rev matching doesn't necessarily mean heel-toe..)

You can't learn performance driving on the street.. find an autocross or HPDE near you for that.

Vroomaster

I thought granny shifting was when you shift before using all of your useful rpms (powerband). I guess it could also be slow shifting-ie my car from 1st to 2nd w/o a short shifter.

Blitz0309

My second gear syncro is shot, and i have been double clutching into second since i got my car.... but unfortuanetly its starting to grid when shifting into second...

sjordan

Should we tell him what Rev Matching is?

deadRX7Conv

Granny shifting is when you release the gas pedal to shift and take your sweet time with the shift lever. It doesn't make a difference whether it is at 2000rpm or 7000rpm. You usually also make sure that each gear is engaged prior to clutch release. Everybody on the street almost always granny shifts all the time.

Power shifting is when you leave the gas pedal to the floor(praying for working rev limiter), grabbing the next gear(preload before fully releasing clutch) as fast as possible, and then sidestepping(slam) the clutch pedal. If you break something, then you are doing it right.

Save double clutching for the mentioned excessive downshifting, for worn synchros, and usually for reverse. If anyone wants to learn how to double clutch correctly, go to a tractor trailer driving school/class. This is one reason why shifts seem to take forever in some trucks.

If you master the art of rev matching, you could make quick shifts without using the clutch(clutchless shifting). But, practice will cause lots of grinding and possibly parts breakage. Worn out clutches are great to practice clutchless shifting with. Rev matching along with double clutching will help with worn synchros.

Zach McAfee

my grandma drives an automatic

KiyoKix

For one granny's DON'T drive manual RX7's (well except 1 that I know who has a white '91 w/45k ORIGINAL MILES she won't sell to me grrrrr...).

But the point of this post is to say don't trust a movie that doesn't even display the rotary engine correctly (spinning the rotors backwards...how does that work?). If they don't even know which way the engine spins then...

3isacharm

alright, not to flame, but when you say it'll make autox and road course times faster, i think you've got doube clutching confused with heel and toe shifting. the both sound familiar though. hee and toe is used all the time by good drivers and helps balance out the chassis when going into a corner at a high speed. when you downshift have you ever noticed that lurch? hard to explain, but i'll try. clutch in, right foot on brake (toe) and heel of the right foot pops the gas to keep the car from lurching. hence heel and toe, but you can do it however you like,so it's comfortable. you don't have to necessarily use just your toe on the brake and just your heel on the gas,in fact you have to be pretty flexible to do twist your leg like tha. it also gets you in the right gear to exit the corner. it takes lots of finess with the clutch and hitting the gas just right so you don't bounce off your limiter. sorry to sound like the bastard who informs everyone out of nowhere. and you guys know that even though you rag on F&F, you still went to see it at least 3 times. again, don't mean to flame.

Pinfield357

i had to do this just to get the car into gear if i did not double clutch the synchros would just grind togather i know what im doing...

RylAssassin

WOW holy info, ill be honest i had no clue what double clutching was or heel and toe and ****, but now i have a few more rinkles in my brain! I never thought double clutching was so basic ive actually been doing that since i started driving stick(which was 3 months ago) and i now realize i started doing it without knowing.

RylAssassin

oh yeah and by the way F&F was a very good movie, I loved it but it lacked basic acting skills by most of the actors especailly that blonde dude. And if you guys watch the triple x movie that came out with vinny youll notice it has kind of the same tone and a lot of pointless acting in it like F&F. This is due to the fact that both movies were directed by that same horrible director...cant remeber his name though

Pinfield357

it was an alright movie i guess but it did kinda give import racing a bad image. and it lacked even the basic realness it was a cheap movie that they threw togather. they spent most of there money on pyro rather than actually building up some nice cars

3isacharm

oh well, as far as lustful entertainment goes, it's not that bad all of vin's movies have been like that. Pitch Black was even more geared towads blowing **** up. RYLassassin, it's not that easy, takes lots of practice, but definately a useful skill. i just explained heel and toe, don't see the point in double clutching, if you shift like mad fast yo, then why double clutch? anyway, glad i could help. p.s., paul walker is a tool