Double clutching???

3406 Views 15 Replies 10 Participants Last post by Shadohh, Aug 27, 2001

SuperScoupe

Discussion Starter · Aug 20, 2001

What was Dom talking about in Fast & Furious when he said, "Not double clutching like you should"?

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Visionz

· #2 · Aug 20, 2001

Basically, when shifting put your shifter in neutral first, raise the clutch a little, rev the engine to a higher RPM, then dump the clutch and shift in the next gear. That way, after shifting to the next gear, your rpm's will be near your peak power curve. <img src=icon_smile_big.gif border=0 align=middle>

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cougart

· #3 · Aug 21, 2001

In all honesty I havn't seen the movie yet just cause I heard parts were unrealistic, so I guess Lo&Show handled this one right

2001 Tiburon
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skierd

· #4 · Aug 21, 2001

I thought double clutchin is what people would do in the old days before synchros, or something. Push the clutch in, pull into nuetral, pull out clutch, push it in again, shift to next gear, and then release the clutch again. Its what you have to do with dog cut gears that don't have synchros. I read in a recent SCC in an article about their subaru Impreza project car. They changed to dog cut gears for a stronger tranny, but since the gears are bigger, there wasn't room for the synchros, so they went into an essay on clutchwork.

<img src="http://www.hyundaiwrc.com/action/photos/thumb/McRae_Shakedown_TNL.jpg" border=0> <img src="http://www.hyundaiwrc.com/action/photos/thumb/bat_hyundai1_sm.jpg" border=0> I love rallies. <img src=icon_smile_big.gif border=0 align=middle>

TRSCobra

· #5 · Aug 21, 2001

Double clutchin it is HARD! I tried to do it in my friends 88 nova (riced out bad)<img src=icon_smile_tongue.gif border=0 align=middle> and i always screw it up... So i just rev while the clutch is in and im in between gears.

cougart

· #6 · Aug 21, 2001

there was a site that had a huge article on this, going to go find it now

http://www.happytogether.com/318ti/notebook/shifting/index.html

here is what is says about double clutching

DOUBLE CLUTCHING:
There are *three* separate spinning entities that need to be coordinated when shifting: The engine. The transmission input. (I'm going to refer to this as the intermediate shaft). The transmission output (which is directly related to the vehicle speed).

When the clutch is disengaged (pedal pushed down) and the transmission is in neutral (such as when shifting between two gears), the intermediate shaft is essentially free spinning. In normal shifting, we rely on the synchro's to control the speed of the intermediate shaft as it engages with the gears connecting it to the transmission output.

Decades ago, transmissions didn't have synchro-mesh. (Many large trucks still don't). On these transmissions, it is necessary for the driver to manually control the speed of the intermediate shaft so that it matches the speed of the gear to be engaged. This is done by the following process when shifting from one gear to the next:

1) Power is removed and clutch is disengaged (pedal down). 2) Transmission is shifted from original gear to neutral. 3) Clutch is re-engaged (pedal up). (Driver now has control of intermediate shaft speed by controlling engine speed). 4) Driver 'blips' throttle to match intermediate shaft speed to speed of new gear. (This takes practice to get the right match). 5) Clutch is disengaged (pedal down). 6) Transmission is shifted from neutral into new gear. 7) Clutch is re-engaged (pedal up) and power is applied.

Steps 1 - 3 can be done casually or quickly. Steps 4 - 6 *must* be done quickly so that the intermediate shaft doesn't slow down again before it's engaged. If step seven is also done quickly, the engine will also be 'rev-matched' to the rest of the driveline so that engagement will be smoother.

2001 Tiburon
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Random

· #7 · Aug 21, 2001

Double clutching is also done when "heel toe" downshifting(just leave the clutch in). By matching Tranny speed to engine speed to wheel speed, the car does not "lurch" when you go down a gear.

When double clutching and heel/toeing, it is damn hard to get right, but once you get it right, you can shift so silky smooth, and you will find yourself doing it automatically.

Leave it to Random to Needlessly complicate things.

cougart

· #8 · Aug 21, 2001

brendan, i use the heel/toe method all the time, i didn't realize that was considered double clutching also, learn something every day i guess

2001 Tiburon
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Alpine cd player
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Random

· #9 · Aug 22, 2001

Brendan??? Random looks around some....

Double Clutching IS different than Heel/Toe. You can add double clutching TO your normal Heel/Toe driving, or do it by itself. But in most circumstances...to double clutch effectivly, you HAVE to heel/toe or have 3 legs.

Leave it to Random to Needlessly complicate things.

4doorGL

· #10 · Aug 22, 2001

<i>imagining Random double clutching, looking like a dancing ballerina</i>

<img src=icon_smile_tongue.gif border=0 align=middle><img src=icon_smile_tongue.gif border=0 align=middle>

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I drive a slow car.
0 to 60 in 11 seconds (look out!)

Decrum

· #11 · Aug 22, 2001

Well, with a long shift, like the one I have on my Accent, double clutching is a pain, because the shift from neutral to second isn't always smooth. However, with a much smaller more precise shift, one can more easily do it, by quickly pressing and releasing the clutch twice while shifting. Done really quickly the shift and the clutching should come out in unison. I've tried it, and I noticed less squeal between first and second.
Peace
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cougart

· #12 · Aug 26, 2001

what do you mean less squeal? tire squeal?

2001 Tiburon
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Alpine cd player
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Visionz

· #13 · Aug 26, 2001

If you have tire squeel, then you're just giving it too much gas when letting out the clutch. <img src=icon_smile_blush.gif border=0 align=middle>

JGraham9382

· #14 · Aug 26, 2001

<BLOCKQUOTE id=quote><font size=1 face="Verdana, Arial, Helvetica" id=quote>quote:<hr height=1 noshade id=quote>imagining Random double clutching, looking like a dancing ballerina<hr height=1 noshade id=quote></BLOCKQUOTE id=quote></font id=quote><font face="Verdana, Arial, Helvetica" size=1 id=quote>

LOL <img src=icon_smile_big.gif border=0 align=middle>

JGraham9382
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cougart

· #15 · Aug 27, 2001

ok, thats what I thought you meant low&show

2001 Tiburon
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Shadohh

· #16 · Aug 27, 2001

I believe the Rally Tiburon, rated at some 370HP Runs dog gears, so I guess they double clutch! Now that must be hard!

Double clutching, with a 370hp engine not ment original designed for that kinda power, going through a transmission bandaid for that kinda power, being put to 4wheels, in a car not ment for awd, all the while in the mud, going 80+mph trying to beat that damn ford focus and WRX !

yet they still win

<bumper sticker> "Honda inside! I eat them everyday for breakfast"

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