Double clutching???

[SuperScoupe]

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

[Visionz]

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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<img src="http://www.fxtreme.org/members/2000Lo&ShowTibby/loandshow.gif" border=0>

2k Low....if you don't have air..it ain't low enough...

"I live my life a quarter mile at a time..."

[cougart]

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
Black with Blacked out windows
Alpine cd player
More mods to come slowly

[skierd]

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]

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]

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
Black with Blacked out windows
Alpine cd player
More mods to come slowly

[Random]

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]

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
Black with Blacked out windows
Alpine cd player
More mods to come slowly

[Random]

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]

<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!)