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Tsuioku | Posted: Nov 24 2002, 04:50 PM |
Unregistered | The Topic says it all...... What is Double Clutching?? and how do you do it?? I remember hearing it from Fast and the Furious..... Does any char from ID ever do it?? |
GoFastLookSlow | Posted: Nov 24 2002, 04:59 PM |
♪ don't say lazy ♪ Group: Members Posts: 170 Member No.: 86 Joined: Nov 17th 2002 Location: Update Profile | Double clutchin is a technique originally created by truckers with bad synchros. It involves engaging the clutch for a downshift, disengaging it halfway through the shift, then engaging it again aand finishing the shift. It should never ever be used by a person serious about racing. |
ImprezaSTi27 | Posted: Nov 24 2002, 05:59 PM |
IDW Prime Member Group: Advanced Members Posts: 650 Member No.: 101 Joined: Nov 20th 2002 Location: San Diego, CA | Dude you didn't know? That's why you lose the drags...granny shifting when you should've been double-clutching. Either by an inch or a mile, a win's a win. I live my life one Nos bottle at a time. I'm fast AND furious. jk Alex |
zster | Posted: Nov 24 2002, 06:21 PM |
Unregistered | double clutching is used to downshift with cars with either bad synchros or no synchros. the technique entails depressing the clutch, put the gears into neutral, let go of the clutch, match rev, depressing the clutch again, downshift then match rev and release the clutch. the reason to do this is that if you downshift with a car w/ bad synchros or no synchros you will get your gears to grind as you downshift. the match rev in the middle lets your downshift smoothly. if you go to racing schools like skip barber, their open wheel cars do not have synchros so this techique is important. sometimes if you want to downshift to first gear, doing this would be useful too. |
Tsuioku | Posted: Nov 24 2002, 08:27 PM |
Unregistered | Thanx peepz... I understand the concept now... But another Q arises now...... What is synchros?? What are some cars w/ synchros?? w/o synchros?? |
karasac | Posted: Nov 24 2002, 10:11 PM |
Rotary Disciple Group: Advanced Members Posts: 2,209 Member No.: 11 Joined: Aug 28th 2002 Location: Chino Hills, California | i know what it is but i cant put it into words so here ya go : http://www.howstuffworks.com/transmission4.htm i love howstuffworks.com |
Perry | Posted: Nov 24 2002, 10:28 PM | ||
Like an eagle! Group: SITE OWNER Posts: 8,014 Member No.: 1 Joined: Sep 15th 2002 Location: San Leandro, California | For the people that are too lazy to click the link, here you go:
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Proud Contributor of the Music Section Revival Project |
Indecisive | Posted: Nov 25 2002, 04:57 PM |
the deranged one Group: Advanced Members Posts: 5,132 Member No.: 34 Joined: Oct 1st 2002 Location: Vancouver, Canada | you usually double clutch before going through a corner to keep your revs up or something like that..I could be wrong. when you're shifting you're supposed match your revs wif you speed neways so bad syncros shouldn't be a problem if you know how to shift. |
]{aya | Posted: Nov 25 2002, 05:05 PM |
Old HOT PINK Schmuck Group: Advanced Members Posts: 841 Member No.: 47 Joined: Oct 16th 2002 Location: Montréal, Québec | rally cars are not syncronized hehe, when the driver wants power he goes and get it ...rally is so nice ! |
Indecisive | Posted: Nov 25 2002, 05:09 PM | ||
the deranged one Group: Advanced Members Posts: 5,132 Member No.: 34 Joined: Oct 1st 2002 Location: Vancouver, Canada |
man..I love when they do a lil smaller shot of the feet/pedals while they're driving. it's friggin crazy. omg...I never knew somebody could have so much control...damns. | ||
ImprezaSTi27 | Posted: Nov 25 2002, 07:41 PM |
IDW Prime Member Group: Advanced Members Posts: 650 Member No.: 101 Joined: Nov 20th 2002 Location: San Diego, CA | A lot of current rally cars in the WRC have semi-automatic sequential shifters. Sequential in that you can't jump straight from 4th to 2nd without passing 3rd also, therefore there's only a lever for upshift and downshift. And in acceleration the transmission works as a racing automatic, so the clutch is only used when the rally driver downshifts. Alex |
Fresh | Posted: Nov 25 2002, 08:18 PM |
Unregistered | I think double clutching can done without using the clutch by simply shifting out of gear to neutral, matching revs and then shifting down or up. It can actually be better for the car than using the clutch to shift if you know how to time it correctly. |
Indecisive | Posted: Nov 25 2002, 08:54 PM |
the deranged one Group: Advanced Members Posts: 5,132 Member No.: 34 Joined: Oct 1st 2002 Location: Vancouver, Canada | ...if you do that then you screw up your clutch plate. and if you can't get the timing right you'll grind your gears like crazy. this is a REALLY bad idea. |
Fresh | Posted: Nov 25 2002, 09:17 PM |
Unregistered | i know a lot of race car drivers do it because it saves time and if you know your car well enough you should be able to do it smoothly |
breeze | Posted: Nov 26 2002, 11:09 AM | ||
IDW Member Group: Members Posts: 25 Member No.: 92 Joined: Nov 18th 2002 Location: Update Profile |
Yeah, there was a topic like this in the Celica Forums I check out, awhile back. they came to an agreement that the technique you're talking about is "rev-matching" so you can keep your Revs high so you don't lose speed coming out of the corner. funny thing is. no one there could agree what the exact term for double clutching was... | ||
Indecisive | Posted: Nov 26 2002, 04:48 PM | ||
the deranged one Group: Advanced Members Posts: 5,132 Member No.: 34 Joined: Oct 1st 2002 Location: Vancouver, Canada |
a lot of race car drivers now dont' use stick shift at all nemore. they use the electronic system like for ferrari or bmw with the paddles behind the wheels. that's where a clutch is not necessary. and wif the bmw system. the SMG 2 system also double clutches automatically. so it's like a semi automatic transmission...what I like to call an automatic manual transmission heh. BMW is thinking of putting this system in the new bmws. it has been race tested for a long time in their M3's now. http://www.bmwclub.org.hk/smg2.htm there's some info on the SMG 2. | ||
Fresh | Posted: Nov 26 2002, 05:49 PM |
Unregistered | i'm talking abotu before SMG's |
tofu boy | Posted: Nov 27 2002, 12:04 AM |
IDW Senior Member Group: Members Posts: 89 Member No.: 55 Joined: Oct 22nd 2002 Location: Update Profile | the M3 SMGs are "supposed" to be faster than manual or so they claimed. it uses electronic rev-matching to keep up eves when u down shift in turns. I whish i could try it someday cause everyone says is so good |
ImprezaSTi27 | Posted: Nov 27 2002, 12:39 AM |
IDW Prime Member Group: Advanced Members Posts: 650 Member No.: 101 Joined: Nov 20th 2002 Location: San Diego, CA | You can also perform a "perfect launch" with the BMW SMG system, only once every 24 hours I think, and 10 times during the life of the clutch. But I hear the time it takes to shift is in miliseconds, which is pretty cool if it's true. Alex |
SupahNewbie | Posted: Nov 30 2002, 01:48 AM |
Request Title - PM Mods Group: Members Posts: 422 Member No.: 100 Joined: Nov 20th 2002 Location: Update Profile | Yeah but you got to replace and I'd rather have something take a bit longer but I can use for over 5 years of my life then to use something a bit faster for 2 weeks of my life |
Indecisive | Posted: Nov 30 2002, 12:19 PM |
the deranged one Group: Advanced Members Posts: 5,132 Member No.: 34 Joined: Oct 1st 2002 Location: Vancouver, Canada | I don't think you wanna have to replace any bmw part. I have an E30 325i and it costs me a bundle if I need to bring it into the shop to repair. and for newer bmws I'm sure it'll be 10 times more than what I'm paying heh. and esp cuz it's a special transmission system it'll be hella expensive to replace. |