Haimsey
Premium Member
Registered: 8th May 05
Location: Nottingham Drives: Corsa B
User status: Offline
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downward gear changing in the following way -
double clutching (as to waht i believe it to be) -
clutch down > out of gear
clutch up
tap accelerator
clutch down > into lower gear
clutch up
AND
what ever this would be -
clutch down > out of gear
tap accelerator (clutch still depressed)
into lower gear > clutch up
just curious
help, opinions, disussion, comments, pics, other words so this can be in GC and not HZ 
Marcy Marc 
White Sport Progress Thread
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powey
Member
Registered: 6th Nov 05
Location: Gwent, South Wales
User status: Offline
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there would be a difference in the amount of time taken?
Depends on gearbox i suppose
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Cupra Steve
Banned
Registered: 7th Nov 06
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Only difference would be the latter would just rev and not go anywhere as it would still be in neutral.
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Toby
Premium Member
Registered: 29th Nov 05
User status: Offline
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quote: Originally posted by Cupra Steve
Only difference would be the latter would just rev and not go anywhere as it would still be in neutral.
so same as the first as they are both not in gear
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sam-smith
Member
Registered: 8th Jan 07
Location: plymouth, UK
User status: Offline
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haimsey
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CorsAsh
Member
Registered: 19th Apr 02
Location: Munich
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Double declutching is as follows:
Clutch in
Into neutral
Clutch out
Plip throttle to raise speed of layshaft to match roadspeed
Clutch in
Into lower gear
Clutch out
Combine that with heel and toe braking for rapid decelerative gearchanges that keep the car balanced into a corner.
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CorsAsh
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Registered: 19th Apr 02
Location: Munich
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Second one would just increase engine speed, and not affect the gearbox layshaft, so you're still relying on the syncros to take up the slack when you select new gear and let the clutch out.
[Edited on 16-03-2007 by CorsAsh]
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chrisj_88
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Registered: 22nd Sep 06
Location: Dewsbury
User status: Offline
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when i switch down a gear i dont bother tapping the accelerator before putting it into a lower gear. i just:
clutch in
out of gear and into lower gear
clutch up
floor it
is this bad? just means ure flung forward and then back in your chair
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FruitBooTeR
Member
Registered: 18th Jan 07
Location: Wolverhampton Drives: S15
User status: Offline
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quote: Originally posted by chrisj_88
when i switch down a gear i dont bother tapping the accelerator before putting it into a lower gear. i just:
clutch in
out of gear and into lower gear
clutch up
floor it
is this bad? just means ure flung forward and then back in your chair

Same era lmao

[Edited on 16-03-2007 by FruitBooTeR]
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Alex16v
Member
Registered: 30th Jun 06
Location: Chester Drives: Civic ep3 final edition
User status: Offline
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When i change up and down its usaually just:
1st gear
clutchdown
blip throttle / move to 2nd gear
clutchup
Ane the same back down the gears. seems to make it more smooth when changing down, and just keeps my revs up when changing up. Good for the 16 vvvalvers. 
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CorsAsh
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Registered: 19th Apr 02
Location: Munich
User status: Offline
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It's bad for a few reasons:
If you're driving quickly (on a track of course) you're shifting all the weight to the front wheels, which means when you turn in, the back end will be light and you'll be dealing with an oversteer situation.
You're putting more strain on your engine, gearbox, clutch and suspension as they all struggle to bring the roadspeed down to match the revs. Keep doing it and eventually your syncs will give up and go home.
You're gonna look like a wally and no one will want to get a lift from you.
Go on a driver training course, it'll help.
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CorsAsh
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Registered: 19th Apr 02
Location: Munich
User status: Offline
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quote: Originally posted by Alex16v
When i change up and down its usaually just:
1st gear
clutchdown
blip throttle / move to 2nd gear
clutchup
Ane the same back down the gears. seems to make it more smooth when changing down, and just keeps my revs up when changing up. Good for the 16 vvvalvers. 
You dont need to raise revs on an upchange... some people do it on drag strips - "powershifting" - but all you're doing is raising the revs for the clutch and box to bring them back down and accelerate normally through the rev range.
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Rachel H
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Registered: 12th Nov 03
Location: Berks
User status: Offline
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I have a question, about 6 years ago my mate was driving my Corsa SXi on the motorway and managed to shift from 4th to 5th without using the clutch, how is this possible?
Thanks
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Steve X16XE
Member
Registered: 31st Dec 06
Location: Barnsley, South Yorkshire
User status: Offline
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Are you asking about heal and toe down changes?
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Cupra Steve
Banned
Registered: 7th Nov 06
User status: Offline
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quote: Originally posted by Rachel H
I have a question, about 6 years ago my mate was driving my Corsa SXi on the motorway and managed to shift from 4th to 5th without using the clutch, how is this possible?
Thanks
my mate can do this in his mini?
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Alex16v
Member
Registered: 30th Jun 06
Location: Chester Drives: Civic ep3 final edition
User status: Offline
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quote: Originally posted by CorsAsh
quote: Originally posted by Alex16v
When i change up and down its usaually just:
1st gear
clutchdown
blip throttle / move to 2nd gear
clutchup
Ane the same back down the gears. seems to make it more smooth when changing down, and just keeps my revs up when changing up. Good for the 16 vvvalvers. 
You dont need to raise revs on an upchange... some people do it on drag strips - "powershifting" - but all you're doing is raising the revs for the clutch and box to bring them back down and accelerate normally through the rev range.
Thanks I was just guessing. Iwill drive normal again now lol. If i ever get a working car again.
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Cupra Steve
Banned
Registered: 7th Nov 06
User status: Offline
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quote: Originally posted by CorsaB4ever
quote: Originally posted by Cupra Steve
Only difference would be the latter would just rev and not go anywhere as it would still be in neutral.
so same as the first as they are both not in gear
no as the first one states Put into lower gear
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Steve X16XE
Member
Registered: 31st Dec 06
Location: Barnsley, South Yorkshire
User status: Offline
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whilst brakeing.
Clutch down change gear, and the same time roll your foot that is on the brake to the accelerator, cluth up and foot down.
Sounds fantastic. When people are watching you brake and rev up and change gear at the same time, they look puzzled.
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Steve X16XE
Member
Registered: 31st Dec 06
Location: Barnsley, South Yorkshire
User status: Offline
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quote: Originally posted by Cupra Steve
quote: Originally posted by Rachel H
I have a question, about 6 years ago my mate was driving my Corsa SXi on the motorway and managed to shift from 4th to 5th without using the clutch, how is this possible?
Thanks
my mate can do this in his mini?
All (as far as i know) manual gearbox's can do this.
When driving rev up to about 2k in 3rd. Lift off the accelerator apply preasure to the gearstick to go into 4th and it'll slip in. No grinding done.
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CorsAsh
Member
Registered: 19th Apr 02
Location: Munich
User status: Offline
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Well done, you just described heel and toe downchanging.
It's actually good for your components, bad for your fuel consumption.
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CorsAsh
Member
Registered: 19th Apr 02
Location: Munich
User status: Offline
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quote: Originally posted by Steve X16XE
quote: Originally posted by Cupra Steve
quote: Originally posted by Rachel H
I have a question, about 6 years ago my mate was driving my Corsa SXi on the motorway and managed to shift from 4th to 5th without using the clutch, how is this possible?
Thanks
my mate can do this in his mini?
All (as far as i know) manual gearbox's can do this.
When driving rev up to about 2k in 3rd. Lift off the accelerator apply preasure to the gearstick to go into 4th and it'll slip in. No grinding done.
It's called rev matching. The old lorries you hear on films that cruch had "crash gearboxes" - basically no syncromeshes, so the driver had to match the roadspeed to the engine speed to get a smooth change or you got the crashing noise.
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AuroraSport
Member
Registered: 5th Mar 05
Location: Norfolk Drives: Audi B5 S4 Avant
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aye shame i cant do it with my clown feet i just end up mashing the pedals
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Steve X16XE
Member
Registered: 31st Dec 06
Location: Barnsley, South Yorkshire
User status: Offline
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quote: Originally posted by CorsAsh
Well done, you just described heel and toe downchanging.
It's actually good for your components, bad for your fuel consumption.
You haven't seen me drive Fuel consumption is nowhere to be seen
:big head: I can say that I perfected the heel and toe in one week. Been doing it now for 2 months. Try it. When you get it right...... Everything is soooo smoooth.
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CorsAsh
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Registered: 19th Apr 02
Location: Munich
User status: Offline
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I do it without thinking now.
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Steve X16XE
Member
Registered: 31st Dec 06
Location: Barnsley, South Yorkshire
User status: Offline
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quote: Originally posted by AuroraSport
aye shame i cant do it with my clown feet i just end up mashing the pedals
What size are your feet?
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