Speed Shifting a 6 speed
Thread Starter
Instructor
Joined: Jul 2007
Posts: 236
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From: Mobile Alabama
Speed Shifting a 6 speed
I used to speed shift my 4 speed years ago by not letting up on gas pedal and pushing clutch as fast as possible while shifting gears - is this the same method for my 95 Vette. I worry about the hyd's in the clutch. My old car had mech clutch pedal no hyd so I didn't worry of course I was quite a bit younger then too.
Thanks
Thanks
Safety Car
Joined: May 2002
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From: Toronto ontario
Melting Slicks
Joined: Jun 1999
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From: Bowling Green KY
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Melting Slicks
Joined: Jun 1999
Posts: 2,949
Likes: 23
From: Bowling Green KY
After re-reading your original post I think we are responding to the wrong question.
I thought you were asking about not clutching AT ALL - it sounds like your question is not that but simply whether you should hold the GAS down the whole time?
I think a lot of guys do that, but I'm not brave enough.
I thought you were asking about not clutching AT ALL - it sounds like your question is not that but simply whether you should hold the GAS down the whole time?
I think a lot of guys do that, but I'm not brave enough.
Melting Slicks
Joined: Jun 2000
Posts: 3,215
Likes: 6
From: Tampa Florida
I think he simply is asking if the hydraulic clutch has quick enough action to allow 'speed shifting' or power shifting.
I see no reason why it isn't capable. There is a restrictor in the hydraulic line to cushion the engagement-this has been known to cause a clutch to slip as you run thru the gears-in the higher gears. But it is a problem whether you granny shift or not.
One can cut ~.3 off the quarter mile time by using such technique...whether it is worth it...your decision. I think most dislike because they lack the finesse to do it properly and accurately-me...due to that and fear the cost of my mistakes!
I see no reason why it isn't capable. There is a restrictor in the hydraulic line to cushion the engagement-this has been known to cause a clutch to slip as you run thru the gears-in the higher gears. But it is a problem whether you granny shift or not.
One can cut ~.3 off the quarter mile time by using such technique...whether it is worth it...your decision. I think most dislike because they lack the finesse to do it properly and accurately-me...due to that and fear the cost of my mistakes!
Last edited by No Go; Dec 6, 2007 at 07:13 PM.
Thread Starter
Instructor
Joined: Jul 2007
Posts: 236
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From: Mobile Alabama
Yes I was talking about when shifting from 1st to 2nd and 2nd to 3rd and so on - keeping the gas pedal to floor and popping in clutch as quickly as possible while shifting gears as opposed to "granny shifting" which I believe is letting off gas when shifting - that's what I currently do because I don't want to break clutch hyd's or shifter or transmission but with the old Muncie I could make it sound and react as a Automatic only better IMHO but age, maybe wisdom, maybe fear has me granny shifting - just wondering what others were doing - I've never shifted without the clutch but I hear it can be done - just never by me ...yet - maybe in another life.
Thanks
Thanks
Melting Slicks
Joined: May 2001
Posts: 3,014
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From: Raleigh, NC
Drifting
Joined: May 2005
Posts: 1,370
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From: Raleigh NC
It can definitely be done if you get the speed and rhythm right. Here's an in car video from one of my 1/4 mile passes. I lift the throttle about an inch off the floor on each shift to lessen the clutch slipping. With a better clutch, I'd just leave it on the mat.
http://videos.streetfire.net/video/8...dc01469d44.htm
What works for me is to start pulling/pushing the shifter to the next gear before pressing the clutch. As soon the clutch releases the load on the transmission it's in the next gear. I killed a transmission on a Z24 when I was a teenager learning that technique though.
http://videos.streetfire.net/video/8...dc01469d44.htm
What works for me is to start pulling/pushing the shifter to the next gear before pressing the clutch. As soon the clutch releases the load on the transmission it's in the next gear. I killed a transmission on a Z24 when I was a teenager learning that technique though.
Team Owner
Joined: May 2002
Posts: 24,337
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From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
I've practiced and done it successfully at part throttle on the street, but my one attempt at full throttle failed miserably. Haven't gotten the courage to try since.
But $1400 ain't bad.
But $1400 ain't bad.
Melting Slicks
Joined: Jun 1999
Posts: 2,949
Likes: 23
From: Bowling Green KY
My main fear is that as soon as you hit the clutch, even if you do it lightning fast, there is a sudden drastic loss in load on the motor, and therefore a sudden drastic increase in RPM, if ever so quick.
That can't be good.
Even with the rev limiters we have I ain't brave enough.
That can't be good.
Even with the rev limiters we have I ain't brave enough.
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
My main fear is that as soon as you hit the clutch, even if you do it lightning fast, there is a sudden drastic loss in load on the motor, and therefore a sudden drastic increase in RPM, if ever so quick.
That can't be good.
Even with the rev limiters we have I ain't brave enough.
That can't be good.
Even with the rev limiters we have I ain't brave enough.
http://home.san.rr.com/khastings/ima...so145audio.wma
Can you really pick up much time over that?
Team Owner
Joined: Feb 2006
Posts: 24,460
Likes: 7
From: sw Ohio
That was exactly the problem I had at WOT, and I always thought I could clutch pretty quick. Here's some full clutch shifts with zero throttle, listen for the 2-3 and 3-4 shift:
http://home.san.rr.com/khastings/ima...so145audio.wma
Can you really pick up much time over that?
http://home.san.rr.com/khastings/ima...so145audio.wma
Can you really pick up much time over that?
how do you shift that quick???
Melting Slicks
Joined: Jun 2000
Posts: 3,215
Likes: 6
From: Tampa Florida
Powershifting is a known ET reducer.
Makes sense to me...the engine does continue to accelerate (flywheel too) and when you reengage the clutch...that stored up energy in the flywheel is released into forward movement. I believe there are other gains, but any serious drag racing magazine touts the procedure-nothing new.
I used to practice on a pocket rocket in Japan...Toyota FXGT it would lay down good 10 foot of rubber on each shift (1 to 2)...although the clutch was going soft after 3 years of abuse...sure was fun to execute left handed (mainly because of the scratch)!
Makes sense to me...the engine does continue to accelerate (flywheel too) and when you reengage the clutch...that stored up energy in the flywheel is released into forward movement. I believe there are other gains, but any serious drag racing magazine touts the procedure-nothing new.
I used to practice on a pocket rocket in Japan...Toyota FXGT it would lay down good 10 foot of rubber on each shift (1 to 2)...although the clutch was going soft after 3 years of abuse...sure was fun to execute left handed (mainly because of the scratch)!
Safety Car
Joined: May 2006
Posts: 4,290
Likes: 140
From: Salem NH
Powershifting is a known ET reducer.
Makes sense to me...the engine does continue to accelerate (flywheel too) and when you reengage the clutch...that stored up energy in the flywheel is released into forward movement. I believe there are other gains, but any serious drag racing magazine touts the procedure-nothing new.
Makes sense to me...the engine does continue to accelerate (flywheel too) and when you reengage the clutch...that stored up energy in the flywheel is released into forward movement. I believe there are other gains, but any serious drag racing magazine touts the procedure-nothing new.
It's one of those things, if you can do it, you'll get an ET reduction. Tires should chirp with every shift down the track. I've missed a few times over the years, but thats what the rev limiter is for, right?
Hell, I sometimes have to shift my aveo this way in traffic to avoid getting cut off by some jackass in an minivan.
-- Joe