Power shifting, Double clutching
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Power shifting, Double clutching
What exactly is a power-shift, and how do you do it properly? Does it do any harm to the tranny when done properly?
What is double clutching? I know that you use it in non-syncro shifting, but can't seem to get it right?
What is double clutching? I know that you use it in non-syncro shifting, but can't seem to get it right?
Laughing Gas
Joined: Jul 1999
Posts: 1,048
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From: Lacey, WA
Power shifting, Double clutching
Hi,
This is my interpertation of them. I guess it depends on who you ask. Anyway here goes. I believe Power shifting is what 1/4 mile racer's do with a M/T. You floor the gas and when RPM's get to redline you quickly push the clutch, change gears and release the clutch. All the while with the gas pedal floored. Must be hell on the drive train.
Double clutching on the other hand is more like normal shifting with an extra step. Example. Run out first gear and push in clutch, shift to neutral and release clutch, give it alittle gas, push clutch and shift to next gear. This would only be required for a non-sych transmission when you "miss" a gear. On an "18 wheeler" type truck, with some practice you shift without ever using the clutch except first staring out. Just run a gear out to the desired RPM and let off the gas at same time you pull the gear lever into neutral, as the RPM's fall you can pull the lever into the next gear. Never using the clutch. If you miss the "sweet spot" and miss the next gear(GRIIIND) you just give it some gas to bring the RPM's back up and try again.
Sorry so long. If this is wrong some else please correct.
Lee
This is my interpertation of them. I guess it depends on who you ask. Anyway here goes. I believe Power shifting is what 1/4 mile racer's do with a M/T. You floor the gas and when RPM's get to redline you quickly push the clutch, change gears and release the clutch. All the while with the gas pedal floored. Must be hell on the drive train.
Double clutching on the other hand is more like normal shifting with an extra step. Example. Run out first gear and push in clutch, shift to neutral and release clutch, give it alittle gas, push clutch and shift to next gear. This would only be required for a non-sych transmission when you "miss" a gear. On an "18 wheeler" type truck, with some practice you shift without ever using the clutch except first staring out. Just run a gear out to the desired RPM and let off the gas at same time you pull the gear lever into neutral, as the RPM's fall you can pull the lever into the next gear. Never using the clutch. If you miss the "sweet spot" and miss the next gear(GRIIIND) you just give it some gas to bring the RPM's back up and try again.
Sorry so long. If this is wrong some else please correct.
Lee
Post Fiend
Joined: Apr 2002
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From: Central Kali
Power shifting, Double clutching
Excellent reply Lee! I'm sitting here trying to remember If I ever did a power shift without lifting my foot off the gas pedal, at least a little. The clutch is going to feel a lot stiffer with the centrifical weights coming into play.
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Power shifting, Double clutching
Thanks for the reply!
I was told that double clutching is what I need to do to get my NP435 into 2nd or 1st when down shifting. It grinds real bad when down shifting to these gears unless you come almost to a complete stop.
I was told that double clutching is what I need to do to get my NP435 into 2nd or 1st when down shifting. It grinds real bad when down shifting to these gears unless you come almost to a complete stop.
Post Fiend
Joined: Jan 2000
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From: Metro Detroit (Redford)
Power shifting, Double clutching
My Mazda 5 speed is a bit reluctant to downshift into first gear and sometimes grinds. I don't double clutch as it has syncros, but maybe they are a little worn. What works for me is to depress the clutch, and as I pull it down to first I rev the engine and firmly, but gently hold the lever against first until it slides in.
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"Drive a stick young man! There'll be time for automatics when you're old and unable."
Post Fiend
Joined: Nov 2001
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From: Topsfield, MA
Power shifting, Double clutching
I thought power shifting was shifting w/o the clutch. Using the clutch to start off with, but matching RPM to tranny speeds so the shifter slides in and out of gear without the clutch. Double clutching i think is when u do that thing where u keep the gas floored and shift with the clutch. Cuz when u let out the clutch out with the engine at high rpm u get a jump.
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Primary rig is NOW TOTALLED :-X23 :
95' F-150 EB 300/6 5 spd with 4" Superlift, MSD, Ram Air, Gibson Exhaust, 32" BFG Muds
Some pictures in my gallery.
Then theres:
88' F-250 Superduty 351 + c6
95' Mercury Cougar 4.6L V-8
80' E-350 300/6 and a
3 spd column shifter. Top speed, 65mph, Go Baby Go!
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Laughing Gas
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From: Fayetteville, NC
Power shifting, Double clutching
[updated:LAST EDITED ON 03-Jun-02 AT 01:32 AM (EST)]First gear on the NP435 is not meant to be used on the street unless you're running large tires such as 36" or larger or pulling a heavy trailer. The only time I use the granny gear is pulling a heavy trailer or when I'm off road and want to crawl over a rock or a steep hill. When I'm on the street I use 2nd gear to take off with. If you do use first gear you can't down shift into 1st until the truck comes to a COMPLETE stop. If you don't, you'll wear out the gear box or do damage to it. Double clutching is what you had to do to a lot of the older heavy duty trucks. You take of in 1st, depress the clutch shift into neutral, release the clutch, depress the clutch again and shift into 2nd and so on and so forth. Makes for a very slow start.
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Post Fiend
Joined: Feb 2001
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From: Missouri
Power shifting, Double clutching
Power shifting is done by shifting without taking your foot off the accelerator. Semi trucks are shifted by letting the rpms fall down to the "sweet spot" to enter the next gear. Double clutching is done by doing like the guys above posted or if you drive a ricer and are in a bogus racing movie. There is an article on www.fordmuscle.com that describes all different types of shifting and what effect they had on the E.T. of their mustang. Look at the green machine article.
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Power shifting, Double clutching
Double clutching is as already posted, pushing the clutch and getting neutral, releasing, pushing again and selecting next gear. 'Straight cut' gears (ie. non syncromeshed gears) such as a semi-trailer's Roadranger (Eaton-Fuller) gearbox or some tractors can be changed without using the clutch. This is called 'straight shifting', and it takes some practice to do correctly. 500 RPM must be gained and then dropped to change up, and 500 RPM must be dropped then gained to change down. UNDER NO CIRCUMSTANCES SHOULD YOU STRAINGT SHIFT A SYNCROMESHED GEARBOX, no matter what the rpm is. Not using the clutch on a syncro box will dammage it, and if continued will destroy it.
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