SSTjumbo
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Clutchless Shifting, How Is It Done?

Thu Nov 14, 2002 2:25 pm

Short of putting an automatic or one of those other clutchless sticks in my truck, how is it possible to shift into another gear without pushing in and releasing the clutch? I've heard people say that you can usually put the trans in 2nd or 3rd gear at any RPM without any damage to it, but somehow I don't trust it. The only problem with my truck is, the tach seems to have been replaced with one of those ultimately pointless SHIFT! lights. Without a tach, is it possible to hit the switches at the right time, or am I giving myself a snowball's chance in hell?

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AWspicious
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RE: Clutchless Shifting, How Is It Done?

Thu Nov 14, 2002 3:30 pm

It has to do with coordination the shift with the RPMs and vehicle speed. Not easy to shift into, but, it's easier to shift out of gear.
I have a friend who is an automotive technician. He used to drive a (I think) 1984 Nissan (Datsun) Sentra (Sunny in some markets) and he's change gears without using the clutch. We'd all get a good laugh when he did that.
So, it is possible. You just have to practice.

AW.
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jcs17
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RE: Clutchless Shifting, How Is It Done?

Thu Nov 14, 2002 3:42 pm

If I were you, I'd just get a tach installed...they usually run about $300. My friend does clutchless shifting all the time in his Toyota Corrolla, he scares me when he does it. The bottom of the car feels like it will just fall. Its not smooth at all.
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AWspicious
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RE: Clutchless Shifting, How Is It Done?

Thu Nov 14, 2002 4:42 pm

Jcs17;
I don't know what your friend is doing wrong for the car to perform so unfavorably, because, when my friend shifted like that it did not upset the vehicle in any way. It has to be timed precisely, according to the car's speed, engine RPMs, and I think some gears go in easier than others.

aw
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T prop
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RE: Clutchless Shifting, How Is It Done?

Thu Nov 14, 2002 5:58 pm

First, why would you want to do it? It's hard on synchros and gear forks not to mention gear teeth when you miss a shift.

Here's what you are trying to do when you shift an ordinary gear box with out the clutch; 1. match engine rpm to road speed for whatever gear you want to be in. 2. coordinate this with the correct pressure on the shifter so as to complete the shift while the drivetrain is unloaded.

I would post instructions on how to, but I can see kids grenading thier parents gearboxes trying it.

Here's a few clues to doing it. 1. Rpm and drivetrain loading are controlled with you right foot. 2. Pressure on the shifter must be correct and constant during the shift. 3. Upsifting is easier than downshifting. 4. Practice with someone elses car before trying it with your own  Smile

T prop.


 
IMissPiedmont
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RE: Clutchless Shifting, How Is It Done?

Fri Nov 15, 2002 12:13 pm

I never use the clutch pedal to upshift. I only use it to downshift into 1st. I also have no tachometer. It is very simple really. When you are first learning DO NOT FORCE THE GEARSHIFT! Just snug the thing into position and wait, it will pop in. If your RPMs drop too low give the throttle a small blip and it will go into gear. If all fails try again. You can learn to do this in a very short time if you practice.

And T prop, you want to learn to do this because clutches are a pain in the butt to replace. I've got 387,085 miles on my old truck and I'm only on the second clutch. There is much more wear on a clutch when you release it and re-engage than there is when you shift without.
The day you stop learning is the day you should die.
 
BOEING747-700
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RE: Clutchless Shifting, How Is It Done?

Fri Nov 15, 2002 12:57 pm

I know when I drive a truck the only thing I use the Cluch for is starting and stoping. I take it out of gear then I increase the RPM to 1800 and then remove my foot from the fuel peddel and let the RPM drop to 1500 then I drop it in gear. When its time for a down shift the RPM will be at 1000 I take it out of gear then I increase the RPM to 1500 then drop it in to the lower gear. That is how it works with an Eaton Fuller transmission on a truck. With a car its much more simple as far as the speeds go. Most people who know how to drive a truck dont use the cluch anyway
 
TWAL1011
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RE: Clutchless Shifting, How Is It Done?

Fri Nov 15, 2002 1:20 pm

It's done with great skill and precision.
 
AWspicious
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RE: Clutchless Shifting, How Is It Done?

Fri Nov 15, 2002 2:39 pm

It's done with great skill and precision

There ya go!
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fritzi
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RE: Clutchless Shifting, How Is It Done?

Fri Nov 15, 2002 6:37 pm

I have one question:

How often do you guys change your gear boxes because this cant be good for the engine???
 
Klaus
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RE: Clutchless Shifting, How Is It Done?

Fri Nov 15, 2002 8:07 pm

When the clutch is used properly, it will last a long time. I´m still on my first one at over 250.000km, using it all the time.

Ruining the gear box for supposedly sparing the clutch is outright idiotic.
 
hartsfieldboy
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RE: Clutchless Shifting, How Is It Done?

Sat Nov 16, 2002 12:36 am

It's plain stupid to power shift, like Klaus said, why would you spare the clutch by sacrificing your gearbox? It's like the people who engine brake to save their brakes- they would rather wear out a several hundred $ clutch than wear out $20 brake shoes that are supposed to wear. It makes no sense.

One time, I HAD to power shift because the clutch pedal on my old BMW with over 200,000 miles somehow got disconnected from the rest of the assembly and it fell to the floor. I just made sure that the RPMs stayed constant while I shifting up. What REALLY sucked was trying to go from a stop, I stalled several times before I was able to go. I do remember blowing by a stopped school bus and a red light on my way to the mechanic so I wouldn't have to stop  Smile
 
Banco
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RE: Clutchless Shifting, How Is It Done?

Sat Nov 16, 2002 2:42 am

Appalling as it is for me to have to agree with Klaus  Big grin I cannot understand why you would want to do this. The manufacturers have put a clutch in for a reason; if you don't want to use it then buying an automatic is the only solution. I mean, they fit brakes as well, do you try to find a reason not to use them either?
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Klaus
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Banco

Sat Nov 16, 2002 4:10 am

Yeah, must be a cold day in hell...  Big grin
 
US AIRWAYS
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RE: Clutchless Shifting, How Is It Done?

Sat Nov 16, 2002 4:38 am

I clutchless shift all the time in my '90 Toyota Celica. I can do it between every gear but 1-2. I just go by the sound of the car. Did take a lot of practice though, and some instruction from friends.



Jonathan
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IMissPiedmont
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RE: Clutchless Shifting, How Is It Done?

Sat Nov 16, 2002 12:36 pm

And who said anything about speed shifting? That is an entirely different procedure. I have now 388,050 miles on my transmission and no problems.

BTW, the point about downshifting to save brakes is indeed semi valid. Just don't do it every day driving down my 12 mile mountain road. Ride the brakes all you want and pray that no one is in front of you when the brake fluid boils.
The day you stop learning is the day you should die.

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