Shift without clutch, Damage?

ONLY for ADVANCED technical discussion about the 240sx!
Silvia2b
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Car: 95 240sx se / 07 G35s cpe / 2009 G37s sedan (rear-ended R.I.P.) / 19 Q50 rs400AWD
Location: Portland,OR.

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Hey I 'm just curious if anyone know of any side effects of shifting from gear to gear at the natural engine speed for each gear without using the clutch, I don' mean grinding until it pops in. This of course still mean means starting with clutch for first, and only on street driving around town, not for performance or racing. The reason I 'm curious is that I had to have some minor surgery to my left foot and It is painful to push the clutch in. When not in my car I even have a hard time flying with left rudder control, have to have my co-pilot take over taxi duty and left rudder coordination as needed. Any info would be cool. My stitches should come out in 5 days and wound will be healed soon so this is not a long term alternative to staying home form work.


IvoryJ30t
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Joined: Sun Aug 17, 2003 1:36 pm
Car: 95 Maxima GLE, 95 Maxima GXE

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as long as you dont grind, there is nothing wrong with it.

when i drove tow trucks, thats how i would shift all day long.only using the clutch from a standing start. your left leg gets quite tired after driving 300 miles with a 7 speed transmission if you use the clutch all day.

another words, pro truck drivers do it all day.

Altiman94
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Car: 1989 Nissan 240SX

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^he's right, you can also downshift without the clutch. I don't use the clutch while driving around town except for getting into 1st.

Silvia2b
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Joined: Mon Oct 28, 2002 9:33 pm
Car: 95 240sx se / 07 G35s cpe / 2009 G37s sedan (rear-ended R.I.P.) / 19 Q50 rs400AWD
Location: Portland,OR.

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Good I'm glad, I've always done it on the highway between 4th and 5th gear on long drives. It doesn't grind, but feels more resistive than clutch shifting.

IvoryJ30t
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if you practice, and learn the rpm/speed relationship for each gear, you can toss them up and down all day without any damage.

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slakker
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hmmmm very interesting guys. this is the kinda stuff that makes me love this site. ibnnovative, creative, hurt, lazt whatever, but it is cool. i never knew you could do that. it would save clutch

gunclap
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Joined: Wed May 21, 2003 8:59 pm

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so it's just like double clutching, but without the clutch pedal? hmm i'm going to try it out.

IvoryJ30t
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Car: 95 Maxima GLE, 95 Maxima GXE

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not quite. what you have to do is learn where the rpms fall to after you shift from the last gear.

when your upshifting, put a little pressure on the shifter, and back off the gas. the car will come out of gear.

now, this parts a little tougher. as the rpms are dropping, as the revs are slightly higher than where they would be for the next gear, put pressure on the shifter for that gear. when your good at it, the shifter will fall right in to gear.

now, to downshift. what you have to do is blip the gas a little while your taking it out of gas. then you rev the motor to slightly higher than where it would be for the lower gear, and push the shifter in to gear.

when you get good at it, its very easy. different cars have different gear ratios and that affects the speed/rpm relationship, so it takes practice.

gunclap
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i can match the revs while downshifting without the clutch pedal. just pretend like your left foot is pressing the clutch when in reality it's really not (for those who are used to pressing on the clutch). i don't know about upshifting. i wont even bother with that.

what i was wondering is if anyone can rev match while braking without the clutch (without using the left leg, since it's broken in this scenario)? it seems that you can only downshift once then if you were to heel and toe.

I see only one possibility when this is used...

let's say you were in 3rd gear and you were coming up on a turn and you will need to shift to 2nd for that turn. you would have to brake hard before the turn then pop the gear in neutral then blip the gas while still holding on to the brakes, then shift to second, then accelerate away. if you were in 4th and had to heel and toe down to 2nd it would be freakin hard, since it would take a lot of time to put it into gear and then popping it back out to neutral. by that time your rpm's would be so low that you can't even determine where the rev match is. so what i was thinking was from 5th - 3rd gear you would "double clutch", then while you're still maintaining a good amount of speed and you need to brake for the turn, you would have to heel and toe to slow down for that turn. but then again you can always "double clutch" all the way to 2nd gear, but that wouldn't answer my question.

haha sorry guys...uhh...tell me what you think. -=) i don't think this even makes sense.

IvoryJ30t
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what i would do is as your approching the turn, blip slightly, out of gear, brake, blip, in gear.

i dont really no-clutch in a car unless im just cruising, having fun.

car clutches arent nearly as hard as truck clutches. when i would get out of the international, and drive a stick car up the bed i would have a hard time controlling it because car clutches are SOOO much lighter.

if im racing or speeding or whatnot, i just use the clutch. its faster.

gunclap
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IvoryJ30t wrote:if im racing or speeding or whatnot, i just use the clutch. its faster.


I agree

IvoryJ30t
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yeah. in a car its more of a "look what i can do" thing.

there are truck trannies that you cant even shift with the clutch.you have to be able to no-clutch. it wont go into gear if you dont. [except 1st]

for example, the new international 4400 with the DT466HD motor and 10 speed transmission.

the way that works is there are 5 forward gears and a two speed rear axle. there is a switch on the gear shift for the axle.

R 1 3 5 |_|_|_|| .| .| L 2 4

you run up the gears, and when you hit the top of 5th, you come out of gear, switch to high axle gear, and go back to first. first becomes 6, 2 becomes 7, 3 becomes 8, 4 becomes 9, and 5 becomes 10.

L is low gear. its lower than first. you use it if your starting from a stop with a very heavy load. its not used on the high axle gear.

just to give you an idea of how much of a pain in the *** it is, you would be in 6th gear at 35-40 mph

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NoezUP
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Pretty interesting guys. Never new that was possible

IvoryJ30t
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yes it is. if your stopped on a downward slope, you can grab first without the clutch too.

let off the brakes and let the car roll forward. put pressure on the shifter as if your trying to go into first. when the car rolls fast enough, it will fall into first.

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240SX=fun4me!
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yea, this is funny, i know my old man drives his feightliner(something like 13 speed) without using the clutch all the time. So i tried it the other day, and I had no prob due to previous experience with dirtbikes, fourwheelers.

Only thing I didnt do is downshifting. I'm a little weary to try it during downshifting only because i use my transmission rather than my brakes alot, and I'd just end uo giving the gear a haircut so to say :)

good to hear it's possible though :)


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