clutchless shift

[paulthewitt]

ok i guess this is the best section for it.

we all know that clutchless gear shifts can be done on a bike (tricky between 1st and 2nd though.) i saw a quote at the bottom of someones signature that quoted somone else saying:

[feef]

can be done going up OR down the gears, but down is Much harder,as you have to rev the engine to the correct higher revs while you're shifting the stick acros the box.

Clutchless shifting in an ordinary car does nothing for quicker acceleration, as the larger flywheel means engine speed drops slower than that of a motorcycle, so takes longer for the speeds of the input shaft and the box itself to match up.

with a lightened flywheel, it's a much slicker affair, but clutcheless shifting in a car is never going to be as quick as on a bike.

a
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[Chr!S]

Yup can be in a car. Much Harder to get right and smooth though.

[Kickstart]

Hi

Clutchless changes are certainly possible in a car. However you are going to get some hideous grinding noises when you get it wrong. Just as easy going up or down the box.

Friends clutch cable snapped in his Renault 19 in a dodgy area of Manchester so he landed up driving for about 15 miles doing clutchless changes to get somewhere less risky to get it fixed.

All the best

Keith
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[killa]

Bit stupid in a car TBH.

Tell you what is impressive, doubling the clutch (Mr McQueen in bullit), oh that Shelby noise.
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[Kickstart]

[Villers]

Had the exact same problem in my Cupra. The clutch cable snapped taking the pedal box with it. I was halfway up a dual carriageway hill and stuck in heavy traffic. I just had to wait for the right time, put it in second, floor it and turn the key - off it went with so much battery drain that the clock went back to 00:00. At this point I was aware of clutch-less shifting but not clutch-less starting off so I did it in second. Managed to get to a lay by and wait for much later on (15,000 people leaving the site where I work between 3.30pm and 6pm!!!) then limped it home, dropping into neutral and then revving whilst sliding the gear home. Wasnt that bad.

Cant really see the advantage in a floorin' it situation as you could easily miss a gear in the car and end up looking quite the fool!
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[DukeRed]

Doubling the clutch? Have wondered what it was since fast and furious.
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[Villers]

What? You trying to tell me you don't live life one quarter mile at a time?
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[killa]

[Kickstart]

[killa]

No doubt you get a rating.

Grrrrrr!!
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[garth]

yup, just to annoy you though Killa.



g a r t h
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[loply]

I do clutchless changes in my car all the time.

1) Push the gear lever into neutral

2) Allow the revs to fall to the correct speed of your desired gear (if going up gears) OR Raise the revs to the required amount if going up gears

3) Gently push the gear lever into the required gear and at the right RPM the lever should pop in perfectly

If you get a grinding noise the revs are too high or too low, in which case dip the clutch and put it in normally. You kinda have to get used to the exact revs to get the gear to slip in, else youll keep messing it up.

Between 4th and 5th on a motorway or whatever is really easy though, just make sure you dont let the revs fall too low.
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[loply]

Just to clarify double declutching (aka double clutching), the purpose of this is to make DOWN shifts smoother, not for shifting upwards.

If you tried to shift from 5th @ 70mph to third it would cause all kinds of problems (lurching, gearbox wear, engine braking).

If you double declutch you could go from 5th @ 70mph to 3rd without any problems what so ever, without loosing any speed at all, and totally smooth.

The purpose is twofold:

1) Prevent gearbox wear
2) When entering a corner at high speed it wont unsettle the suspension, whilst still maintaining high revs

Not much use on the road really, but good fun never the less.
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Yamaha SZR660 Caution to the wind, the throttle pinned!

[feef]

double-de-clutching was really only "needed" in the days before synchromesh, where you could easily TRY and mesh gears at the wrong speed.

Now it's only real benefit is making downshifts a little smoother

a
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[DukeRed]

I see now
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[ts50x0]

is double clutching then, like blipping the throttle when changing down on a bike???

[loply]

ts50x0, yeah basically the same thing, the only difference being that you put the gear into neutral and take your foot off the clutch during the blipping (whereas on a bike you just hold the clutch in).
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Yamaha SZR660 Caution to the wind, the throttle pinned!

[cqueen]

[killa]

[feef]

[killa]

Sorry man I kinda just briefed it, Its just to get the idea.
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[Kickstart]

Hi

Given how jerky a gear change is without blipping the throttle (in a car or on a bike) I am surprised that so many people do not seem to be doing it.

Must mean crash helmet finishes are improving. Otherwise they would all have marks in the paint on the back from being nutted by the pillion every time the rider changed down a gear.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Dam_buster]

yea i asked the question to binge, and he just laughed at me. i was just thought, hey it can be done on a bike why not a car?

lol..

thanks for proving him wrong guys!

JIM
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