Does anyone know if this is safe for the transmission? I was told that it's possible to upshift without the clutch, and it does work, i was just wondering if it will cause any damage to the car.

 

yes it will

 

Igot flamed for my response once... might as well come back for more:

http://forums.maxima.org/showthread....ghlight=clutch

 

yup. but I wouldn't recommend it unless you really know what u are doing.

 

RPMs prior to notching the tranny into the next gear....you might be able to do it a few times and get results but..the shift would necesarily be very slow as you played with the throttle to get that exact rpm 'matching' so...why bother?

 

I found that if you shift at about 2000-2300 RPM it goes in quite smoothly

 

I think it's called power shifting. You normally can do this at high rpm's so I'm not sure how it's done at 2-2.5k rpm.

I wouldn't do it. but that's just me.

 

clutchless shifting is not power shifting, and I wouldn't do either.

(power shifting is keeping the gas to the floor while shifting)

 

It's like what rally car drivers do...of course they can only keep a transmission untill the end of a stage before it gets destroyed. I wouldn't recommend it.

 

do..these cars have what's called an SMG -a semi-manual gearbox where hydraulics actuate the clutch as well as the gearshift mechanism when they toggle their paddles -much the same way the F1 cars execute shifts.

Their electronic engine control systems also 'blip' the throttle during the downshifts to attempt to better match the engine RPMs with the new gear..all hydraulically/electronically controlled and very, very quick...some F1 cars are executing shifts in 13 milliseconds -incredible when u think of the total mass that needs to be moved during this process...

 

yeah I know that, I thought that's what he was askin'. If not, why in the world would anyone not want to engage the clutch but still let off the gas?

 

it wont have any negative affect on the car is u know how to do it....

 

What we have here is a case of someone wondering if they could, when they should be wondering whether or not they should.

Let's pretend for a second that this will not hurt your car at all. I have to ask what they point is.

Silly

 

who ever told you that is a dumba$$... lol O my God the kind of stuff people tell u

 

cars dont work too well with that action (no clutch shifting).

You can however do this on a motorcycle (superbike) and it has no ill effect. In fact to get down the road like a banshee, the clutch pretty much goes idle.

 

Yes, damage is very likely, synchro wear, chipped teeth etc. The construction of racing and motorcycle transmissions make it reasonable - no synchros, straight cut gears, for example, or constant mesh design where the gears are engaged and disengaged from the shaft rather than each other. Roadgoing automotive trannies have synchromesh for easy downshifting and helical cut gears for silence, both inhibit (or make risky) clutchless shifting.

 

The ONLY time that clutchless shifting in a road car makes sense is if the clutch has died and you need to move the car. Been there, done that (2 or 3 times in 30 years), so I can vouch for the usefulness of having the necessary finesse.

On the other hand, maybe I should open a manual transmission repair business . . .

Norm

 

Thank you everyone for all the usefull information.

 

This thread intrigued me, so today in rushhour traffic I tried it. I have to say, that I am a believer. It does work! I wouldn't do it very often, but I can see, that if done at the right point, the gears go right in. 4th was especially easy. 5th and 6th didn't want to go in that well.

Anyway, in 18 miles, I only ground the gears once, and it wasn't that bad because I wasn't jamming the shifter in, since I was scared. Actually when your timing is just right, it slips right in almost on it's own. Now I realize, when I use the clutch, why sometimes it (gears/shifter) slips in so easily. I just happened to be all synced up.

My final thought about this is that I can shift way faster with the clutch in my everyday car, than without. I don't have to wait for the RPMS to come down (during upshifts) to a point before engaging. And I don't have to rev up to an RPM when downshifting. Anyway, that's that. I can say I've done, it and demo it, but it won't be a part of the everyday routine. Have a great day!