view this engine is it running seamless shift

[adam2007]

is this seamless shift gearbox or am i wrong beacuse when engine changes gear their is a pause in the spray i though the engine didnt stop or is that the sequentioal gearbox?

http://www.youtube.com/watch?v=y2iBbwocYZw

[Scotracer]

That's an old engine; it's a V10 for starters (not just from the sound but if you look carefully you can see 5 injectors on each side). Seamless shift came in around 2006.

[autogyro]

I would be surprized that the engine shown has any gearbox at all fitted to it.
It is mounted on an engine dyno up against a brake source.
The gear shifts you can hear are almost certainly simulated on the dyno based on track data.
As to seamless gearboxes. There is factualy no such thing. With either syncro assist devices or twin clutch three shaft gearboxes there is still a measurable gap or disengagement between gears during a gear shift.
The name is a promotional red herring.

[Cyco]

Auto,

The ZeroShift companies boxes are so close that they may as well be. They just need improved durability to have them in general use road cars

[autogyro]

Auto,

The ZeroShift companies boxes are so close that they may as well be. They just need improved durability to have them in general use road cars

Zero shift is a company manufacturing a novel syncro assembly.
It does not increase shift speed!!!!!!!! It just smoothes things out.
If you achieved a racing gearchange with dog ring engagement the shift would be just as fast if not faster!!!!!!!
The racing gearchange requires something sadly lacking in most modern drivers, 'skill'. It is a bit like changing gear with an old 'crash'
(no syncromesh box.) I doubt many on this forum even know what I am describing. The most skillful drivers were the old truck drivers.
Seamless shift is used to describe dual clutch dual layshaft gearboxes where one clutch engages a gear on one shaft as the other clutch disengages a gear on the other shaft. There is STILL a gap between the gearchange that can be beaten with a conventional layshaft dog box and a racing change.
The twin clutch so called 'seamless' gearbox comes with a huge downside. An extra layshaft complete with extra gears that sap torque from the power train.
All these ideas are simply attempts to make the gearchanges easier for electrical control systems and modern drivers, most of whom could not drive a proper historic race car. There is a way to change gear and transfer torque at the same time in a TRUE seamless gearbox but I will not go on.

[mach11]

can someone give me the actual pic of a F1 car's gearbox... ???/

[Imagineer]

Zeroshift is not manufacturing anything particularly not "novel syncro assemblies".

There are many buzz words to describe seamless shift gearboxes, like zero shift, quick shift or even trigger shift. It all boils down to changing gear without interrupting the engine torque to the wheels. I doubt any racing driver in any form of motor vehicle could achieve such a phenomenon.

[autogyro]

Zeroshift is not manufacturing anything particularly not "novel syncro assemblies".

There are many buzz words to describe seamless shift gearboxes, like zero shift, quick shift or even trigger shift. It all boils down to changing gear without interrupting the engine torque to the wheels. I doubt any racing driver in any form of motor vehicle could achieve such a phenomenon.

http://www.zeroshift.com/transmission-t ... ation.html

Watch it carefuly to see a"novel syncro assembly".
Then read their claims of a seamless shift with torque transfered during the shift.
Then work out for youself that there is still a time gap during the shift where torque is not transfered.
Then correct their claim.

[Imagineer]

I am watching carefully and I cannot see a syncro. Do you know what a syncro mesh gearbox is and how it works beause I do!

I am not disputing their claim as I have never experienced a Zeroshift.

I was merely pointing out the definition of a seamless shift
[quote="Imagineer"]It all boils down to changing gear without interrupting the engine torque to the wheels.quote]

Thanks

[010010011010]

uh oh

[autogyro]

I am watching carefully and I cannot see a syncro. Do you know what a syncro mesh gearbox is and how it works beause I do!

I am not disputing their claim as I have never experienced a Zeroshift.

I was merely pointing out the definition of a seamless shift

It all boils down to changing gear without interrupting the engine torque to the wheels.quote]

Thanks

With a stepped gearbox, it is impossible to transfer torque during the shift.(by current conventional means).
When you change up a gear you are in effect forcing the engine to reduce its output rpm. When this happens, even if it is for a micro second no torque can be transfered from the ic engine. A syncromesh is simply a type of clutch that uses friction to decelerate the engine during the shift, a dog clutch does it purely mechanicaly and relies on the low inertia of a racing engine with no flywheel weight to prevent breaking the dog rings. The ECU is used to actualy cut torque during the shift to make it easier, faster and to give less chance of breakage.

[autogyro]

A so called seamless gearbox uses two layshafts with two clutches.
One gear on one shaft is disengages and one gear on the other shaft is engaged.
This reduces the time between gears, however the two clutches work as friction syncronizers. When they are slipping to force the engine speed to match the output speed there can be no torque transfered. So although the shifts are very fast they are not seamless.

[Edis]

is this seamless shift gearbox or am i wrong beacuse when engine changes gear their is a pause in the spray i though the engine didnt stop or is that the sequentioal gearbox?

http://www.youtube.com/watch?v=y2iBbwocYZw

That's a F1 engine (mid nineties Renault V10) run on an engine dyno without a gearbox. It's probably an electric dynomometer as these are excellent for track simulation (which is what is done in this clip).

[adam2007]

is this seamless shift gearbox or am i wrong beacuse when engine changes gear their is a pause in the spray i though the engine didnt stop or is that the sequentioal gearbox?

http://www.youtube.com/watch?v=y2iBbwocYZw

That's a F1 engine (mid nineties Renault V10) run on an engine dyno without a gearbox. It's probably an electric dynomometer as these are excellent for track simulation (which is what is done in this clip).

doubt is was mid nineties v10 was used untill 2005 could be anytime

[Edis]

is this seamless shift gearbox or am i wrong beacuse when engine changes gear their is a pause in the spray i though the engine didnt stop or is that the sequentioal gearbox?

http://www.youtube.com/watch?v=y2iBbwocYZw

That's a F1 engine (mid nineties Renault V10) run on an engine dyno without a gearbox. It's probably an electric dynomometer as these are excellent for track simulation (which is what is done in this clip).

doubt is was mid nineties v10 was used untill 2005 could be anytime

I think the engine in the clip is a Renault RS7 which was used back in 1995.