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Electronic gear shift in a CEC?
tegwin - 23/12/07 at 10:49 AM

Was lying in bed thismorning building my dream car in my head...(as you do!)...

And I was wondering.....assuming that on a transverse engine to change gear you simply have to pull the gear selector rod in and out of the box the correct amount to get each gear...

Would it theoretically be possible to use an electronic system perhaps using Pneumatics and microswitches to have an electronicly controled gear change using paddles on the dashboard?

I can easily design the electronics/mechanicals of the system, im just wondering if I might run into any problems etc?

snapper - 23/12/07 at 10:51 AM

search for Trickshifter.
See here, i'v done it for you.
Trickshifter, will keep looking as i have seen it someware
OOps this is clutchless manual shift system

Found it HERE

[Edited on 23/12/07 by snapper]

[Edited on 23/12/07 by snapper]

[Edited on 23/12/07 by snapper]

Aico - 23/12/07 at 10:57 AM

You still need to use the clutch.

tegwin - 23/12/07 at 10:58 AM

Yup, I know I will still need to use the clutch...

The electronic system was just a way of removing the need for a complex rod linkage type gear system....With the engine in the middle, making a decent rod gearchange system seems tricky..

snapper - 23/12/07 at 11:01 AM

Not with the second link and the trick shift electronics.
Have seen some fully electronic ones in some of the kit car mags recently.

Now if you linked that in to the shift light system with a rev attenuator for the first couple of gears you could make a drag race auto max revs gearshift system.
Just plant your foot and go.

[Edited on 23/12/07 by snapper]

snapper - 23/12/07 at 11:06 AM

Demont Tweeks if your pocket is deep enough
Omex

[Edited on 23/12/07 by snapper]

mark chandler - 23/12/07 at 11:21 AM

Bowden cables for the gear shift, save yourself a fortune.

Regards Mark

MikeRJ - 23/12/07 at 11:43 AM

quote:
Originally posted by mark chandler
Bowden cables for the gear shift, save yourself a fortune.

Regards Mark


With the bonus that you can actually feel the gear change. A hydraulic/pneumatic/electric system will just push the gear lever with no mechanical sympathy, which will end in tears if the box doesn't want to go into gear for whatever reason.

Mr Whippy - 23/12/07 at 12:28 PM

I've been spending quite a bit of time on this problem. I've been looking at miniature hydraulic cylinders to move the lever. A very simple diagram below -

you can see that any movement at the shifter will be replicated at the gearbox, including the 'feel' of changing gear. Due to the strength of the hydraulic systems very small cylinders could be used.



[Edited on 23/12/07 by Mr Whippy] Rescued attachment untitled.JPG
Rescued attachment untitled.JPG

MikeRJ - 23/12/07 at 02:54 PM

If using single acting rather than double acting, you'd have to be careful to size the cylinders to ensure you don't start creating vacuum pockets etc.

Mr Whippy - 23/12/07 at 03:58 PM

yeah don't take the diagram to literally, I knocked it together so I didn't have to type so much

Double acting of course and you'll note the pipes are on the wrong ends, but you get the general idea...