40inches
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| posted on 13/10/10 at 09:30 AM |
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DIY Flatshifter: Possible?
Here is my plan, I have a Kliktronic changer fitted and the "control box" is basically a plastic box with two relays for up and down
change.
My idea is to fit a relay fed by the up change relay, connect the kill switch wire to this relay, then, when I press the up change button it will cut
the engine, until I release the button, simples Or is it?
Can anyone tell me why it wouldn't work? There has to be a reason Kliktronic want a few hundred quid for a Flatshifter interface box.????????
[Edited on 13-10-10 by 40inches]
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tony-devon
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| posted on 13/10/10 at 10:37 AM |
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I used to fit a microswitch that was actuated by the gear lever, soon as the gear lever moved it cut the power to the coils
me tight, nah never, just very careful with my money
heavy is good, heavy is reliable, and if it breaks, hit them with it
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MikeCapon
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| posted on 13/10/10 at 11:37 AM |
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It's certainly possible. In SuperSport 600 shifters were banned and the riders got round it by using the bike's kill switch wired to a
button on the left hand bar. Technique was to 'load' the shift pedal and then give a very quick stab at the kill button.
The only downside is that the kill period is not reliably controlled. The kill period can be a bit critical in that too long a kill will give a jerky
change and loose time. Worse is too short a kill where the power comes back on before the dogs have engaged. Result:- Missed gear accompanied by
horrible graunching as the dogs try and rip themselves to bits. Not recommended, particularly on Kawa ZX9s.
'Proper' shifters have an adjustable kill period of 35-50 microseconds. The cheapest way of doing this is with capacitor and a varible
resistor. Sorry but I do not have a diagram for one but this may help you know where to look.
HTH
Mike
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hobbsy
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| posted on 13/10/10 at 12:26 PM |
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^^ essentially what he said.
Get the timing or duration wrong and it can mean a lot of pain for your gearbox.
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40inches
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| posted on 14/10/10 at 12:52 PM |
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Thought it sounded too easy 
Another question. At what point is the delay set? I know that manual change Flatshifters have a strain gauge in the change rod to build preload, but
Kliktronic ones don't, they have an interface, does this interface delay the cut when the button is pressed, to build up preload?
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gingerprince
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| posted on 15/10/10 at 06:56 PM |
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I have the kliktronic changer with techtronics trickery box for flatshifting. Basically there's a yellow wire that comes from the kliktronic
box (upshift signal) that feeds into the techtronics box. I'd assume this is the same signal that the strain gauge jobbers generate in the
stick-shift flatshifters.
There's then a small screw adjustable resistor on the techtronics box that adjusts the cut time. I don't believe there's a delay,
since you want it to cut as soon as you ask it to shift. The issue is with it kicking back in.
When I first fitted mine, I often missed a gearshift because I treated the paddles like a playstation or F1 car, i.e. a tiny dab and let it do all the
work, when obviously you have to hold it for longer until the shift has completed. If you didn't have capacitor/resistor etc to let it back on
power after a few hundredths of a second, then you'd negate the advantage of having flatshifter as it'd be off the power longer than you
would be using the clutch.
Wouldn't know how to DIY it myself, but I'd suspect it's a combination of capacitor(s), variable resistor and a (number of) relays.
Remember you'll need one per spark unit.
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cloudy
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| posted on 15/10/10 at 07:01 PM |
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I made my own - required some PIC microprocessor coding, you really need to have a very accurate adjustable delay, it was about 30ms but you'd
notice 5ms either way to the quality of the shift!
James
www.warnercars.com
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