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Turbobikes.org > Technical > Mods > Doubling a tacho signal
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Author Topic: Doubling a tacho signal  (Read 614 times)
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horndog
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« on: December 09, 2008, 07:48:54 AM »
I am running an after market Tacho on my Busa turbo dragbike, problem is that when it is set to 4 cyl the tacho only reads half of true reading. Does anyone know if it is possible to double a tacho signal?
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jasonsbusa
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« Reply #1 on: December 09, 2008, 08:25:47 AM »
DOes it have 2 cylinder mode? I know some aftermarket shift lights and such are set to 2 cylinder mode
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DropBusa
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« Reply #2 on: December 09, 2008, 09:26:18 AM »
Quote from: jasonsbusa on December 09, 2008, 08:25:47 AM
DOes it have 2 cylinder mode? I know some aftermarket shift lights and such are set to 2 cylinder mode

+1
Schnitz's launch/shift lights run 2cyl mode.
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horndog
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« Reply #3 on: December 10, 2008, 07:42:49 AM »
No it only goes down to 4 cyl. Its an automotive tacho. Thinking about cracking the back open and seeing what function the switch serves, e.g. is it a resistor or what.
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DropBusa
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« Reply #4 on: December 10, 2008, 09:43:25 AM »
is it a plug and play?
are you tapping in from the tach signal from the ECU? If not that may be a route to go.

Whats the issue with the stock tach?
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horndog
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« Reply #5 on: December 13, 2008, 07:03:27 AM »
I replaced the stock dash with my own layout, A/F, Fuel Pressure, Water temp, boost and tacho. The bike will not do street work anymore, only 1/4 mile.

I tapped off the ECU signal so no good there. I tried to see if I could pick up something from the crank sensor but had no joy there either. I went back to the supplier of the tacho and they will refund my money and I will have to find a different tacho.
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