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Old 08-01-2010, 08:42 AM   #1
renhoek
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Member#: 71339
Join Date: Sep 2004
Chapter/Region: International
Location: Victoria, Australia
Vehicle:
1995 WRX STi RA
1995 WRX STi LS1

Default Modifying tacho readout

As the title says, does anyone know how you can electronically make the tacho read lower than correct? ie Engine speed is 4000rpm but tacho reads 3000 rpm. I was thinking a resistor I would switch into the circuit or something like that.

Any one have any ideas?
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Old 08-01-2010, 09:16 AM   #2
Mulder
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Chapter/Region: Tri-State
Location: NYC
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15 WRX/05 GTO

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The tach uses a pulsed waveform generated by the ECU that varies with RPM. You'd have to build a circuit to intercept and modify that signal, not easy at all and far more involved than just a resistor.
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Old 08-02-2010, 07:05 AM   #3
renhoek
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Location: Victoria, Australia
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1995 WRX STi RA
1995 WRX STi LS1

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Oh well, at least now I know.......

Thanks very much for the response.
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