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Originally Posted by atobe
and your tach will be off by about 500rpm
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Quote:
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Originally Posted by white3ch0c0late
^Yup. The tach is calibrated for a v6, which is more free-revving than an i4. You'd have to get it recalibrated.
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Both the right answer, but the wrong reason.
A 6 cylinder motor has 3 ignition pulsed per engine revolution, a 4-cylinder has 2 pulses. The tach is setup for the signals of the correct motor. A 4-cylinder tach will read 50% high in a V6, and a V6 tach will read 33% low in a 4-cylinder car.
There is a chance you can swap the innards (you can on a gen2) if they are ok to a new housing so that you can keep your odometer 'n stuff...
Good luck.
-Charlie