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Reload this Page Tach not matching engine speed

Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.

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Old 09-06-2017, 07:26 PM   #15
BirdTRD
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Quote:
Originally Posted by steve99 View Post
The auto trans control unit and the engine ecu will exchange a lot of data and then it makes yp its mind if its going to shift. Its possible that the tune and thte addition oc the changed diff ratio, may effect the way the trans control unit makes the decisions on when to shift.

The wheel speed sensors provide speed data and it knows engine rpm, but because of diff ratio change the speed vs rpm will now be different, this may upset the auto transmission control unit calculations
I just wish someone would crack the TCU already! I don't know what's involved in doing that but I would certainly assist in any way I could.
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