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Old 10-21-2002, 12:17 AM   #1
Scooby Guru
Member#: 7492
Join Date: Jun 2001
Chapter/Region: South East
Location: Hotlanta, GA
No race cars

Default Does the utec/unichip take over timing control or modify the signal to the ECU?

In the STX SCCA class we are allowed to run "Electronic components may be installed inline between an engine's sensors and ECU. These components may alter the signal coming from the sensor in order to affect the ECU's operation of the engine management system. Example: fuel controllers that modify the signal coming from an airflow sensor"

I know that the UTEC controls the air/fuel by modifying the MAF sensor signal that goes to the ECU, but how does it control the timing? Does it take complete control over the ECU or does it modify some sort of signal that goes to the ECU to allow it to raise/lower timing?

Also, does anyone know how the Unichip deals with the issue of controlling timing?

Thanks for any help
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Old 10-21-2002, 01:18 AM   #2
Scooby Specialist
Member#: 5994
Join Date: Apr 2001
Location: Fort Collins, CO
2004 Impreza WRX STi
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As far as I know the unichip intercepts and alters the signal to the ECU to do timing. IE: adds or subtracts to what the ECU wants to do through manipulation of the input to the ECU. The unichip is more of a delta (+/-) to whatever the stock ECU is doing by altering an input to the ECU.

Where as the UTEC completely takes over wherever you want it too and provides a fixed (but retards with knock detection) timing value that you specify.

Someone correct if I am wrong though.... it wouldn't be the first time .
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