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05 STi PNP Setup with E85 Flex Fuel


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I have an 05 STi which will be getting a WRX10+ ECU
I'd like to add an ECA sensor, but it looks like all the DI inputs are taken up and like the Expansion cable for this model is not going to work properly
What are my options?

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Assuming you've got the WRX104+ ecu then I would use DI8 (pin D8).  This was originally the "start signal" so is not important - the only thing the ecu uses it for is the pre-crank prime.  You can change the pre-crank prime to work in Key-on position rather than start position so no real loss.

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