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Old 12-14-2003, 10:22 PM   #1
Matt Monson
Scooby Guru
Member#: 832
Join Date: Jan 2000
Chapter/Region: RMIC
Location: Teh Ghetto Garage, CO
99 2.5RS, '85 911
'73 914 and 2012 BRZ

Default Converting an OBD-I Legacy turbo to OBD-II

Here's the deal. I recently acquired some STi v6 parts (manifold, injectors, fuels rails, coil pack, VF-28, and a complete engine harness.) I was planning on running an aftermarket standalone ECU to run this beast. But with the engine harness I am starting to think it would be just as much wiring and possibly cheaper to just convert it with the new engine harness and run the thing off an WRX ECU. I would take the car to Cobb and tune with AccessPort since it will be a one of a kind.

Any thoughts? Or anyone know of folks who have converted older OBD-I GC WRX's to OBD-II for engine swaps that I could use as a resource?
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Old 12-17-2003, 01:23 PM   #2
Scooby Specialist
Member#: 26155
Join Date: Oct 2002
Chapter/Region: E. Canada
Location: Levis,qc,ca
2008 WRX 5dr
Dark Grey


Hi. Going from OBD1 to OBD2 is easy. it's just a wiring question to be able to read code. but, going with OBD2 and wishing to have no CEL is another story. My MY01 RS powertrain swap into my 1993 base impreza is working pretty well. I get good gas mileage, engine run fine, etc. but i will always have CEL because i don't want to put all the recuperation thing on my car. canister, fuel tank pressure sensor, etc. I use the 01 fuel pump unit, and i will soon rework it to be hybrid because the fuel level guauge won't work with early float sensor. You'll need an electronic speedometer or some sort of signal converter if you want to keep your old speedo. using an old tranny (i consider old tranny being those with wire-driven speedometer) would be really tricky because with no speed sensor signal, it will stay il failsafe mode, cutting at 4K rpm.
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