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Old 04-04-2013, 04:59 PM   #135 (permalink)
hackish
Calibration Engineer
 
Join Date: Jan 2010
Location: Canada
Posts: 86

Subie - '00 Subaru Impreza STi JDM
90 day: 22.49 mpg (US)
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Quote:
Originally Posted by California98Civic View Post
Actually, the HX is the successor to the VX, with vtec-e and EGR but with the 1.6L engine and significantly shorter gearing (especially final drive, about 3.75, instead of 3.25). Even the wheels are the same design, though an inch larger.
Ah, cool, I didn't realize the HX was in fact a newer revision of the VX. An interesting question then is which ECU was used? I think the P2N was the HX which obviously will support the proper EGR and lean burn but we never bothered to develop any OBD2 tuning stuff.

The VX, which was a P07 had those features too. That's the ECU I used in my swap and it required the ever-expensive L2H2 wideband O2 sensor. I would normally swap ECUs in a '96+ car, with a conversion harness to go to OBD1. Adding extra wires for the 7 wire sensor was pretty simple.

The downside with my own swap is that the VX ECU is not chippable. So you either go down to a P06 series and lose the wideband, EGR and lean burn or you live with the factory tune. Like a barefoot shoemaker I never had the time to do any tuning stuff for the P07. Not like it would make any money as a product...

-Michael
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