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Interesting thread... I'm currently running the stock ECU with the Rtek v2.x mod, and was toying with the idea of leaning out the off-boost/cruise part of the map a little bit to improve highway cruise MPGs. Basically looking to play with only those cells in the RPM range of 2000 - 3200, at MAPs deep in vacuum below 10 inHg (i.e., steady cruise, light load conditions). Unfortunately, I don't have anything to monitor AFRs or EGTs, so I'm a bit hesitant to screw with this. Is there any real danger here, presuming I do this intelligently, i.e., small adjustment increments followed by road testing to assess results?
My "baseline" highway MPG average to date is pretty good as-is. I got just shy of 25MPG (24.9), measured on my way back from DGRR/Mitty last year. That was over a 10 hour trip, average speeds between 70~75MPH. As for lights & A/C, lights were on for maybe the 1st 2 hours (dawn/early AM), and A/C was on for maybe the last 7 hours of the trip; it started getting hot by mid-morning. At that time, car was set up with 720cc injectors in all 4 holes, Supra TT fuel pump, BNR stage 1 turbo, Bonez DP into the stock main cat and Borla catback exhaust. Otherwise basically stock (stock S5 boost control, working air pump, emissions, stock fan).
Since then, I got her registered as a historic (no more sniff test), so I yanked the main cat & air pump/emissions gear and replaced it with the RB 2.5" DP and pre-silencer combo that bolts up to the Borla catback. Another trip to Dave at Speed1 is in order for some dyno tuning, since new the setup is now able to consistently hit 8psi boost with the stock boost control solenoid doing its thing. I was previously limited to about 6psi, due to the aging main cat.
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