Quote:
Originally Posted by TROLL
A WRX isnt the move to make if gas mileage is the priority... a Honda, Neon, etc. would be.
As for tuning a WRX to get better mileage, its not logically possible at least. The reason is that most cars have open loop and closed loop fueling, and then you are cruising around at light throttle you're in closed loop which automatically targets 14.7 AFR. Any changes you make to your fuel map will probably only be to the open loop portion, which is only for heavier throttle areas of the map only. Now if you have your injectors or your MAF scaled poorly then the car may be missing that 14.7 target and running worse than it should and could be improved upon, but you cant really improve much on a stock or near stock closed loop fueling map.
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Not exactly true Bryan. You can force the WRX/STI to be in open loop all the time. The only difference is its up to YOU to make sure that you have everything dialed in, in order to run correctly. These days I run completely in open loop, and only i have it set up to only run wastegate boost unless i push the throttle down more than half way. Many of the guys over on RomRaider run this way. Thats where I got the idea to target 15.1:1 afrs and not worry about ruining anything. I've pulled the plugs twice in the 9 months since I made these changes and they look perfect.
I also should have mentioned...that 20mpg i get... thats a 7mile commute that takes me 20 minutes each way... the car rarely gets on the highway.