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Fuel consumption goes up by around 15-20% on a CA18DET. It also comes with a free power upgrade (around 10-15%), as it allows perfect ignition timing. It also allows to keep oem compression ratio, even at higher boost, which means a more responsive engine.
I went from 9L/100km (26.14mpg) to 11l/100km (21.38mpg) with a somewhat stage 1 setup (performance upgrades: freeflow filter,FMIC, 1bar boost on stock T25, own remap) on a CA18DET. I cant remember how much hp that was, but there was about 20-25HP gain.
Now i am doing 13-14L/100 (~17.5mpg) with a T28 running 1bar boost and remap (and all supporting mods including exhaust). It makes around 300hp at that pressure, but injectors are maxed so i guess i could achieve a bit better mileage and power with bigger injectors. My CA eats a lot of fuel though. Much more than it is supposed to.
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