i dyno'ed my stock 1jz with stock side mount and a t78-33d @~9.5/10psi with a 3 inch exhaust - made 336rwhp i will see if i cant find my dyno from 2 years ago.
i have a mines soarer ecu no fuel, boost, speed cut no rev limiter ( that i know of been to 8000rpm's a few times) and the timing map is more aggressive.
no need for a wide band just stop driving like a mad man and take its easy with the gas pedal.
nuff said thread close /
there is no way in hell your stock 370cc injectors are going to give you poor mpg its your driving.
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