Vortech8pSI

The stock B16's have 240cc injectors. I bought some 36 lb/hr injectors (370-380 cc). My question is, will the ecu compensate for the difference? Along with the injectors, ill be putting on a 10 psi pulley. Im currently runnig right between stoich and rich under boost. ANy tips would be appreciated.

mpg9999

no, it wont.

MORE IMPATIENT

hell na the computer wont compensate, i have 310's in my car and you need a fuel controller for them or your car is gonna run like ass and your gonna be extremely rich under every condition, i had to pull 15 percent out at low throttle up to about 6k rpm but on high throttle i only have about 4 percent take out under 5k rpm and i still run a little fat under non boost conditions........

MGBRaceman

I think the general thought is correct, you're going to run way rice unless you can find a way to reduce fuel pressure or controll the injectors so as they are relatively more closed during each cycle.

drifter

mgbraceman is absolutely correct...you will run rich

mpg9999

You can however use something like an apexi afc to compensate.

yeer

rich, rich, rich...........

Vortech8pSI

Ok, i had a v-afc until some ass goblin decided he wanted it more than me, along with some other shit.

Fabrik8

The ECU will run the same duty cycle with the new injectors, and it will unsuccesfully try to compensate when it runs too rich. Basically, the ECU will open and close the injectors for the same amount of time as the old, small ones, but now you have a lot more flow capability, and that's where the richness comes from.. The ECU needs to be tuned for a lower duty cycle (time on/off) at lower RPM and part throttle, etc... If done right, you can get really nice streetability from some HUGE injectors with the proper tuning and adjustment...