I'm having trouble with my 454 injectors hitting their low limit in low MAP/low RPM (low VE) conditions and failing to inject fuel and causing either the stall saver to kick in or the engine to die. The pulse width is ~.8 ms when this happens. I'm continually bumping up the correction offset across the board to see if I can minimize this (as you guys suggested) and I'm wondering how far I can go with the offset. Its currently at 640 nanoseconds at 9.6-25 volts and goes up to 900 down around 4.8 volts. Also is there anything else I can do to get these things to perform properly on moderate-speed throttle lifts? It idles fine, right at about 14.2 on the WB.

 

I ran my 80# injectors at 730msec

 

I run open loop at idle with AFR's 13.2-13.5 with 90pph inj's at 15 psi.
Injector offset is 705, my sync pw at idle is 1.2.
I have async fuel disabled, also.
My idle is pretty darn close to perfect with these settings.

-timing is 20.5 at idle, 650 rpm.

 

If you are running stock heads and cam , then the best recommendation would be to ditch the 454 injectors and use 350 (61#) injectors. You just do not need the larger injectors.


On the other side, if you insist on keeping the 454 injectors, I think you are going about it wrong. They will fire at less than 800usec, however they may not be quite as linear. Therefore, I believe you will find at 800 usec you are going into async mode. This will often cause idle quality issues. I would lower the point where you go async to about 500usec and use an injector bias in the range of 300-500 usec.