I've got some questions about running a car on the 454 injector.
Here's my setup:
*.030 over, 9.5ish:1 151 cubic inch, Pontiac Iron Duke 4 cylinder
*Comp Cams custom hydraulic roller cam ---> http://i892.photobucket.com/albums/a...d/cam_card.jpg
*Injector is BWD brand PN 57229Z (1990-93 454 truck, GM crossref should be 17091045, 17091046, 17112557, 17112567)
*Its mounted in a 2" Holley TBI unit that was intended for the Fiero (now discontinued)
*Intake is matching discontinued Holley piece made for the 4 cylinder
*EBL Flash with both injector drivers connected to the 1bbl TBI.
*BPC value is for a 151 CI engine with two 80lb injectors.
*12psi fuel pressure.

I have kind of an unsteady idle, and rich, 12.8:1 (fluctuates a lot) Injector PWs are around 1.4mS

How low can the injector PW go?

 

This afternoon I was idleing at 1.7msec and 13.5/1 on WB. Pretty good.
Lock OL idle.
A VAFPR will help reduce FP allowing a higher inj PW.
Are you idleing asynch? that may help BUT may surge as a result. I idle synch.
If you idle OL you can reduce the VE table cell value you idle in and those that surround it. Reduce 5% at a time

 

You definitely have a good idea on the VAFPR, I'm afraid it might ultimately become necessary. I'm trying to get away without the extra parts, cost, complexity, potential failure modes, etc, and I'm trying to keep it looking stock.

I need to be asynch since I only have the one injector.

It has some weird issues at idle where the WB doesn't seem to show good agreement with the narrowband, too. They seem to be in much better correlation at engine speeds higher than idle.

 

Actually it is the opposite. You want to avoid async as both drivers are on at the same time.

Need to also limit the injector duty cycle to 50%, otherwise again both drivers will be on at the same time.

RBob.

 

oh yeah, slip of the pinky finger.

Is there a way to force sync 100% of the time?

How short of an on-time can I get reliably and consistently from this injector?

Have you found the stock 454 injector delays found in many stock bins to be sufficient?

The BPC being what it is, it never seems to need to go above about 48% D.C. to fuel, but is there a way to force a warning if I do go over 50%?

 

I believe the Constants is where you look.

INJ-Asynch High I have set to zero
Low zero

Max RPM exit set high 6375
MAP to exit 100 kPA

High RPM to enter 6375
High MAP to enter 100

Monitor WP logs for DC > 50%

Prop gains idle mine are 3.0. Stock EBL(smaller injs) are 5.0.
Offset mine 14 stock EBL 20