I've searched the boards and I've seen Glenn say a few times that increasing the injector constant will lean the engine and lowering it will richen the engine.

So does that mean that if you increase the injector constant on an engine with BLMs say, around 134, the BLMs will increase as the engine requests more fuel?

The reason I'm asking is that my BLM's are around 130-140 with a stock 350 chip and 24# Accel injectors, on a basically stock engine. Since the stock 350 chip should be set for 22# injectors, the same pulsewidth with 24# injectors would make it run rich (I assume). So shouldn't my BLMs be *lower* than 128? I'm trying to determine if I have a problem with the engine I need to address before I start burning chips.

 

Different brands of injectors have different operating characteristics.
That's why they use the battery voltage correction, it's to account for the low speeds opening characteristics of the injector.

There is a balancing act to play with the battery voltage correction and injecotr constants.

First get the injector constant right for light cruise, and you may have to juggle the injector some to get that right (assuming a stock configuration). Then trim the idle BL using the battery correction.

HOWEVER:

If you modified the engine enought to change it's VE (SD systems) then you have to move the VE corrections around some to account for the change.
If you working with a modified engine and a MAF system then you'll do best to really work at FP, Inj Constant, batterry voltage correction.

If you have a fuel pump voltage correction you MIGHT try working with that..

Often you see a dec change of 1 correct the BL, 1. But, it's not a rule.

Patinece and testing.
AND NOTES

 

Hey Grumpy, this battery voltage correction you are referring to, do you mean the table "Injector PW correction VS Battery voltage"? I think so, but had to ask. The more I look at this table, the more I like. Does this table actually ADD PW to the "calculated" value, which is based on MAF/load and others? Or is the "real" BPW that the ECM starts with?

Also, I have seen some hacs with 0's for volts <4.8 and >19.2. Does this buy you anything? My table has numbers all the way thru. I was hoping maybe the 0's would not allow the engine to run, IE 0 PW. IE if you had a very low bat, or malfunctioning charging system.

Okay then, under normal and healthy electrical systems, you should be at 14.4vDC. Under heavy loads with all lights and killer stereo on, you could be at 12.8v. So these 2 entries in the table are the main concern, yes? Does this affect just idle conditions, or the PW globally?

This is cool stuff!