95 lt1 injector offset questions

[Fast355]

seriously i wouldn't worry about it on an LT1. it's just not a precise machine.

even injector voltage offsets, if you don't have them, are no big deal. unless your alternator shits the bed it only ever uses two cells of that table anyway. just rough in the injector constant and throw the offsets in if you have them.

it's like obsessing over tuning the far top right corner of your VE table, which unless you have a standard transmission and floor it from a standstill in 6th gear, you absolutely can't reach, and even if you did, fueling accuracy in that region doesn't matter.

in most of my tuning i never touched that and they were dead on accurate with no hiccups in drivability

focus on things that make a difference. kur4o's EOIT stuff probably makes way more of a difference than all this

Agreed! Some guys can stress out to the nth degree, but it does not really matter much. The better the data you have the better off you are; that being said it is not the end of the world. Tune it so that the air/fuel ratio is right and you are golden.

This was with Ford data out of a stock Ford PCM converted to GM which some people claim will make the GM run like poop.
https://youtube.com/shorts/TRVDXmOpSHA?feature=share

[steveo]

there definitely are temperamental machines that require incredible precision.... with high compression and tons of boost you can often be .1 lambda point or 1 degree of timing in between scalding power and death. you'd figure that you'd want to really nail your injectors down, but guess what, even on those machines people often aren't screwing with injector parameters that much. my 25psi boost buggy has a 32 bit ecm with only 5 cells for injector latency and that's it, and injector timing probably is all thrown through some proprietary equations that match with variable intake cam timing. when i put completely different injectors in there, i just left that table alone too.

[spfautsch]

The point you are missing is that the angle of the knee does not matter. It still going to deliver less than the theoretical delivery base off pulsewidth thus the numbers will still need to be a positive number. The injector that has more initial delivery will just have lower values in the adder table. The injector that has less flow initially will have larger numbers. Either way you still have to add to the total pulse width to get the full fuel charge.

Actually, after going through the exercise of sketching out the slopes yesterday, I'm no longer missing that point. You are correct. As I'm looking at the low pulse adder table for my '01 LS1, it's a typical adder table. Though I didn't originate it, I guess I'm guilty of spreading bad information.

[Fast355]

Actually, after going through the exercise of sketching out the slopes yesterday, I'm no longer missing that point. You are correct. As I'm looking at the low pulse adder table for my '01 LS1, it's a typical adder table. Though I didn't originate it, I guess I'm guilty of spreading bad information.

I know the feeling there. It threw me off a bit too having just been messing with and converting injector data. Then a light bulb clicked on when I saw those Injector Dynamics graphs.