you are seeing it diferent than me then, the way i read it you WILL run lean. it will happen on each cylinder at a diferent time and doesn't seem to show up on the wideband since they all do it at diferent times, once you go full static then no more problem. i would rather be at 100% than 95%.

maybe they are full of crap? i really dont know, just what i have read.

 

See that's where I don't understand it then because on a wideband I know a ton of people that run at 100% or more duty cycle yet don't show up lean. Now I do know of more than a couple people that have killed motors because they were running dry kits and maxing out the injectors. They would do fine on the dyno but one day it would just pop.

Running just about anything mechanical or electrical in this world at 100% is usually not a good idea. Why take the chance with something so important?

I don't think they are really full of ****. If you do the math with the formulas supplied you will see that it works perfectly for our trucks and the F-bodies.

5.3L truck
285HP / 8 = 35.625HP/Cyl

35.625HP x .55psi / .80 = 24.49Lbs/hr Injector size.

5.7L F-body
305HP / 8 =38.125HP/Cyl

38.125 x .55psi / .80 = 26.2lbs/hr Injector size

Although the formula is a basic one. I used it to figure out injector size when I still had my 600rwhp Mustang.

 

This is the best example I had ready. Look at the bottom row, notice the O2 readings for each side. The line is level at about .90 until it hits 5500 rpms, then it starts steadily dropping because the injector can't supply more fuel. My widband shows it over 13:1 at my shifts, when my O2s are reading about .85ish or less. I can adjust my PE numbers but it doesn't matter, because the injector cannot physically supply more fuel.

 

I ran into the same thing as Big Tex. Over 5000 RPM My air fuel headed into the 13.5 range on that sloped line that tells you flat out you are out of injector and no matter how much you program fuel in, it is done. I pulled 383 at the wheels, but this weekend at the track the truck only trapped 96 MPH and the guy who was driving it for me (I was running my Impala SS) said you could feel it start to lay over as he was approaching the traps plus I think he let it go into overdrive. We didn't get a chance to run it again.
It also needs a converter as well. The stock converter was providing a 2.2 60' time
Later,
Bryan

 

Having worked testing on a similar injector machine with strobe visulization/pulse/frequency/etc. capabilities.... real world, in simplest terms it should be stated that it is very dependant on each injector and application. Some injectors will only pulse down to 2.0ms, have a limited frequency range, and can't handle low or high pressures without a degraded spray pattern or going static. Most reccomendations on the web, are merely generalizations meant to make you think twice about pushing that injector you know nothing about. There are some injectors I would not push anywhere over 75% and I wouldn't go outside of .5bar of it's original operating pressure because spray pattern and atomization suffer so horribly. Other injectors wouldn't succumb to any test we threw at it... pulse down to .7ms, handle any pressure from .5bar-7bar, and work from 50-10,000rpm.

I found that as soon as you went over 440cc/min who made the injector really started to make all the difference in the world. It's a wonder that people can get their cars to idle at times with some of the patterns I saw on the larger injectors. After all, if you go pick up some 550cc/min or larger RX-7 injectors for your piston engine, they don't pulse below 2ms (say your stock ECU says idle at 1.3ms), or handle the frequency that a lot of piston engines need in the high rpm. kaboom...

If you are going to push the envelopes, do it on an injector that you know will handle that. Otherwise, play it safe. I did not have the opportunity to check any LS1 related components that I was aware of, however we did see some larger injectors from some of the domestic performance companies and they ranged from ****-poor to reasonably good... might have had one 'superb' set of the bunch... not that I can recall which was which anymore.