BigTex

iTrader: (16)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by bgreen:
<strong>...In old calibrations, there was a single line table of injector offset, just versus voltage, and the injector flow rate was a set value, not varying versus voltage or load or manifold pressure...</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">This is how the truck PCM is setup. For injector offset, the PCM does have columns for load, but they are the same value all the way down. Also, the injector flow rate is a fixed number across the entire table row. This is because the trucks have a different fuel regulator

I installed Bosch injectors on my truck. I was able to straighten up my ltrims by modifying the offset. I knew I had the correct flow rate since mid - upper rpm ltrims were close to 0. It was the lower rpms that had skewed ltrims. Modifying the offset made a difference at idle and low rpms.

I found some reference to LT1 cars having similar injector setups. Would the injector tuning techniques for LT1 edit have some relevance on our trucks?

bgreen

If the tables are laid out simiar, yes, and if you are using the same type of injectors, definitely.

Do any of the trucks use a deadhead fuel system? (aka no return, with set fuel pressure of ~58psi)

Brian Green

BigTex

iTrader: (16)

Not exactly sure what you mean about a deadhead fuel system. As far as I know, all 4.8, 5.3, and 6.0 trucks (not sure about the 8.1s since they are not LS1 based) have returns out of the fuel regulator.

I installed a bosch type wire harness, modified my fuel rail, and put in injectors from a 99 camaro (26.4 #s). I will spend some time looking over LT1 edit injector info and see what I find.