Looking for advise on pilot injection

[longcummins]

I am in the process of trying t build a tune that will work with my (CNG) system that I run on my truck. CNG = (Compressed Natural Gas) . I am trying to disable pilot injection above 1500 rpm so that I am not burning the energy available from the cng that is wasted in the pilot injection. I wanting the injection to take place only in or within the main pulse injection kind of like the older 12 valves with only a single injection event {above 1500 rpms). I have tried to set the pilot injection to 0.00 above 1500 rpms but when I do that I get multiple codes that come up and it runs pretty ruff. Any thought or input appreciated.

[2007 5.9]

Need to add main timing to offset the reduction in pilot timing..these engines need a minimum timing to run properly.

[longcummins]

I am still trying to get this figure out so what do you suggest + 10.0 + 15.0 % more over stock settings ? Any idea where I should start and what would be maximum to not go over?

[mpdtune]

Look at your stock pilot injection table. Basically you're trying to make it run like a 12 valve motor, just one injection event. They run static timing of around 12 degrees.

[longcummins]

So a minim of 12 degrees of timing then and that should make it stable then correct?

[2007 5.9]

12* of main is too much on a 07.5-current piston design at idle. Look in the 7-9* area

[longcummins]

Thanks you 2007 5.9 , I certainly cant afford to melt down a piston while trying to save money on fuel cost.

[2007 5.9]

And you don't want to run 7-9* static all the time...you still need to adjust timing as rpm rises...much like a regular tune.

[longcummins]

Yes sir that's what I was thinking, just down low in rpm where I am disabling pilot and low in mm3 correct?

[2007 5.9]

Yes, I run 7-9* at idle and just off idle I begin to ramp timing up.