When we used to write smoke files, we would command the motor to open the IPR in order to drop ICP. When the ICP is lower, the fuel will not atomize well causing a slower rate of burn thus more fuel burning while exiting rather than in the cylinder.
Larger nozzles will obviously dump more fuel at a quicker rate. There is only so much you can do with large nozzle injectors inside of the tuning.
With maintaining adequate ICP being as important of a variable in the ultimate goal for power as pulse width, having a higher oil volume to feed the oil system is huge. This is actually one thing that I am hoping to prove when running just the HPODS on my truck while keeping the factory HPOP.
I know a lot of 6.0 guys do not follow the 7.3 crowd much, but in the 7.3l world, if you upgrade your injectors, you upgrade your HPOP. It is just the nature of the beast in a HUEI injection system. For some reason 6.0 guys haven't had this same mentality until recently.
ICP and PW are absolutely relative to each other. One thing that is left out of your example is atomization of fuel. Optimized atomization of fuel will cause the 'cooler, cleaner running truck' you mention. Poor atomization will cause the 'hot smokey mess'
The higher ICP you can maintain, the higher the PW can go to maintain the same optimized atomization of fuel.
Atomoization is exactly what I was getting at... just talking about it without mentioning it.
Something interesting you bring up... what good is more oil if the IPR just dumps the excess?
I have been running a couple of different tunes and I have twin HPOPs and it seems that I can't get the tuning right.
I have been running a lot of tunes this week and have learned a lot. My tow tunes run the cleanest and still have great power. I was using my canned SCT tow tune and PHP econo FICM tune. At WOT I would see 1.3ms of pluse width and 4.0-4.4v of ICP and it runs strong and clean... still burns the tires if I am not careful
I have other tunes that runs 2.4ms of pulse width and hit 4.7-5.1v of ICP (way too much fuel for me)
I have another tune that runs 2.4ms of pluse width and only hits 3.6v of ICP and max IPR duty cycle of 60%... (ok amount of fuel but runs hot from what I believe is poor atomization)
I won't go into every tune but I have about 30 of them and each one has something different that I like and something that I hate. I am not a tuner so I don't know how it works but if I was to make my own tune I would want the lowest Pulse Width Possible with the highest ICP possible at all times.
My goal would be to have 4.7v of icp and 2.0ms of max pulse width for a good street tune... but according to a few of my tuners... it is not as easy as that. If would want the ICP to max out as quickly as possible and then start adjusting the Pulse Width Accordingly. My SCT canned tow tune seems to do that pretty good, but it maxes out at 1.3ms of pulse width
Jay... maybe you could get bill to comment on this.