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Message: [QUOTE="Charles, post: 1310510, member: 103"] Compared to a smaller nozzle you will usually lose a bit of low power resolution, or quality. You lose ability to inject small amounts of fuel with high precision. It's like trying to control video volume in youtube when your master volume is set to max. You're right at the very edge of the volume slider on youtube to listen to a video at lowish volume. The result to the truck is that it becomes much harder to control haze and idle stability as the nozzle grows, taking injection rate with it. But.... As you start pushing your foot down on the pedal you quickly flip over to a request that is better served with the 200 and suddenly smoke and temperature start dropping with the larger nozzle because the fuel can be placed in the cylinder within a window that allows for more complete combustion. What that means to the truck is that you can make more power for a given smoke and egt. When towing you will be dragging hell out of the trailer before you reach your personal egt limit, if you ever do! When you're hauling ass, it means you're hauling MORE ass, smoking less and running cooler while doing both. But all of that depends on someone writing a program that doesn't drown the poor bastard in duration the engine does not WANT! If we had started with larger nozzles..... like if the 7.3 had been offered from the factory as say a 400hp version..... the computer would never have ASKED for so much duration in the first place. It's only because we tried to stretch power out of a small nozzle that we ended up with so much pw in the first place. If we just get the injection window back where it should have been and swap the nozzle instead of pushing hard on a small nozzle with too much programming, the truck is much, much happier..... except at very low power demands, like idle. As a for instance...... many people running A-codes have dual pumps and thousands and thousands of dollars of sh*t on their trucks and they make sub 500hp, that that's all they've got, the injectors are maxed. In contrast my red truck with a single 15 degree OBS pump from a wrecked truck engine would blow the tires off to 4500rpm for days with 400/400 injectors. Over 500hp on a single OBS pump because the 400 could pop that fuel in the hole right now with short duration and make the most of that fuel, with a hybrid that doesn't play the F around game like an A-code. There were always guys running single stock pumps and big hybrids making power, they just got ignored or written off. I'll tell you right now, if you tune a truck like you've got some sense you'd be AMAZED at what you DON'T need in order to zip down the road. And tiny ass nozzles is on the list of sh*t you DON'T need on anything but a dedicated grocery getter like my wife's excursion that I want to idle like silk all the time and give me no bs ever. [/QUOTE]