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Message: [QUOTE="Charles, post: 287813, member: 103"] Anything over 400rwhp and I would be running a 200EDM as my smallest possible nozzle choice. And I would have no issue whatsoever running a 200 on a truck making 175rwhp either, it would just be a waste of money to do so, and a loss in idle and low power efficiency for no real gain. If anyone wants to see how the people that get paid to select nozzles in these ranges do things, just start checking into nozzle sizes for diesel engines making 4 or 500rwhp. Think about that.... that's going to be a serious engine. Like a Cat C16. Now do the engineers designing an engine from the ground up, having to meet emissions standards, meet warranty needs, keep an engine together for half a million plus miles, so on and so forth, choose a nozzle equivalent to an 80%? Of course not. They run fire hoses into those cylinders so they can pop that chunk of fuel into that hole right now, real quick and real clean and make good, crisp power with lax timing and lax compression that will let an engine last. I haven't in some time, so I don't want to err with bad memory, but I would urge some of you to actually look up the flowable areas for some common commercially available engines in the power range you wish to learn about, and see what the engineers that get payed to sit in test cells all day pick for nozzle sizes for a given power. A quick start might be to note the nozzle used on the DT530 that only makes like 300hp, yet will pull well over 550rwhp on fuel. It can make over 550, yet for an engine that would NEVER see over 280 to 3xx, they chose it. They could make the hole count, size and angle whatever they wanted, and for a 300 some odd hp engine they chose the nozzle that comes on the BD injector that will support well over 500 on fuel in a 7.3. Now I don't want to steer anybody down the wrong path here, because the reality is that all it takes is one person that doesn't know what they're doing to make something like a 200EDM into the biggest nightmare you've ever seen. I know, because back in the day a freakin 175/173 injector was a smoky nightmare, lol. You have to tune them. For a 200EDM, in a working environment, maybe say 1.8ms MAX pulsewidth just for a starting point. Now with some people trying to run files with 3, 4 or 5ms right off the bottom of the pedal, yeah, it doesn't work. Can't work. And they go off with a completely F'ed conception of what the nozzle is, and how it acts. So, as it has been for literally years now, the 200 still gets mixed reviews largely on the basis of incorrect tuning. [/QUOTE]