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Message: [QUOTE="Charles, post: 259855, member: 103"] You should pick nozzle based on target power. If the vehicle target is 175 to 200rwhp, then a stock ~0.006" 7 holer is probably decent. If you want 300rwhp, then probably a 100%. 400rwhp, probably 200. You have to target your optimum power range with a nozzle, just like a cam on a gasser. With a larger nozzle you can make more power at the same rpm/egt at the cost of reduced low power efficiency. With a smaller nozzle you can have more efficiency at low power at the cost of higher power efficiency, and just plain old can't make but ____ power, because you can't get the fuel in the hole. As far as CP.... you decrease the pw and decrease the timing for a given power output. The engine will run cooler, cleaner and with less stress at 400rwhp with a 200 edm than with say a 30% EDM. All, day, long. Look at a stock nozzle compared to a 100%. A stock nozzle can support upward of 400rwhp, I've done it. But the duration required for it to get enough fuel in the hole is just dumb. Lots of smoke and timing requirements are higher. You have to start early, and spray late to get the fuel in the hole. A stock nozzle will usually make 300rwhp to 320 or so. Maybe 350 with a 38R lets say. And at what smoke level? And at what EGT sustained WOT? HOT. And smokey. My 550 has 100% nozzles with a 38R and makes ~300rwhp with no WOT smoke, and a sustained WOT egt of between 1100 and 1200 degrees, [i]forever[/i]. Fully loaded at full power it will not run over 1200 degrees. You will never do that with a stock nozzle at the same power. It can't get the fuel in the window that quick. For 400hp, he NEEDS to be running 200 EDM's. That nozzle laughs at 400hp, instead of straining to reach it. [/QUOTE]