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Message: [QUOTE="The Brad, post: 1516387, member: 14154"] The turbo moves air! The heads restrict the airflow! The result is boost! The higher the boost, the more air you can squeeze through the heads to provide enough oxygen to clean up the fuel. Wringing out a smaller turbo to hit 40 psi will yield less oxygen than a larger turbo at the same 40psi due to the heat created by operating the smaller turbo near the choke side of it’s compressor map. The flip side of that coin is drivability. The OP is asking whether or not he’s over fueling his 364.5 (The exh side, maybe), and if so, will a 366 meet his needs while maintaining low rpm performance. How a 364.5 performs on a 6.7, 6.0, 5.9, or anything else doesn’t mean it’ll do the same in a 7.3. A 6.7 will make more power at a given boost level than a 7.3 will, simply because of less restriction in the heads. TMCCOY, everything I’ve seen and read tells me there’s minimal difference in spool between the 364.4, 366 and 369. If anything, I think going to a 73mm turbine would make the difference. [/QUOTE]

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