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Message: [QUOTE="78f100, post: 336839, member: 3542"] Elite 60hp nozzles with stock hpfp (109k miles) airdog and elite airdog upgrade. Rp is 18k at wot on kem345 1.92pw. I am trying to figure out which way to go, Mike at kem says I may be leaving as much as 50hp on the table with the low rp. I have been trying to make sure I have everything adjusted right before I go replacing my hpfp. I was told by Elite, to max out the airdog reg and the elite reg but I get a hpfp surge, I can turn the airdog reg down to 13 to 14 psi with no surge. I have studied the fuel system and found that stock fuel pressure to the hpfp is 3psi from the manual... • The fuel pressure regulator is located inside the engine mounted fuel filter housing in the standpipe. • It regulates fuel pressure by routing unfiltered fuel from the filter housing to the HFCM via a spring loaded poppet style valve. • The cracking pressure (pressure at which the valve begins to open) of the valve is 2psi +\- 0.5psi. Actual fuel pressure may be above or below this specification. • The regulated pressure of the valve is 3psi+/- 0.5psi. Actual fuel pressure may be above or below this specification. NOTE: The fuel pressure regulator is NOT serviceable separate from the housing! If the regulator needs to be replaced, then the entire housing must be replaced. Why do I need the ad pressure up so high? The more I turn the pressure up the louder the airdog and the hpfp get, just seems like the ad is working too hard to keep higher pressure up. I am curious If I can run less pressure but maybe more volume to the hpfp by turning the airdog down more, also what should the pressure be at the elite regulator? I just want to make sure I dont go buy a new hpfp if I dont need one. [/QUOTE]