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Message: [QUOTE="Big Bore, post: 97354, member: 760"] Secondary is a 38r that spools very well even here at high altitude. That is what I was starting to think also. And since the 47/38r according to Charles had gasser response off the line, and after lookinng more carefully at the maps as suggested earlier, I came to the 47 decision, not just haphazardly as suggested earlier. Yea that confused me and I didn't think it was right, but didn't know enough to argue the point. If my 38r already spools well, I dont think the 47 is going to lag things out since one of its functions is to feed the secondary higher atmosphere, which in turn is going to help it spool even faster, and the 38r is going to be feeding the drive side of the 47 pressurized exhaust and I dont see the size of the 47 drive side being a choke point at all. And Charles has stepped up to a 55/38r that is apparently even [I]more[/I] wicked than the 47/38r, telling me that the 47/38r is probably going to work very well at altitude. The gates seem to be more for the top end so I don't send the heads into orbit. [I]If[/I] the gates being closed do create a lag situation, HRT gave some good information on how to set them to pop open a bit when stabbing the throttle. [/QUOTE]

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