bmadd

Thanks for the responses, those were along the lines I was thinking. It seems as though everyone gets different results, sometims using very similar setups. I am just trying to understand, as opposed to just doing it because someone else did.

Hey, I have been lurking this forum for awhile, and usually find what I'm looking for, but now I have a question. A short introduction: My name is Brendan, I am from Clarksville TN, USA. I am an Army helo pilot, serving next to some of your brothers in Afghanistan. I have three kids and a lovely wife, and cars are my passion. enough with that. I posted this in NICO, so I'm just copying and pasting. I have researced this quite a bit, but I still haven't quite figured it out. I have read about how to read compressor maps, done the math using ballpark figures(ie who really knows the volumetric efficiency of their RB?), and have come to the conclusion that my goals lay somewhere between the GT3071R, and the GT3076R. But where I am stumped is all the other options that go along with the selection. I'll explain further.I try not to chase arbitrary horsepower numbers, but it still catches my eye. I know that the "supported HP number" that goes along with the turbo is just a flow number. that turbo can flow that much air to support the said HP number, given supporting mods. I also know that doesn't mean if I buy that turbo, I will instantly have said HP. The maps I have been able to find use only one size turbine housing. So, in what configuration does a turbo flow it's max HP number? Does turbine selection even correlate to the flow capacity? I have seen what numbers others are putting down with the combinations they are using, but me being the meticulous type A personality I am, I need more justification than what some one else did. I really want to understand why. I have read people's comments that a .63 A/R turbine is too small for an RB25det. Then I have read that the .82 is too big. is a .82 good for a 3071 but not for a 3076? At what point does it become restrictive or create excessive lag? Does a 3071 with a .63 support as much HP as with a .82? I know it should spool faster, but do you trade top end for spool? I have been around these forums for awhile, and try to do as much research as I can before posting a question, so if this is a stupid post, point me in the right direction! My car is an RB25DET, ported head, valve job, stock bottom end (checked bearing clearances, solid comp & leakdown), fresh gaskets and seals, FMIC, 3in turbo back, with plans for AEM ems, and injectors and cams to support new turbo. it will see track duty, and some drifting, so functional power is the goal. Sorry for the long winded post, but a brotha's got nothin but time in Afghanistan. Thanks in advance!