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Message: [QUOTE="madman1234509, post: 1084619, member: 3910"] Ugh I know how you feel jd. We have done countless hours of testing with my truck with the gates, testing boost and back pressure numbers. Testing back pressure numbers in the intermediate pipe, which are always 1:1 on my gt4718. I feel a need a larger turbine wheel on it which leads me to buying an 88mm gt55. From the research I've done the most efficient way to have a compound set up run is to have the atmosphere do 1/3 the work of the high pressure. Doing the math and figuring out what boost is in your efficiency range is a big thing as well. But I can't seem to get my set up to do that. Right now I'm seeing 70 total boost with 40 of it coming if out of the atmosphere. I'd be happier with like 80-85 total and like 30 out of the atmosphere... All that matters is that you're happy with the truck and having fun with it. Smoking vets and sports cars is a huge plus. Time and testing will get you where you want. [/QUOTE]

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