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Message: [QUOTE="The Brad, post: 1434394, member: 14154"] Mike, you hit the nail on the head there. We all know you can spin a stocker past the choke line and make 30psi, but it makes a lot of heat. A pound of hot air has more volume than a pound of cold air. That makes comparing boost numbers pointless and is also why a 38r makes more HP per psi, it's not the boost, but the air density that matters. The SXE is another step in that direction, IT MOVES MORE AIR, and it does it with out creating more heat, so the air is denser. The whole 15psi at 1500 rpm just shows how well it spools and doesn't surge. My 38r surged below 2000rpm 'til I put the 11 blade in. I finally got to do some towing from CA to AZ and couldn't stop grinning. I pulled a toy hauler with a Rhino, 3 quads, motorcycle and all of our other crap, probably only grossing 16-17k, but it didn't matter what tune I was in, it ran cool. Back on the first page of this thread I posted a screen shot from a year ago pulling a hill at 23xx rpm, trying to hold speed while keeping egt at 1200. Boost was 17 IAT was 62* and MAT was 118*. I pulled the same hill tonight and tried to duplicate those conditions and take a pic. This time IAT was 53*, and MAT was 70*, and the EGTs were only 900. Once I fill up, I'll calculate mileage. [/QUOTE]

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