I wanted to know where I was operating my 2.4L & GT3076R with regard to the compressor map. I grabbed the map off of Garrett's site and referencing the math available at http://www.turbobygarrett.com/turbobygarrett/tech_center/turbo_tech103.html - I began plugging in constants.

If you check the math below, I used an AFR of 12, a BSFC of .55, and intake manifold temperatures of 130. Target BHP is 400. I am actually running 19 psi, I used 14 psi as that was the figure I arrived at through calculations for target 400 bhp.

If you are bored or curious, locate your compressor map and plot your positioning.

***I just did the math and plotted my actual placement on the map, at 19 psi. As you can see at 8000 RPM (Doubt that I would ever touch this area in the 2.4L) I am past the compressor's choke point.

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2012 2500HD LML