Compression Ignition Addict
Join Date: Nov 2008
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Just found this on a different site. (My ebp is 15kpa higher then map at idle hope that's ok).
You'll need an accurate pressure gauge for boost and exhaust back pressure. The dash daq provides these readings as such; manifold gauge pressure is the same as actual boost pressure. EBP (exhaust back pressure) is atmospheric pressure + exhaust back pressure. MAP (manifold absolute pressure) is boost pressure + atmospheric pressure. It is easiest to use MAP and EBP as readings, but if you like math, you can use MGP and EBP - atmospheric pressure. The ideal street ratio is approximately 10 psi actual peak exhaust pressure higher than actual boost pressure. For example, If your EBP reads 75 and your MAP reads 65, you're perfect. Assuming an atmospheric pressure of 13 psi, you'd also be perfect having EBP of 75, and MGP of 52. To know your actual atmospheric pressure, look at EBP or MAP with key on, engine off.
01/07 Job 1 F350 H&S Tuned. ARP Studs, AFE 4'' straight pipe, EGR delete with elbow, AFE stage 2 CAI, 6'' lift on 37s, 20x12 Fuel Nuts two piece, Sinister coolant filter, CCV Mod, Projector headlights HID kit