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Message: [QUOTE="Charles, post: 220994, member: 103"] With the GT47 the first stage would run 2 to 5 lbs pretty much any time the truck was moving along. No perceivable difference in one charger vs the other. Even with the 94mm GT55 it still ran a few lbs of boost just cruising along at 50mph or so. It is a much bigger charger on both the hot and cold sides though, and did have a noticable delay between when the 38R would hit the stop set in the PCS and when the 55 would jump on up to 30 or so. Even still, I have little doubt that the majority of this was due to my having the wastegate control table holding the 38R gate closed for too long, not allowing sufficient drive to power the 55 until the 38R was all the way at max allowable boost before the gate would dump anything to the 55. As for calculations, what do you want to know? I can probably help. [/QUOTE]

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