Nice bro!!! One sick Jeep you got there!!! Yeah something looks off on it and it could be belt slippage.... You see any signs of black rubber in the engine bay? What pulley you running now on the blower? Still the 3.2" or did you go to a 3.0? What does your AFR and look like in this run?
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If it held 10-11 psi, then I wouldn't think belt slip, unless you were expecting more boost.
If it is an 11lb pulley setup for your motor combo, then you're just making the boost you're supposed to. Get a graph with boost reference and see if it climbs and falls or if it climbs and holds steady.
With centri blowers you'll see more boost with rpm, but realistically your graph looks normal-ish. Your torque plateaus before your HP peaks, which implies that you were still making power with RPM gain. Should it make power past 5500 rpm? That depends on the rest of the setup, I have no idea what cam you're running.
If the boost fell off, that would explain it, but steady 10-11 psi doesn't mean that it fell off at 5500rpm. If you were making 11psi at 5500 and 10psi at 6000, that still doesn't explain the 50jp loss.
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Yes, about 12PSI on non-coated pulley and regular NAPA belt from what I could tell. But those were street runs and it was much warmer if that makes a difference.
I wonder if it's crank pulley slipping...
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