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Originally Posted by Barry_Bordes
The 5000 psi sensor's error of 1% would be 50 psi. It is probably having a difficult time with resolution down there. The exhaust port opening is written into the engine spec for the program. I estimated it at 196º ATDC. The pressure still has work to do driving the turbine wheel, it probably would show a more distinct drop off if NA. We probably need another sensor on that side of the housing (hopefully in the future one each in the exhaust and intake ports).
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You could be right. I am not used to looking at pressure curves for gasoline-fueled turbo engines. The valve opening on a piston engine is visible in the trace, even with their slow valve loft. Valve open actually looks a lot like the shift in the curve at 175 ATDC.
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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