Precision 6776 H Cover most boost

[blackgn1]

I have searched but couldn't find a answer. Where does the 6776 H cover give up? I have the big exhaust housing. Seems like I read where the sweet spot was 26psi.

 

[bison]

76lbs/min@2.8:1 pressure ratio. Not many have seen that much out of it. John Crawford has seen at least that. So boost in the 27-28psi range at sea level 60*. To me a compressor is dead when the flow goes backward or stalls. Sometimes the cover causes mass flow stall when the compressor isn't out of breath. If you don't have decent heads and a decent intercooler and zero pressure drop at the inlet then don't expect to maximize this compressor on a 231ci engine. T04z map: