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Originally Posted by Speedster
The surge valve is only for pressure imbalance on throttle bore shutoff. It is always closed under normal running conditions.
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True with a turbo but not so on a centrifugal supercharger... the surge valve is nearly always open until you get into the throttle enough so it closes. This is so the air moved by the constantly spinning supercharger gets "dumped overboard" which takes the load off the SC during cruise. It closes only when you step into it and vacuum drops enough for the internal spring to close it which allows it to build boost. The surge valve in a supercharged application is totally different from a turbo applications blowoff valve (which as you said is normally closed until one lets of the throttle under boost, which opens it to prevent compressor surge.)
My thinking was given my centrifugal application it would be best to keep the amount of air moving through the IC at a minimum during cruise conditions by putting the surge valve between the supercharger and intercooler; this would allow the IC to become as cold as possible. The only bad thing is that the valve would be placed on the "wrong side" of the restriction (throttle body) so when I snap off the throttle from a boost condition a good amount of the pressurized air would have to turn around and go back through the IC and out the surge valve.
It's probably not a big deal at all to put the surge valve just prior to the throttle body; if the IC is sized right it would be more than adequate to cool the non-pressurized airflow that will be constantly moving through it at cruise conditions with the surge valve open.
This will be a fun install... slice the radiator support, scoot the radiator back about 3", relocate my AC condensor rearwards to match (and redo the hoses to remote mount the receiver/dryer), try to fit the IC around the hood latch (or ditch it completely and run pins or those Aerocatch latches), and finally I'll need to squeeze in 3 coolers for oil, power steering, and fuel.