How does incoming air temperature affect peak boost in air compressors?

[TonyG]

...I reposted this in general physics forum here (http://www.physicsforums.com/showthread.php?s=&threadid=10813&perpage=12&pagenumber=1). Tried to delete this one, but was denied access.

[Tyro]

Tony, from our PM correspondence, you seem to have access to a rig IRL (correct me if I am wrong). Could you try testing with either just the compressor alone, or the engine without the compressor, under winter and summer conditions?

I am trying to see if the improved efficiency you spoke of came from the engine or the compressor due to better pressure ratios.