Originally Posted by Billy22Bob

When a gas expands without doing work - it cools - cockpit evaporator in your AC
When a gas is worked on to compress - it heats - front condenser in your AC

Yesterdays comment was "off the cuff", I just went back into my calc. sheet to confirm.....luckily I wasn't too far off. I even impress myself sometimes....
See attached comparison of OEM v NWDCAI
for stock pulley setup and 14.5psi MAP at WOT and 6200rpm

L8tr - PS - I cant recall where I got the Throttle body drop from but I do recall it was guestimated at WOT somewhere to be about 1psi through the 74mm body. My calc sheet was set up to allow this to be changed to 80-82mm if need be.

Obviously these numbers would be accentuated with the larger cfm's that a pullied setup would impart.
And it works on a squared function - so increase cfm by 10% and you increase the pressure drops by 21% and the temps go lower again.

And - this lower value should be the pressure used when calculating your Pressure Ratio....MAP/SC Inlet pressure