[wwest]

Originally Posted by Discseven

TY for comments Will.

Goal was to bring system to near optimal meaning it would operate near its freeze threshold here in Miami---ambient moisture taken into consideration. Given an earlier test comparing temp in outlet of AC blower to vent with +1 dF delta at vent, and core temp test with temp dropping below 32 (albeit with no blower positioned), and driving v-temp at 32+ dF (speed 2 at around 85 outside ambient)... seems safe to say evap is operating at near optimal now.

Yes, excellent job on your part, EXCELLENT!

But "evap....at/near" But what about the SYSTEM at/near. I am of the belief that the compressor you "upgraded" to has less pumping capacity vs RPM than the factory original. What happens when you raise the engine RPM, the supply of liquid refrigerant to the TXV rises accordingly?

Once upon a time I had noisy AC that blew near cabin temp air. Improvement is understatement. Perfect not necessary. My toying further with system is for fine tweaks and better understanding.

Insofar as preventing freeze-up, "perfect" is necessary.

Will system hold 32+ dF at vent when ambient is 95 dF during mid summer? Will system now be able to flush car of internal heat reasonably fast after car's been parked in direct sun for 30 scorching minutes? We'll see when next summer comes.

Speaking of summer, subject of Targa roof insulation was raised. Don't recall where discussion went on that---insulated...or not(?) With extra roof on hand, am planning to take it apart to find out (and rebuild it.) From what I know, there's exterior skin, then burlap, then metal, then headliner. Seems there's better insulate than burlap to use. Be good for Targa roof expert to chime in.

I'm in Boise, 37.8dF this AM, with the '78 at the moment, I'll check the top and egt back to you.