So far at 80 degrees ambient temp I can only get it to 32psi at idle on max ac and close to 40 on the regular ac setting. It sounds like there's a leak near the high side port, but its not the port. It does it for a few seconds after turning car off. It gets cool but not quite right yet. Gonna look into the air noise coming from the front driver side of the car. I hope its not my condenser.
Low side rises to around 70-80 ish when ac turned off.
I finally got it working well. I've seen it drop to 37f in the vent, averages 39-41f on the highway. The car is still not freezing inside though when its warm out. I figure that's a limitation of an economy car
Oh note, my dads 2018 chevy 5.3 silverado averages 43f on the highway but gets a lot colder inside the cabin. He has a lot better airflow from the vents.
Sorry about the double post here. It sits around 47psi on max ac at about 95f outside temp. Seems about right I guess. If I get it higher(psi) the vent temp rises several degrees. Same with less psi than 47psi. So 47 must be the sweet spot.
I used a ac temp gauge in the vent to get it as close to perfect as possible. O Reilly has them for about $8.