@L31MaxExpress Always coming through with excellent data and above average results, that system is performing really well!
I've got a heavy duty clutch (an upgrade from standard duty that was on it) that's about 2 years old. Fan is the newer model 11 blade composite variety. This combo will suck a microfiber cloth to the grille at idle with no issues. Shroud is in good condition as well and the fan fits in it correctly.
@cjcb1100 looks like your performance is similar to mine.
Side note, our discussion about the TXV's got me thinking about how these systems changed over the years.
This chart is K1500 suburban specific, but I found it interesting to see what GM did to develop and tune the R12 to 134 conversion process.
Ultimately, cooling of the condenser isn't my limiting factor. I can soak down the condenser with mist and drop the high side way down and it'll still be around 45-50 psi on the low side.
What drives low side pressure? In my view, it's a combination of (1) cooling through the condenser, (2) suction of the compressor, (3) the metering of the refrigerant through front and rear valves, (4) heat load on the evaporator, and (5) refrigerant charge in the system... anything else?