Have a '68 that I converted to 134a and installed a reman compressor, new hoses, o-rings, dryer, and expansion valve. Charged it with ~42 oz of 134a and at 88 ambient, the pressures are 43 and 280 with an outlet temp of 72 (idle speed of about 800 rpm). When driving at speed and the outside temp is about 90-95 the outlet temps are about 63-65.
I just purchased a new sticker to go on the compressor that is supposed to be correct for my car. Problem is that it lists the freon quantity as 4.25 lbs, or 68 oz. I have heard that you want about 80-85% of the R12 quantity when using 134a which would give me 54-58 oz.
The sticker also states the system is rated (or tested for; sticker is not near me and I don't recall exactly) for 40 and 300 psi (does this mean it was tested for this as a max and it should never be exceeded or is this what you want to shoot for during operation?).
Seems like my current charge give a little much pressure and does not cool as well as it should.
Question is, how do I find out for sure what the quantity is supposed to be? If it is low, adding more will add higher pressures and I think I am already a little high.
I just purchased a new sticker to go on the compressor that is supposed to be correct for my car. Problem is that it lists the freon quantity as 4.25 lbs, or 68 oz. I have heard that you want about 80-85% of the R12 quantity when using 134a which would give me 54-58 oz.
The sticker also states the system is rated (or tested for; sticker is not near me and I don't recall exactly) for 40 and 300 psi (does this mean it was tested for this as a max and it should never be exceeded or is this what you want to shoot for during operation?).
Seems like my current charge give a little much pressure and does not cool as well as it should.
Question is, how do I find out for sure what the quantity is supposed to be? If it is low, adding more will add higher pressures and I think I am already a little high.
