ok punisher you need to have some issues worked out man... ok first 300PSI your insane thats going to take your low side temp and put it ofer a chair and get it from behind!. ok yes more freon means more heat load your absolutly right with that one. as you increase your high side preasure your low side preasure goes up and raises the boiling point of the freon DUH same exact reason that the freon becomes a liquid at 150 psi... if you do go streight R290 you will need to add a shot of R34 to it to add weight. R134 not only has chems in it to make it less flamable its also added to increase molecular weight for compression factor. if you want more freon in your system make your condensor bigger simple as that.
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