Dodge Repair Questions? Ask a Mechanic for Answers ASAP
there is no "optimal" pressure it changes greatly with temperature and engine speed the hotter and more humid the higher pressures there are, the cooler it is the lower the pressures, you need to charge the system by installing the correct weight of refrigerant.
pressures are very different across the country, here in connecticut i see 250 on the high side and 25 to 40 on the low side,and can get 48 degrees on teh outlet vents on an "average" day of 80 degrees, in florida my friends thee=re see 300 to 400 psi on teh high side and of course warmer vent temps as well.
you NEED a good set of gauges to get proper pressure readings and a thermometer to see what teh outlet temp is