Hello, with 30º of temperature and the stopped car you should have more or less 100psi. But if you want to load it there are 2 ways: 1. The easiest with balance knowing the amount of grams it carries. the second is more complicated if you don't know about a / a. also the pressures vary depending on: if the condenser is clean, if the dissipating fins are not bent, the ambient temperature and humidity, etc. regards