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PSI stands for pounds per square inch. This is a standard measurement of pressure. In regards to turbo, psi is also referred to as "boost".
Rule of thumb:
1 PSI boost (pressure) produced by a turbo compressor is equal to 10 +2 horsepower gain. This is directly proportional to a few aspects. The number one being the fuel management combination and it's tunability. The atmospheric pressure at sea level and ambient temperature (in other words, the location of the car) is also significant, performance wise.
An example:
To maintain optimum performance, if a car is tuned in Florida and made 400 HP and the same car and engine is relocated to Colorado, the tuning must be redone. Again, this is for optimum performance. Oxygen levels and temperature in general can easily affect a highly tuned race car. This same car may or may not make the same 400 HP if relocated in Colorado. The density of air greatly affects performance of any internal combustion engines and gas turbine engines. The lower the temperature of air, the more dense it is.....
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