Boost = Maximum blower boost
14.7 = PSI at sea level
CR = Engine Compression Ratio
Altitude plays an important role in determining compression ratios. If the altitude in
the area where you normally drive is significantly higher than sea level, then your
compression ratios will also vary. To determine the effects of the altitude on a
calculated compression ratio, use the following formula:
Corrected Compression Ratio = FRC – [(altitude/1000)x 0.2]
