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Depends on the car. If it is naturally aspirated (no turbo or supercharger), then it's easy.
Cylinder pressure = 14.5 (1 bar) * Compression Ratio.
If however, it's forced induction:
Cylinder pressure = ( 14.5 (1 bar) + Boost psi ) * Compression Ratio.
For instance, in a naturally aspirated car with a 10.0:1 Compression Ratio :
145 psi = 14.5 * 10
Or in a turbo car with the unreasonably high 10.0 compression ratio with 10 psi boost :
245 psi= ( 14.5 + 10 ) * 10
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