Boost/Compression Ratio Calculator
http://rbracing-rsr.com/compression.htm
The link above is for a boost psi to compression ratio calculator. I ran a couple and was quite surprised at what I got!
1) A typical stock 6.5L
You are running 8 PSI of boost at an altitude of 1000 feet. Your motor's static compression is 21.2 :1. At this boost level and altitude your effective compression ratio is 32.54 :1, and without altitude correction your compression ratio would be 32.74 :1.
2) Reduced 18:1 CR and 15 PSI boost
You are running 15 PSI of boost at an altitude of 1000 feet. Your motor's static compression is 18 :1. At this boost level and altitude your effective compression ratio is 36.17 :1, and without altitude correction your compression ratio would be 36.37 :1.
Do these seem correct!? Can our 6.5s (or any diesel) handle this CR!? I was a bit shocked at the effective CR. I came upon this because I was wondering what is the effect of boost to CR. I knew it had to go up but, still I am very shocked.
93 K1500 Ext. Cab, 6.2L D, 4L60-E, 3.73, 174K, 3" exhaust, air cleaner mod, EGR mod, EPR mod (my toy)
04 Dodge Dakota Sport 4x4, 4.7L (gaser), 545rfe, 3.92, 95K (wife's ride now)
98 K1500 Z71, 6.5L TD, 4L80-E, 3.73, 170K, 2.25" Crossover, 3.0" Down Pipe and Exhaust (sold to brother)