Please don't take this as an attempt to contradict you, as I SUCK at math, and I'm only going by these equations that _other_ people show me and the equation you gave.
Originally posted by "400hp930"
Here is a good rule of thumb equation for calculating how boost will effect things such as the stock normally asperated (SNA) compression ratio and power.
Boosted-Value = (Boost+14.7) * Flow Efficiency * SNA-Value / 14.7
Flow efficiency will vary depending on such things as cams, valves per cylinder. intercooler, plumbing, etc but a good rule of thump to start with is 0.8 (80% efficiency).
When it comes to compression ratios there is only so high you can go before a usable mixture will spontaneously combust creating detonation issues (which in a highly compressed motor will usually result in destroyed pistons and related problems). You will usually never want to go over an adjusted 13/1 compression ratio. This is the reason why a turbo or blower on a car with 10/1 compression should not be set to more than 8-10 PSI.
(7+14.7)*.8*127/14.7
149.980
Where in the equation is the compression ratio? Where does it come into play?
See I had a 9.5:1 static ratio. Under boost a comp ratio calculator says I had 14.02:1.
Is this not healthy for my motor? it was only 7psi... With my now 9:1 pistons I would like to run 10psi (with fuel upgrades) this will bring my comp ratio to 15.12:1. Will I break stuff with such a high ratio?
(Comp calc) http://www.smokemup.com/auto_math/eff_cr.php