Made a few excel calcs for compression ratio, supercharger max impeller speed and static compression ratio.

once again needs a place to live ftp/website this is an image of the excel file.
Feel free to add in your imput. (and check my math...)

 

Hey...can you input a multiplier that compensates for altitude for us high elevation guys? I believe we can run a bit more boost because effective pressure is a good bit lower up here. (5500 ft ASL)

 

when i'm in socal my car pulls so much harder.

 

CourageOO7
Sure can add a multiplier just need to know what the multiplier is.. If ya have info on boost vs elevation that would be helpful

 

ABV, the formula is:
Effective CR = (Boost + ATM_PSI) * CR / ATM_PSI

The problem is that I don't know what the multiplier is for every 500 ft of altitude (or 1000 or whatever). Here's a chart of what happens:
http://www.engineeringtoolbox.com/air-alti...sure-d_462.html
If we look at pressure at sea level relative to every 500 ft of altitude, it appears that for every 500 ft of altitude pressure drops at a mildly exponential rate. At first the drop is .27 psi for the first 1000 ft or so, then .26, then .25...
I don't know how I would make a multiplier for something that is non-linear. There aren't that many of them. Maybe you could do something like, if x > 0 and x < 500, use .27. if x > 500 and x < 1000, use .27...

Something like that since there aren't many of them? I found a calculator online a long time ago and it was awesome. I found at that at 5000 ft, the effective compression ratio of our motors sanz FI is like 10:1 or something like that.

Ah! Just found it. Check this:
http://www.rbracing-rsr.com/compression.htm

Can someone view the source on that and translate the code?