doing a school project need some help

[240kid]

just need to know how to determine turbo and intercooler efficiencies (specfically compressor efficency ....or a link to a site that tells you (i could not find one nor do i know how to calculate comp eff from a graph) I am going to be comparing a stock t25 to an RS49T and a stock sidemount to a greddy 24v fmic. any input would be great

 

[brute]

Intercooler efficiencies are generally quite similar. The main determinant is whether it's bar/plate or tube/fin. As far as compressor efficiencies, just look at a compressor map. It will be different for different conditions (atmospheric pressure, pressure drop, desired boost, displacement, volumetric efficiency, et al.).

 

[vc_wannabe]

http://www.stealth316.com/2-turboguide.htm

I'm credited on the site. All the information you should need.

 

[tkelly27]

http://www.gnttype.org/techarea/turbo/intercooler.html

That's a good way to determine IC efficiency. If it's a school project (depending on the school) you should be measuring these things...

*edit* That GN site didn't really say anything about efficiency. Put heat exchanger into wikipedia, should give you a formula for efficeincy, dunno about w/pressure loss. AH! outta time @ work!

If you have a datalogger that can track boost, and a known ambient boost pressure, you should be able to use the maps to get a really accurate reading on turbo efficiency for many different points. Look up "how to read a compressor map" if you want to know what all the numbers mean, and conversions for lb/min to kg/sec and the like can all be had through google.

Also, check out "Maximum Boost" from your local library, lots of good information and it steps you through a few calculations.