Artsi_L

Found a HX40V charger compressor map, used in a 7,8 liter IVECO engine. It even has a comparison curves between wastegated and variable geometry chargers. Neat.

Please do not fail to click the 'view full size' text at the bottom of linked page.


http://community.webshots.com/myphot...ecurity=zGyKvq

NMCTD

nice find!!! I wouldn't mind trying out a VGT once I get some goodies for my truck

Ph4tty

I just wish a compressor map meant something to me

Presure vs air flow makes sense, but the circles around them?
I aced calculus, but am still clueless. Sombody pm me and beat some sense into me piz

Thanks for posting artsi- nice find

Artsi_L

The airflow axis has a cubic meter format, rather than lbs/min as what Holset usually uses.
I visited following web page to find attached formula to do conversion to lbs/min flow. (Note, formula has flow per second, and compressor map has flow per an hour !!!)

http://www.ztechz.net/id6.html

1 m³/s = 2118.88 cfm, 10 lb/min = 144.718 cfm

HOHN

Circles are "efficiency islands" and show the efficiency: 60%, 70%, 80% etc.

The other radii are shaft speed in RPMs (80,000; 90K, 100K, etc)

A compressor maps relates shaft speed to 1) pressure ratio 2) airflow, properly listed in POUNDS of air (mass), and 3) efficiency

jh

high country

this will pretty much fill every last bit of brain space you have left with turbo information.

http://www.turbomustangs.com/turbotech/main.htm

hope ya got a couple minutes.

Artsi_L

This site ain't too bad either:
http://www.gnttype.org/techarea/turbo/turbopage.html