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Old 04-03-2009, 06:27 AM   #21
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The x-axis represents the amount of air the turbo is shifting, normally expressed in cfm (just not on that map!!). Maybe this adjusted version of thats same compressor map will be easier to read :

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Old 04-03-2009, 07:41 AM   #22
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ohhhh. ok so then how do I know where on the x-axis a given car falls? What determines if at .6 bar I am producing 215 cfm (75% efficiency) or 300 cfm (70% efficiency)?
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Old 04-03-2009, 08:57 AM   #23
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Quote:
Originally Posted by ThePass View Post
ohhhh. ok so then how do I know where on the x-axis a given car falls? What determines if at .6 bar I am producing 215 cfm (75% efficiency) or 300 cfm (70% efficiency)?
Superhachi.com - Compressor Map Tutorial

The Y axis isn't boost pressure in BAR either, it is pressure ratio. The pressure ratio is:

(boost pressure (in psi) + inlet pressure (14.7 @ sea level) + IC losses) / inlet pressure.
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Old 04-03-2009, 09:44 AM   #24
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Old 04-03-2009, 09:46 AM   #25
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Quote:
Originally Posted by ThePass View Post
ohhhh. ok so then how do I know where on the x-axis a given car falls? What determines if at .6 bar I am producing 215 cfm (75% efficiency) or 300 cfm (70% efficiency)?

that's not how you read a compressor map.

at 14psi from 3000-7000RPM you could travel through the entire heat efficiency island of the turbo depending on the volume air flow produced.
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Old 04-03-2009, 09:53 AM   #26
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Quote:
Originally Posted by BradC View Post
Superhachi.com - Compressor Map Tutorial

The Y axis isn't boost pressure in BAR either, it is pressure ratio. The pressure ratio is:

(boost pressure (in psi) + inlet pressure (14.7 @ sea level) + IC losses) / inlet pressure.

good thing you mentioned that, I was about to correct.

easy formula is 14.7 + boost / 14.7 = PR
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