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post #1 of 8 Old 12-16-2005, 07:31 PM Thread Starter
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cfm question..

Does anybody know how to figure out how much cfm a turbo will pull in at a given rpm?

Edit - I know theres several variables, like what kind of turbo/trim/this/that...but is there a general rule of thumb?


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post #2 of 8 Old 12-16-2005, 08:43 PM
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Most turbos have a compressor "map" that helps with this.

i learned a ton from http://forcedinductions.com/ .... maybe that will help you.

not 100% sure how to calculate it, though.

JD

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post #3 of 8 Old 12-16-2005, 10:06 PM
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You need to clarify your question before a good answer can be given.

When you ask "how much cfm a turbo will pull in at a given rpm?", are you refering to engine RPM or Compressor RPM?
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post #4 of 8 Old 12-16-2005, 10:12 PM Thread Starter
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Quote:
Originally Posted by gt93mustang
You need to clarify your question before a good answer can be given.

When you ask "how much cfm a turbo will pull in at a given rpm?", are you refering to engine RPM or Compressor RPM?
My initial thought was engine rpm.
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post #5 of 8 Old 12-16-2005, 10:14 PM
 
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lot's of variable's on that one........when you aren't at boost level's, the empeller's are still spinning....and when you are at boost the moving air is huge.
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post #6 of 8 Old 12-16-2005, 10:59 PM
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If you're talking about engine RPM, then there's no way or saying for every engine at X RPM, a turbo is producing Y CFM. CFM produced by a turbo relative to engine RPM is based on MANY factors, the most important being engine displacement, compressor size, boost pressure, and to a lesser degree, volumetric efficiency and compressor efficiency.

So to answer your question, no, there is no catch-all way of calculating how much CFM is produced by every turbo for every engine combination across the RPM range.

That being said, if you're looking for a calculation on how much CFM a motor consumes at a given RPM, you can use this equation:

Theoretical CFM = (CID * RPM * VE)/3464

This will give you a THEORETICAL CFM, but it should be close enough for our purposes.

Once you know the answer to the equation above at the desired RPM, then you can use that to calculate how much CFM a turbo will produce at that RPM.
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post #7 of 8 Old 12-17-2005, 06:59 PM Thread Starter
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hey thanks gt93mustang
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post #8 of 8 Old 12-17-2005, 08:20 PM
 
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great info joe......
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