CFM Ratings from MAF to Intake Manifold

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Sep 23, 2003 | 11:40 PM

Brody

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CFM Ratings from MAF to Intake Manifold

Ignoring filter and heads, what is the CFM rating of everything between them? (MAF, Air Bridge, Coupler, Throttle Body, and Intake Manifold)

I'd love to hear results from C5 of F-Body, but specify what you're talking about. (eg LS1 vs LS6 manifold)

Sep 24, 2003 | 08:51 AM

BAD XXX

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Re: CFM Ratings from MAF to Intake Manifold

I believe it's 780 cfm.

Sep 29, 2003 | 11:33 PM

Brody

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Re: CFM Ratings from MAF to Intake Manifold

What is 780 cfm? Break it down by part if possible.

Sep 30, 2003 | 01:47 AM

blk~2000~Z28

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Re: CFM Ratings from MAF to Intake Manifold

Quote:

What is 780 cfm? Break it down by part if possible.

It seems pointless to do this since they will never each be used without the others.

Sep 30, 2003 | 11:11 PM

Brody

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Re: CFM Ratings from MAF to Intake Manifold

It sure would be nice to know where the bottlenecks are, and at what points the other components become one. It's NOT pointless to better understand our cars.

Oct 1, 2003 | 03:01 PM

Cal

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Re: CFM Ratings from MAF to Intake Manifold

The bottle neck is the throttle body and the throttle body opening in the intake manifold. Actual cfm depends on the presure differential you are measuring it at, but I think it's around 800 cfm using the normal standard. Replacing the TB with a bigger one is easy; the problem is you can't port the intake manifold because the plastic is thin and oddly shaped. The new LSX intake manifold may give us some relief, but at a hefty price.

Oct 5, 2003 | 05:09 PM

Brody

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Re: CFM Ratings from MAF to Intake Manifold

Thanks Cal! Do you happen to know what CFM F-Body and C5/Z06 intakes flow? What about a Donaldson blackwing?

I know I didn't ask about those things initially.