MAF placement

Basic tech questions such as future setups, different turbo kits, car diagnosis, etc
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YadPwns
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MAF placement

Post by YadPwns »

Good morning guys, I did some searching and read on the placement of the MAF . Two things that came up were blow through and draw through setup . I have not had any hands on with this so my question is what is blow through and what is draw through? I planed on placing mine on the compressor side of the turbo on the flange that sticks out (don't know the correct terminology ) . That's what I've always seen done. Any help would be greatly appreciated. (Pictures would help big tine)
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supakat
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Post by supakat »

Blow through placement: MAF is on cold side pipe before TB.

Draw through placement: MAF is pre turbo connected to the inlet.

If running draw through, recirc of the BOV is recommended. If blow through, then you can vent to atmosphere.
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YadPwns
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Post by YadPwns »

supakat wrote:Blow through placement: MAF is on cold side pipe before TB.

Draw through placement: MAF is pre turbo connected to the inlet.

If running draw through, recirc of the BOV is recommended. If blow through, then you can vent to atmosphere.
So in a blow through setup the maf will actually see boost pressure and in a draw through setup there is unmetered air correct?

Are there any advantages to blow through placement other than venting into the air ?
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supakat
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Post by supakat »

MAF systems do not see psi like MAP systems do.

Another blow through setup advantage is that if you blow a coupler and have to drive with it off, it will still run like normal but no boost. If draw, it will run rich until the coupler is fix.
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MRLuke
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Post by MRLuke »

A MAF will restrict the size of your intake pipework on a draw through setup, but on blow through you will be able to run more power before it becomes a restriction.
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Build Thread: viewtopic.php?t=53366
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YadPwns
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Post by YadPwns »

Awesome, thank you guys for the knowledge. :wink:
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