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Old 02-13-2003, 08:06 AM   #1
Scooby Specialist
Member#: 21274
Join Date: Jul 2002
Location: Western Mass
2002 Mc_Bains car
I use to have a WRX :(

Question Does removing the snorkus lean the fuel mixture?

Now I did a bunch of reading on this subject and I can see how a CAI that moves the MAF would create turbulance and could change readings but does just removing the snorkus and keeping the stock airbox with a ITG type filter lean the fuel mixture.I mean real af ratio proof not he said she said.

Thanks Bill
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Old 02-13-2003, 09:59 AM   #2
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good question- never thought of it.


I'm sure someone has a a/f gauge and can do a little experiment- though that may also be negated by engine mgt, but only time will see I guess.

speed safely

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Old 02-13-2003, 10:01 AM   #3
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I'm not seeing anything weird with mine removed. Since air still travels the same direction from the box to the airflow meter, I would say that it won't cause a lean condition. The airflow meter still gets accurate readings. -Bolster
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Old 02-13-2003, 12:01 PM   #4
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i think the ODBII adjusts that after a while.
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Old 02-13-2003, 03:16 PM   #5
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2002 E46 M3
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No change in mixture with the silencer/snokle removal.

The MAF is still in its proper housing, and any flow patterns that exist because of the silencer/snorkle are wiped out by the filter anyway.

Some CAI's cause a lean condition because they put the MAF sensor in a different housing, in a different flow path. If the intake tube diameter isn't exactly the same shape, the MAF can't determine volume, since all it knows is air velocity.

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Old 02-13-2003, 03:22 PM   #6
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There shouldn't be a difference with it removed/installed.

I don't think moving the MAF is the problem. The problem is the tubing diameter.
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Old 02-13-2003, 03:24 PM   #7

Chunky , you hit the perverbial nail right on the head.

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Old 02-13-2003, 03:25 PM   #8
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2005 Big red


The car idles at 14.2-14.9:1 acording to the Utec without the silencer/snorkle.
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