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LQ4 measured airflow

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Old 07-20-2024, 12:04 PM
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Default LQ4 measured airflow
Hey guys, I'm contemplating gutting the cats on my 2003 1500HD due to the truck having many miles of severe misfires under the previous owner. I was wondering if anyone could provide airflow data for a healthy LQ4 that I can monitor under WOT with my scan tool so I can have a before and after comparison to see if opening up the cats provided any actual increase in breathing.

Appreciate your input.
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Old 07-20-2024, 12:30 PM
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Unless they are plugged, it won't.

You can simply un bolt them at the manifold and see if you notice a difference.
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Old 07-20-2024, 02:47 PM
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Originally Posted by 1FastBrick
Unless they are plugged, it won't.

You can simply un bolt them at the manifold and see if you notice a difference.
i just logged it at 266g/s max at WOT near redline which is just over 35lbs/hr. Plenty healthy for a stock LQ4. 310000km on these cats.
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Old 08-21-2024, 01:26 PM
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Originally Posted by cletuz
i just logged it at 266g/s max at WOT near redline which is just over 35lbs/hr. Plenty healthy for a stock LQ4. 310000km on these cats.
You need CATS in Alberta ?
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Old 08-21-2024, 06:35 PM
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Originally Posted by Fullpower
You need CATS in Alberta ?
No smog testing here.
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