Thread: Flow Bench Test of kd4crs/Power Hungry/Gotts Mod
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Old Sun, March 22nd, 2009, 06:22 PM
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Quote:
Originally Posted by incogmeo View Post
From another website .... "The 2004s and early 2005s were known to come from the factory in a near lean condition. Any increase at all was enough to lean them out further. Troyer did some dynoing a long time ago and posted the results. Any additional air on these should be done with care and preferrably with custom tunes."

So my questions are:

1. Is this true ?

2. Is it safe to do the air intake mod to a stock 04 5.4 with a K&N drop in filter and no tuner ?

Thanks.
It IS true, but Bill addressed this issue several times. As long as you don't change the environment around the MAF sensor (It's a little thing that sticks out of the driver's side of the intake ducting above and behind the air filter box - there's electrical wires running to it) you won't get a lean condition. The K&N filter is just a filter - it doesn't change the airflow pattern. The homemade CAI is a change way up at the snorkel - it doesn't change the MAF sensor environment either.

So, Bill feels it is safe. I do too.

If you look at the commercial CAI's you'll see they completely replace the ducting all the way to the throttle body. This is a major change to the flow around the sensor and, according to Bill, it really can't see the additional airflow, so, the engine runs lean.

Hope this makes sense.

- Jack
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