Can't wait to see the results, Jim! I think a lot of people are really curious about what works and what doesn't.

:popcorn2:

I'm going to do this regardless...but it would be nice to know the actual numbers.

Good work!!!!

I'm especially interested now after my "back and forth" with the other member of the f150online forum.

However, I've just returned from an approximately 1400 mile trip to the sunny beaches in Southern California, and I have to say, the truck ran beautifully, climbed the grade out of Indio without effort, just cruised along like it was under no stress at all.

- Jack

no results yet lol im anxious

Me too. But, after our 1326.6 mile, 86.005 gallons of gas trip to and from California, using the homemade CAI and Bill's custom "economy" (non-towing) tune, I can report that I averaged 15.425 MPG for the entire trip. And, I was fighting a headwind for the trip into California. On the way back, the air was calm (half the wind generators in Palm Springs were shut down).

What makes this number significant though, is that before this, I've only seen 15.5 MPG in the 55-60 mph range in calm winds. Any speed faster brought my mileage down into the 14 MPG range. On this trip, we had five people in the truck, it was full of luggage, toys and food, and I was operating in the 70-75 mph range.

So, was this a result of Bill's outstanding tune, my CAI mod or perhaps a bit of both? I really had not had a chance to check this tune on a long trip before this, so I don't have a good base point for comparison.

All I know is, the truck's running better than ever!

- Jack

Sounds great...about 1.5MPG increase WITH the 15-20MPH increase. Can't complain about that. Anytime you can go faster AND use less fuel is impressive.

I did the mod this evening, but won't drive the truck until the morning. My Gryphon is shipping out Monday, hopefully, from PHP and will be installed the day it arrives.

Sweet:cool_beans:

So far on our trip to Florida I am running the canned level 2 tune and the Gryphon is reporting 17.3 MPG! Last fill-up I did the math and it came out to 17.2, so I am happy. That is with 3 people, 1 dog, and truck full of luggage going 75 MPH.

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