Am I getting enough air? - Ford Powerstroke Diesel Forum

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post #1 of 11 Old 04-28-2009, 12:57 PM Thread Starter
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Am I getting enough air?

I've got the upgraded stock box (the late 99 version i guess). I zoodad'd, and drilled a few 1" diameter holes around the bottom and sides of the airbox itself, and cut a opening so it could pull air from the fender like the early 99 airbox. I put in an AFE Pro Dry S air filter. I have had a near impossible time finding cfm comparison data of air filters.
anyone out there have an idea if the DIY would flow better? anyone have some air flow data? i'm not sure that with my paltry mods that i need any more air flow than what i'm getting.
Thanks!

Early 99 (7/98) F-350 CC 4X4 AT 7.3L 200K mi - 4" turbo back w/muffler - AFE Stage 2 - PMT1 ECM - DP 40T/DECEL/80E - dual trans coolers - HPX - Fuel CCK - Auto Meter Trans/EGT/Boost - 3.73 - stock tires

Last edited by samiam; 04-28-2009 at 01:03 PM.
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post #2 of 11 Old 04-29-2009, 09:22 AM
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A DIY may not flow any better, maybe some, but it will sure as hell filter better! Get rid of that stock airbox ASAP, they are well known to leak. You should see inside of the "clean" side of mine when I bought my truck...

97 F350 CCLB 4x4 PSD
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post #3 of 11 Old 04-29-2009, 09:39 AM
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I agree with superduty4X4. A straight-flow intake will help. The more corners, the more turbulence, and turbulence equals drag, which will reduce the flow.

The 'downside' of a straight intake is that you will hear your turbo more than stock, and it will only be of any help under full load.

Get a re-usable filter, and you will save money as well as get more space in your engine bay. You will also have a much easier system to maintain and visually inspect for cleanliness.

In my opinion each modification works together with the next, and the last thing I did, was to can the stock box, and go to a straight intake.
That change was just as noticeable as the others, and I just love to hear the turbo 'scream like a demon'
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post #4 of 11 Old 04-29-2009, 11:32 AM Thread Starter
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Now my intake box is the upgraded factory box that was done as a recall on early 99's, so it's not the true early 99 POS. Also, the clean side of the intake box and tube were white-glove spotless a few weeks ago when i checked, and i've got about 15K miles on this intake setup. The point about having less turbulence makes sense though to me, although it's still the same tube leading to the turbo, it's maybe a bit less turbulent getting air into the pipe. i'm wondering if that's some high-level horsepower stuff though, and i'm just not really high-power.

Early 99 (7/98) F-350 CC 4X4 AT 7.3L 200K mi - 4" turbo back w/muffler - AFE Stage 2 - PMT1 ECM - DP 40T/DECEL/80E - dual trans coolers - HPX - Fuel CCK - Auto Meter Trans/EGT/Boost - 3.73 - stock tires
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post #5 of 11 Old 04-29-2009, 11:48 AM
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not really 'Hi-Power' - it's just common sense.

Good to know that your filter is good - that's the most important - next is flow of air.

All fuels burn best with the highest amount of air - and one has to use caution, not to set the engine on fire.

Economy, on the other hand - is also dependent on how well your engine breaths.
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post #6 of 11 Old 05-01-2009, 06:10 AM
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Quote:
Originally Posted by samiam View Post
Now my intake box is the upgraded factory box that was done as a recall on early 99's, so it's not the true early 99 POS. Also, the clean side of the intake box and tube were white-glove spotless a few weeks ago when i checked, and i've got about 15K miles on this intake setup. The point about having less turbulence makes sense though to me, although it's still the same tube leading to the turbo, it's maybe a bit less turbulent getting air into the pipe. i'm wondering if that's some high-level horsepower stuff though, and i'm just not really high-power.
Mine has the late style box too, and it too is a leaky POS. I'll post pics when I get a chance!

97 F350 CCLB 4x4 PSD
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post #7 of 11 Old 05-01-2009, 06:16 AM
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I just posted somewhere about my AFE dryfilter and the huge amount of dirt I just pulled out of my intake... Never again....

2003 F-350 extended cab long box
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post #8 of 11 Old 05-01-2009, 06:49 AM
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I am NO rocket scientist but heres my thought, i to have a stock airbox but i am using a kool-blue high flow filter, oil / fabric type, have the zoodad mod, cut a 3" hole in the air box at the drivers side fender to meet up with the hole in the fender and another in the back side of the box, keeping in mind that ALL the intake air travels thru a tube that is 4" in diameter at the widest point, into a hole in the turbo that is like 2.5" in diameter i would be surpirsed if there is any negative pressure in the stock airbox, i feel sure that i am getting as good amount of airflow as the DIY intake without all the noise...
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post #9 of 11 Old 05-01-2009, 07:00 AM
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Quote:
Originally Posted by ffstreetdoc View Post
keeping in mind that ALL the intake air travels thru a tube that is 4" in diameter at the widest point, into a hole in the turbo that is like 2.5" in diameter i would be surpirsed if there is any negative pressure in the stock airbox
Maybe at idle a stock airbox will have enough air but once you start working that turbo you would be surprised how much air it can pull through that 2.5" hole.


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post #10 of 11 Old 05-01-2009, 07:03 AM
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the stock 7.3L intakes are not that great... either do a DIY intake or spend the extra cash on a good kit like the S&B

-Raul
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