AFE cold air intake and gas mileage - Diesel Forum - TheDieselStop.com
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6.0L Power Stroke Engine and Drivetrain Discussion of the 6.0L Power Stroke diesel engine and drivetrain in the 2003-Up Super Duties and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.0L Power Stroke engine.

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Old 02-08-2007, 12:57 PM   #1 (permalink)
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AFE cold air intake and gas mileage

My 07 powerstroke gets 12 mpg in the city. I have had an AFE cold air intake system with turbo back exhaust system recommended boasting an 18-20 mpg gas mileage after its installation. any truth to this?
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Old 02-08-2007, 01:01 PM   #2 (permalink)
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Re: AFE cold air intake and gas mileage

I guarantee you their boasted MPG wasn't in the city!

One of the things Ford got really really *right* with the 6.0L launch was the Donaldson air filter (well conceptually; a lot of people don't like the cosmetics of the case or the pain of changing it.) They got it so right that it's offered as a retrofit for 7.3L trucks. I believe if you are going to flow any more air than the stock setup, you have to do it by filtering less, i.e. risking more dirt in the turbo and engine.

So I am going to go out on a limb and say all 6.0L aftermarket air filters are a waste of money and potentially damaging to the engine. (I bet I'm gonna hear about that!)

Duncan
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Old 02-08-2007, 01:38 PM   #3 (permalink)
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Re: AFE cold air intake and gas mileage

Duncan, I agree with you totally. One thing about most of these aftermarket filters is they achieve much of their efficiency through the use of tackifier. Tackifier does 2 things always. It migrates (blows off the filter downstream) and it dries out over time. As it dries it begins to release oily dirt which will build up on your turbo blades until it sluffs off as agglomerations of dirt directly into your engine. Filters that work because the pores are small enough to exclude dirt particles (strainers) are much safer in this application. In fact I wonder how many trucks which have had various types of problems with turbos or injectors have been equipped with these aftermarket filters. The really confusing thing here is that these filters have often been tested by Independent Laboratories to back up manufacturer claims. These tests are done by loading these filters with a test dust over a very short period of time. In these tests the filter cake isn't subjected to the constant vibration which the filter in your truck experiences. This vibration will cause some unloading of the filter. It isn't subjected to the heat either which causes accelerated drying of the tackifier. The loading isn't gradual over an extended period of time either which will effect how the dust loads into the filter. For this reason none of these tests run with medias which aren't true strainers are valid. They all will yield results which differ greatly from the real world environment your truck lives in.
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Old 02-08-2007, 02:32 PM   #4 (permalink)
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Re: AFE cold air intake and gas mileage

plus it's an 07. Don't diesels get better mpg after they are broken in?
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