intake equal mpg? - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 18 (permalink) Old 03-12-2009, 02:42 AM Thread Starter
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intake equal mpg?

Does anyone know how much an intake helps mpg? afe, tymar, do it your self tymar, or any type other than a k&n, don't want on of those. any suggestions?

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post #2 of 18 (permalink) Old 03-12-2009, 05:45 PM
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Re: intake equal mpg?

They help very little with MPG, like less than 1 mpg. In terms of MPG any of the aftermarket stuff is going to be the same as the next. Theoretically ones that remain a cold air intake would have an advantage over the open element in the engine compartment.

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post #3 of 18 (permalink) Old 03-12-2009, 06:47 PM
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Re: intake equal mpg?

i'd say less than 1/2 mpg. it will however help more when towing or driving heavy in my experience.
towing 7-8k in firewood, I was running about 13.5-14 mpg... after the intake, I was seeing more like 15.2-15.5, same path, same speed, similar temps and humidity... etc etc.

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post #4 of 18 (permalink) Old 03-12-2009, 11:51 PM
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Re: intake equal mpg?

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Originally Posted by secondarychaos View Post
i'd say less than 1/2 mpg. it will however help more when towing or driving heavy in my experience.
towing 7-8k in firewood, I was running about 13.5-14 mpg... after the intake, I was seeing more like 15.2-15.5, same path, same speed, similar temps and humidity... etc etc.
That's interesting. Do you have a log that you keep to substantiate your towing results?

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post #5 of 18 (permalink) Old 03-13-2009, 12:18 AM
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Re: intake equal mpg?

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That's interesting. Do you have a log that you keep to substantiate your towing results?
It wasn't very consistent (my input) at that time, but yes. Three trips entered before, two after with the intake only.
May also make a difference that the majority of the hard pulls on the route are at 5000+ elevations.

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post #6 of 18 (permalink) Old 03-13-2009, 02:56 AM
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Re: intake equal mpg?

I put a Baldwin PA2818 on my truck and got ZERO improvement in MPG. I think trying to improve MPG by freeing up either intake or exhaust is just gas engine thinking.

You got a diesel. Think like a diesel.

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post #7 of 18 (permalink) Old 03-13-2009, 03:11 AM Thread Starter
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Re: intake equal mpg?

thanks for the input

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post #8 of 18 (permalink) Old 03-13-2009, 04:30 PM
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Re: intake equal mpg?

The difference would be small if you work the truck hard and non existant if you don't.

Hot air intakes get better mpg than cold air intakes. Has to do w/ lower vaporization temps or something.

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post #9 of 18 (permalink) Old 03-13-2009, 10:01 PM
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Re: intake equal mpg?

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Originally Posted by Dave Whitmer View Post
I put a Baldwin PA2818 on my truck and got ZERO improvement in MPG. I think trying to improve MPG by freeing up either intake or exhaust is just gas engine thinking.

You got a diesel. Think like a diesel.
I think you are correct. After I had my intake exhaust for a while, I learned that there is no difference in mpg. The chip gave me between .5 to 1.5 mpg in the city depending on driving conditions. Highway driving made no difference with the chip or without the chip. Its the placebo effect when you first get the stuff, but eventually you wake up.

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post #10 of 18 (permalink) Old 03-18-2009, 07:42 PM
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Re: intake equal mpg?

This is the text of the thread I started on another site when I did the open element intake in August of 2001. Mileage did not change measurably (less than .5 MPG gain on an otherwise stock truck). As noted, in my opinion the open element filter by itself does not make a lot of difference but with other mods it helps things to work better (sometimes MUCH better).

Quote:
I did the open air filter mod today. I got base line times for the stock air filter and did times for the open filter this afternoon.

Truck: 1995 F-250 Power Stroke 5 speed extended cab long bed, 3:55 gears, aluminum cab height bed cap, 235/85 x 16 steer tires, 255/85 x 16 drive tires

All measurements on level road with A/C off.
All times are an average of four separate runs
3 - 55 mph was starting at idle, clutch engaged in first gear (did not want to trash my new $1,400 clutch), shift points 3100 rpm.

Mileage figures are for unloaded driving, moderate acceleration (shift points 16 - 1800
rpm, - throttle) using #2 Marathon diesel. Base line MPG is over 4-5000 miles, MPG after modification is for a load of fuel, 400+ miles and will be reported next week some time. Mileages calculated mathematically. I don't have a trip computer and would not trust it if I did.

Base line performance, no modifications.

55 - 75 mph top gear roll on .... 12.04 sec

3 - 55 mph ...................... 13.25 sec

MPG ............................. 19.2

After installing Napa open element air filter with 4" exhaust pipe adapter in place of factory air filter assembly (times measured as above):

55 - 75 mph top gear roll on ...... 12.15

3 - 55 mph ........................ 13.40

MPG To be reported in a week or so.

What this tells me is there is no discernible difference before and after this modification on an otherwise stock engine. My gut feeling is the factory downpipe is the restriction in air flow and the air filter would make a difference with an aftermarket downpipe. Turbo whine is not noticeably louder, there is a little more intake rumble though any time I am over 1/4 throttle.
Dave / Believer45

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