Trying to find a thread for the larger valance gaining mpgs - Ford Powerstroke Diesel Forum
 
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post #1 of 9 Old 11-17-2013, 04:59 PM Thread Starter
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Trying to find a thread for the larger valance gaining mpgs

I've searched around for the piece someone here had about the bigger lower valance increasing mpgs vs the shorter valance. Currently my dad doesn't have any valance because of a plow mount and was telling him that I read ford updating the valance to the larger one in 08 for economy and gained around an mpg. Was trying to find it so he could read it.




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post #2 of 9 Old 11-17-2013, 07:25 PM
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I have also seen people who have went to the larger valence and gained MPG. Of course it depends on your setup. I don't think someone with a leveling kit and 35s is going to see an increase but a truck in stock form should. A 2wd would probably see even more since it will be even closer to the ground

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post #3 of 9 Old 11-18-2013, 02:46 AM
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I guess I will be keeping my larger valance!
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post #4 of 9 Old 11-18-2013, 05:25 PM
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I swapped my larger valance for the smaller Job 1 and didn't see a difference. But I'm also running a 6" lift, heavier 22" wheels, and 35's.

- Rob
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post #5 of 9 Old 11-18-2013, 05:37 PM
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that info is out there I remember reading it when it first was published

and thinking BS LOL

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post #6 of 9 Old 11-18-2013, 05:55 PM
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Here are two threads discussing the two sizes...

Possible MPG Ford mod coming out

job 2 or 3 valance on job 1

Also came across this posting on another forum related to this topic:

"I have a report from CAT diesel addressing rv coach performance and in it, it states, "above 55mph, the Aerodynamic Resistance horsepower becomes more significant than the Rolling Resestance horsepower". It goes on to say, "Looking at the 34,000 pound coach, when speed increases from 65 to 70mph, the engine must develop an additional 31 horsepower to meet the Total Wheel demand horsepower. This is a significant 20% increase! Aerodynamic Resistance horsepower accounts for 25 horsepower and represents 80% of the increase." Aerodynamics do matter." - CaptSkup on TheDieselStop

- Rob
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Last edited by WydOpen; 11-18-2013 at 06:05 PM.
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post #7 of 9 Old 11-18-2013, 06:53 PM
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Depends on driving too. My valance is sitting in the rafters of the garage because of my snow plow bracket. If I put mine on I won't see a difference because my truck does hardly any highway driving. And my sig pic is older, I'm on factory 20's with factory tire size again. So no more wide trail grapplers slowing me down. Unfortunately mileage hasn't really picked up but we prolly just changed to winter blend fuel here so that could be why.

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post #8 of 9 Old 11-18-2013, 07:17 PM Thread Starter
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That was the link. I was curious because my dad has a 2010 single cab 8' bed, 2" level stock 20" wheels and tires, 3.55 ls, and the same intake and H&S as me with a dpf delete. And he gets worse mpg than my crew cab, 3.5" level with 35s... My dad drives like a grandpa and I don't. I set his programming the exact same as mine. Our speedos are calibrated correctly according to GPS. I was just wondering since he has a plow mount up front with no valance.




08 F350 crew 4x4
H&S mini, Sinister egr delete, cold side pipe, 5" straight pipe, S&B intake, 3.5" level, Newton bars, coolant filter, 325's duratracs, ARP studs, 6.0 manifolds, flow pro DP, Detroit truetrac, triple disk converter, led bed lights

79 F350 4x4 460ci
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post #9 of 9 Old 11-18-2013, 07:19 PM Thread Starter
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I do also have a full 5" exhaust vs just his dpf delete pipe w/ stock tail pipe. But wouldn't think it would be almost 1 mpg difference.




08 F350 crew 4x4
H&S mini, Sinister egr delete, cold side pipe, 5" straight pipe, S&B intake, 3.5" level, Newton bars, coolant filter, 325's duratracs, ARP studs, 6.0 manifolds, flow pro DP, Detroit truetrac, triple disk converter, led bed lights

79 F350 4x4 460ci
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