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-   -   Questions about my 14 F150 (http://www.f150forum.com/f38/questions-about-my-14-f150-267173/)

mark1969 07-21-2014 04:03 PM

Questions about my 14 F150
 
I recently purchased a new 14 F150 SCREW 157" 4x4 EB. A few things after having her a couple weeks. (3.31 rear end )

First off mileage, averaging around 16mpg mixed with mostly city driving. ( average I guess? )

Towing was abysmal. Plenty of power, I could pull my 8K lb TT uphill at pretty much any speed that was sane. Mileage however averaged about 7.5 equal to or maybe even a hair less than my old F350 2v V10. Felt stronger than my old truck but the mileage :censored:

Maybe it'll get better with a few thousand miles???

Now on to the other issue. It seems when it's getting started pulling I can feel an ever so slight shake as it gets up from a stop to around 10-15 or so mph when slowly accelerating. I dont recall ever feeling this on my F350. Normal or ?

Also when driving slow speed with my TT behind I could hear a loud hiss from up front, was this possibly just the fan or ??


Outside this, the truck is amazing. I cant believe how quiet and comfortable this truck is.

This is only my 2nd F150 the first being a 92 ( loved that truck ) It does seem though that the door skins and tailgate must be made of some awfully thin sheet metal, alot of flex and much more so than I remember on my other trucks. Only my old Tacoma had as much sheet metal flex. I imagine this is wieght savings but a costco parking lot left me a ding in my tailgate already. That'll piss a guy off lemme tell ya. A week old truck with a dent ..... Dammit. I'll be calling a PDR guy for that one.


One more thing, I bought the E locker rear end. I assume when it's not active it's just an open diff or is it an LS ? I used the E locker backing up my TT up loose dirt hill in a remote campground and it works beautifully.

Thanks for any help fellas.

joedotmac 07-21-2014 04:25 PM

Quote:

Originally Posted by mark1969 (Post 3607237)
I recently purchased a new 14 F150 SCREW 157" 4x4 EB. A few things after having her a couple weeks. (3.31 rear end )

First off mileage, averaging around 16mpg mixed with mostly city driving. ( average I guess? )

Mileage will get marginally better. The EB marketing doesn't live up to owners expectations across all owners. Some have fantastic mileage though like you mine is on the lower percentile MPG of all owners.

Quote:

Towing was abysmal. Plenty of power, I could pull my 8K lb TT uphill at pretty much any speed that was sane. Mileage however averaged about 7.5 equal to or maybe even a hair less than my old F350 2v V10. Felt stronger than my old truck but the mileage :censored:
This is standard course from my experience. A smaller engine pulling the same load seems to get worse mileage. Got to be some point of diminishing return aspect here. Plus with the the addition HP your supporting with the EB, it requires more fuel to support. There's something called Brake Specific Fuel Consumption (BSFC) which basically states to support X horsepower requires X amount of fuel. Thus if your using 365HP it's going to take more fuel to support say 310HP.

Quote:

Maybe it'll get better with a few thousand miles???
Yes expect modest improvement in the future.

Quote:

Now on to the other issue. It seems when it's getting started pulling I can feel an ever so slight shake as it gets up from a stop to around 10-15 or so mph when slowly accelerating. I dont recall ever feeling this on my F350. Normal or ?
This is a common issue with the F150 157" wheelbase. Most owners have the condition.
Quote:

Also when driving slow speed with my TT behind I could hear a loud hiss from up front, was this possibly just the fan or ??
That's likely the BOV venting off excess boost from the compressor side of the turbo. Normal functionality.

Quote:

One more thing, I bought the E locker rear end. I assume when it's not active it's just an open diff or is it an LS ?
When not engaged it's an open rear differential. No limited slip feature.

Spong 07-21-2014 04:35 PM

So what's the deal with the shudder? I watched the posted video, very strange! Looks almost like the driveshaft warps or something?

obusnizzle 07-21-2014 04:41 PM

Quote:

Originally Posted by Spong (Post 3607276)
So what's the deal with the shudder? I watched the posted video, very strange! Looks almost like the driveshaft warps or something?

Im going to venture that is is producing a whipping motion due to the length of the driveshaft.

joedotmac 07-21-2014 05:04 PM

Drive shaft is longer, two piece design with slip yoke. Somehow the slightly different drivetrain configuration allows an oscillation to be introduced.

obusnizzle 07-21-2014 05:20 PM

Quote:

Originally Posted by joedotmac (Post 3607323)
Drive shaft is longer, two piece design with slip yoke. Somehow the slightly different drivetrain configuration allows an oscillation to be introduced.

Ford had the aame problem with the crown vic and thinderbird. P71 cars got a one piece driveshaft, thunderbird got nothing. Early mark 8's had changes, too.

Spong 07-21-2014 06:08 PM

Interesting. Glad I didn't get the 6.5' box now! I'm guessing it effects all 157" wheelbase regardless of engine?

dosman 07-21-2014 06:17 PM

Quote:

Originally Posted by Spong (Post 3607411)
Interesting. Glad I didn't get the 6.5' box now! I'm guessing it effects all 157" wheelbase regardless of engine?

2013 Plat, 5.0, 3.55, 157". Mine has never done that over its first 1 1/2 years.

KILOFINAL 07-21-2014 06:27 PM

Hey.......what's with the rusted drive shaft???? I'm bored.....

joedotmac 07-21-2014 07:18 PM

Quote:

Originally Posted by dosman (Post 3607431)
2013 Plat, 5.0, 3.55, 157". Mine has never done that over its first 1 1/2 years.

You're lucky. Mine will do it with as little as 300 lbs in the bed. Some are doing it without anything in the bed. The symptom seems to announced itself considerably with a moderate load or tow. Seems to get worse the more it's loaded.


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