Terrible MPG with DPF delete?! - Ford Powerstroke Diesel Forum
6.4L Performance Parts Discussion What has or has not worked for you?

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post #1 of 14 Old 08-23-2010, 11:40 AM Thread Starter
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Terrible MPG with DPF delete?!

I just threw over $1,000 into my truck, hoping to boost my fuel economy from what I was getting with that filter. I have a full 4" downpipe-back exhaust kit, Airaid intake system, and SCT Livewire, tuned at the "Performance" program.

My question is, why did my fuel economy stay the exact same?? I was getting around 11 with the filter (mostly city driving), and I am still getting exactly that.

I have played around with the tunes, and I don't seem to get any better in Extreme, Tow, or Stock programs (all giving me around 11 as well). Highway, I have been seeing around 17-18, which i'm pleased with. Why on Earth is my city MPG so terrible?

I'll also note that the truck smokes a LOT more than I would expect from a Performance tune. It's not just a "puff" of smoke at the initial "pre-boost" acceleration. It's a steady stream of smoke as I moderately accelerate. Even in "stock" program, it smokes wayy more than I'd expect.

Any ideas?

Haywired
Ford F-250 King Ranch
6.4L Power Stroke Turbo Diesel V8
PERFORMANCE::
SCT LiveWire w/ DPF Delete|| 4" downpipe-back exhaust || Airaid Intake || AutoMeter Cobalt LED Gauges - Turbo/Pyro
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post #2 of 14 Old 08-23-2010, 12:13 PM
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Have you thought about going with custom tunes? Also, these trucks weigh a LOT. City driving is not very friendly in the fuel economy department no matter what you do.

Jeff Dodd
spartan_jeff12@yahoo.com

2012 Ford F-250 Lariat CC/SB

Mods - Spartan tuned via laptop, 4" AFE stainless exhaust system, 2.5" PMF BMC leveling spacers, 3" PMF lift blocks, Fox Racing 2.0 shocks, Recon smoked mirror & cab lights
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post #3 of 14 Old 08-23-2010, 05:51 PM
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Should I be happy with the 12 I'm getting in town and the 16-17 I'm getting on the highway on my completely stock truck with 3.55's and 17" wheels? What would I be seeing with a tune? I have 900 miles on it and it runs good and I either drive like a grandma or bat**** crazy.
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post #4 of 14 Old 08-23-2010, 05:54 PM
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Another question. I have sync and it's supposed to send feedback to ford about vehicle health. Will that be sending back data showing an aftermarket PCM flash?
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post #5 of 14 Old 08-23-2010, 08:33 PM
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the SCT programs only say their tunes will boost mpg by 1-2. so not seeing much of an increase in town isnt really surprising. like said above, these trucks are heavy so its hard to see a ton of improvement in town.

-Mike

2005 F-250 Lariat

Quote:
Originally Posted by azkcr View Post
And you didn't know Cummins can manage 127mpg??? They also deliver babies, go to Mars, and cure AIDS. DUH
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post #6 of 14 Old 08-23-2010, 08:49 PM
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I'd suggest trying a custom tune out. The standard SCT tunes run decent but I don't believe they turn off the EGR. A custom tune from someone like DP Tuner or Innovative Diesel for that SCT should give you some results you'll be happier with.

2002 LB7 Duramax
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post #7 of 14 Old 08-23-2010, 09:51 PM
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I didn't realize that Jody had tunes for the 6.4 Jacob. That is interesting news.

Jeff Dodd
spartan_jeff12@yahoo.com

2012 Ford F-250 Lariat CC/SB

Mods - Spartan tuned via laptop, 4" AFE stainless exhaust system, 2.5" PMF BMC leveling spacers, 3" PMF lift blocks, Fox Racing 2.0 shocks, Recon smoked mirror & cab lights
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post #8 of 14 Old 08-23-2010, 10:31 PM
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We've installed his tunes in quite a few customers truck running the standard SCT stuff, they run pretty damn good, though about running it in my personal truck.

2002 LB7 Duramax
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post #9 of 14 Old 08-23-2010, 10:41 PM
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We've installed his tunes in quite a few customers truck running the standard SCT stuff, they run pretty damn good, though about running it in my personal truck.
That is awesome. Good work Jody!

Jeff Dodd
spartan_jeff12@yahoo.com

2012 Ford F-250 Lariat CC/SB

Mods - Spartan tuned via laptop, 4" AFE stainless exhaust system, 2.5" PMF BMC leveling spacers, 3" PMF lift blocks, Fox Racing 2.0 shocks, Recon smoked mirror & cab lights
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post #10 of 14 Old 08-23-2010, 10:45 PM
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I don't think it's 550hp tuning, but for the average 6.4L owner with daily driving and towing needs, it seems to work great.

2002 LB7 Duramax
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