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Old May 1st, 2008, 08:28 AM   #1
barry1me
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2008 Superduty 6.4L......BAD AZZ

I have been contemplating the idea for a long time about getting a new 6.4L. I want to hear from some of you that have one. Some of the aftermarket tuners are making some huge HP out of them 608RWHP.....1200Ft/lb of torque by just tuning and removing dpf
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Old May 1st, 2008, 08:52 AM   #2
comanche38
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I purchased one for my work and it is a great truck, however we had it in the shop all ready because of a "hiccup" during idle, but that is fixed. We will not make any performance mods but it is a strong runner.
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Old May 1st, 2008, 09:12 AM   #3
Bones
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I'm running a bone stock 08 crew cab dually around for work, with a total vehicle weight of just over 12,000 lbs (weight box and bead bags in the bed). Drove to Flint and back last night and got 14 mpg with a regen in the middle. Not great, but not terrible. It rides like a caddy though... handles the weight llike nothing.
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Old May 1st, 2008, 10:43 AM   #4
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Im the comercial truck manager at Suburban ford in Waterford. I can hook you up with one, if you decide to buy let me know!

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Old May 2nd, 2008, 06:29 AM   #5
88yj
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Quote:
Originally Posted by Bones View Post
I'm running a bone stock 08 crew cab dually around for work, with a total vehicle weight of just over 12,000 lbs (weight box and bead bags in the bed). Drove to Flint and back last night and got 14 mpg with a regen in the middle. Not great, but not terrible. It rides like a caddy though... handles the weight llike nothing.
That is pretty good mpg. I know regen burns a lot of fuel with those trucks.

I towed a waggy through Ohio and got 10.3 mpg with cruise set at 65 mph in tow/haul mode with gentle acceleration. With a Fiero on the trailer coming back the same roads at the same speeds, I got 15.4 mpg.

The 6.4 isn't bad, but if I were ever to buy a new truck I would probably wait for the 4.4-liter diesel to see what kind of mpgs it pulls. My understanding of the new diesel is it will be tuned for mpg, not big power like the 6.4. I don't need a lot of power, my IDI is actually fine, I would like a new truck with IDI-like mileage. I'm afraid that's not possible with the new emissions regs. Not to mention how much all those emissions regs cost.
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Old May 13th, 2008, 11:51 AM   #6
2kids=nojeepmoney
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Quote:
Originally Posted by 88yj View Post
I towed a waggy through Ohio and got 10.3 mpg with cruise set at 65 mph in tow/haul mode with gentle acceleration. With a Fiero on the trailer coming back the same roads at the same speeds, I got 15.4 mpg.
i got 14.5 hauling a waggie on a 3k# trailer back from south carolina through the mountains... at 70-ish. 10.3 seems awful low. but mines a dodge.
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Old May 14th, 2008, 09:19 AM   #7
88yj
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What year is your dodge? The new diesels aren't like the pre 08 trucks. All the new trucks get worse mpg than older trucks. Adding weight and emissions controls never improves fuel economy.
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Old June 15th, 2008, 04:47 PM   #8
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Quote:
Originally Posted by 2kids=nojeepmoney View Post
i got 14.5 hauling a waggie on a 3k# trailer back from south carolina through the mountains... at 70-ish. 10.3 seems awful low. but mines a dodge.
yes it does, I got around 11 in our 06 with some city driving and 75ish on the hway with tow/haul on

Im thinkin about using our f-150 from now on with diesel being so damn expensive
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Old June 15th, 2008, 09:17 PM   #9
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i think my new 6.4 will walk a 6.0, very nice interior, feels strong. i havent really worked it yet....only have 450 miles on it ( but i love it, other than the milage)
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Old May 19th, 2009, 09:00 PM   #10
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The new 6.4's are great engines. I have had mine since Feb of 07 and haven't had a single issue. I have the Spartan tuner, 4" exhaust from the downpipe back, and CAI. These trucks are capable of 600+ HP and over 1,100 lb/torque with minimal mods. After this it runs out of fuel and air. I would get another in a heartbeat, tuned they are a blast to drive.
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