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Old March 7th, 2009, 06:52 AM   #1
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Default 6.7 diesel good or bad

Is the new 6.7 motor better than the 24 valve 5.9. I heard they had some problems with it throwing some check engine codes and going into limp mode? yes I know they make huge power.love my 99 5.9, does the 6.7 get the same kind of mileage?
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Old March 7th, 2009, 06:55 AM   #2
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Since the 5.9 is a super reliable workhorse I would assume Cummins would be just like other manufacturers and fukc up a really great product when they modify it.
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Old March 7th, 2009, 07:44 AM   #3
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None of the newer diesels get anywhere near the kind of mileage the older (pre 07) diesels get, thanks to the new diesel particulate filters all of the big three have added to comply with newer emission laws. The dpf collects excess soot before it can make it out the exhaust pipe. But when the filters begin to clog up, the ECU demands the engine to produce higher exhaust temps to clean out the filter, which is achieved by burning more fuel. I have yet to see a newer diesel get much better than 12 or 13 mpg, which is sad considering I can get 16+ mpg with my '99 7.3 on 44 boggers. And yes, the 6.7 does make huge power stock, but if really love your 5.9, I would highly suggest keeping it. Plus with a few mods you could easily pump out the same kind of power with your 5.9.
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Old March 10th, 2009, 02:53 PM   #4
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i know a couple of guys with 6.7 that pull car trailers and they got rid of all the
dpf and took the computer apart and added resistors to fool the computer and they
are getting 12-14 mpg fully loaded (three car trailer) when bobtailing they are
getting mid 20s on the interstate. plus the power is incredible when all the emmisions
equipment is off. rode in one of the rigs and in crazy larry u can break the tires loose at
70 mph mind u this was a dually.
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Old March 14th, 2009, 10:41 PM   #5
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Default 6.7 diesel

There were some growing pains with early 6.7L. Cummins has new software and revised parts available to resolve DPF and VGT Turbo issues of the past. Yeah its true the 6.7 will never get the fuel economy of a 5.9l. Emissions regulations have finally caught up. In stock form a 6.7L will keep up with a lightly modified 5.9l. .
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Old March 28th, 2009, 06:44 PM   #6
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my brother in law has an 08 2500 qc 4x4 completely stock and gets 20-21 mpg on summer fuel and about 16-17 on winter fuel. I've heard of alot of the 6.7's gettin farely decent mileage like that but the fords and chevys arent gettin that good. His truck also has tons of power stock but not at all sayin its better then the 5.9. i know guys with 5.9's that are gettin 22-24 mpg all day long and still have tons of power. but i also believe that a 6.7 with a straight pipe, cold air intake, and a decent programmer will pull down 23 mpg. just my .02 cents though.
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Old March 28th, 2009, 07:05 PM   #7
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get rid of the egr and dpf and its way better then the 5.9l and same mpgs.
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Old March 28th, 2009, 07:07 PM   #8
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Quote:
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i rode in one of the rigs and in crazy larry u can break the tires loose at
70 mph mind u this was a dually.
im gonna call bs
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Old March 29th, 2009, 10:47 AM   #9
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i second that 07white59.
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Old April 1st, 2009, 07:53 AM   #10
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i know guys with 5.9's that are gettin 22-24 mpg all day long and still have tons of power.
Speaking of bullshit...
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Old April 1st, 2009, 06:00 PM   #11
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bullshit??? my buddy had on 04 cummins with an edge w/ attitude stacked with a smarty and a bully dog programmer (forget which one) along with a garret bb turbo injectors and fass fuel. and an hts full billet trans and billet convertor. i would say a decent amount of power comin to the wheels wouldnt you? and he got 22.5-23 mpg's driving down to indy last summer. so dont talk shit when you dont know what im talkin about even.
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Old April 1st, 2009, 07:38 PM   #12
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my 99 was getting 22 mpg with 280,000 miles on it until the block cracked. went to wyoming, new mexico and back pulling about 11,000 lbs and averaged 14 mpg last month. I just got an 02 to transplant in hopefully by the weekend it will be running.
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Old April 1st, 2009, 07:46 PM   #13
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my 99 was getting 22 mpg with 280,000 miles on it until the block cracked. went to wyoming, new mexico and back pulling about 11,000 lbs and averaged 14 mpg last month. I just got an 02 to transplant in hopefully by the weekend it will be running.
i bet you had the 53 block
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Old April 1st, 2009, 07:49 PM   #14
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I have yet to hear good about the 6.7 or for that matter any new diesel but a buddy of mine has a 5.9 in an 01 2500 with a manual and he got 20mpg hauling a goose neck with another ram on it at 80 all the way across the state. He's got 5inch exhaust and FASS stuff.
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Old April 1st, 2009, 07:52 PM   #15
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the new 6.7l are torque monsters
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Old April 1st, 2009, 07:57 PM   #16
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My 05 5.9 gets 35 mpg towing a 25K goose at 100 mph.
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Old April 1st, 2009, 08:00 PM   #17
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i bet you had the 53 block
yup sure did. hope the 02 lasts as long(at least its not a 53 block)
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Old April 2nd, 2009, 01:58 PM   #18
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Quote:
Originally Posted by mprmn08 View Post
bullshit??? my buddy had on 04 cummins with an edge w/ attitude stacked with a smarty and a bully dog programmer (forget which one) along with a garret bb turbo injectors and fass fuel. and an hts full billet trans and billet convertor. i would say a decent amount of power comin to the wheels wouldnt you? and he got 22.5-23 mpg's driving down to indy last summer. so dont talk shit when you dont know what im talkin about even.
Don't get your manties in a twist there Einstein. You posted: "i know guys with 5.9's that are gettin 22-24 mpg all day long". That says nothing about some guy with $15,000+ invested in aftermarket parts and indicates you know of more than one 3rd gen Dodge getting 22-24 mpg all day long. I hate to break it to you, but un-modified 3rd gen's will NOT get 22-24 mpg "all day long". I've been driving a 2004.5 3500 for 5 years with 130,000 miles on it. Even with an Edge EZ, an aftermarket exhaust manifold, air intake/torque tube, 5" exhaust, and driving like a grandpa with a full cap on the back will only get me 19 on the highway, running 70 mph or less. I've researched a ton on how to improve the mileage on 3rd gen trucks. Yes, you can improve them and you might hit 22+ with $15,000 or more in parts. Beyond that, anyone that claims anything over 20mpg in a 3rd gen Dodge (2004.5 and later) "all day long" is either lying or not calculating the mileage correctly.
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