This also could include all diesel motors with the 2010 emissions. Has anyone made any modifications to their exhaust systems. I am considering doing a DPF delete, going to 4 inch piping, keeping the cat. converter and muffler.
Mmalenski said
06:06 AM Dec 27, 2010
Yes I have added a bigger exhaust pipe (6inches). And open up the intake (k and N intake) this has added about 3-4 miles to a gallon. I have also used a chip to help. What a difference! I have a 2006 ford 350 dully
Racerguy said
07:31 AM Dec 27, 2010
I did mods to my last Diesel truck and never gained enough in fuel milage to pay for the mods.My 6.7 Dodge is stock and will stay that way.I have plenty of power.Sounds strange coming from someone with a screen name like mineThink what it's going to cost when big brother starts inspecting them and you have to put them back to stock. It's coming!!Some people worry about warranty issues but that is not an issue in my book as most modified trucks are out of warranty already.I am dissapointed in fuel milage with my truck but will just live with it. Just my opinion.
2fortheroad said
02:29 PM Dec 27, 2010
Racerguy wrote:
I did mods to my last Diesel truck and never gained enough in fuel milage to pay for the mods.My 6.7 Dodge is stock and will stay that way.I have plenty of power.Sounds strange coming from someone with a screen name like mineThink what it's going to cost when big brother starts inspecting them and you have to put them back to stock. It's coming!!Some people worry about warranty issues but that is not an issue in my book as most modified trucks are out of warranty already.I am dissapointed in fuel milage with my truck but will just live with it. Just my opinion.
I'm with you George, the 6.7 has plenty of power. It would be easy to do damage too the drive-train if you were to abuse the touque. As you, I am dissipointed in the mpg and in my opinion we will be seeing $4.00 + a gallon again.
Dr Gonzo said
11:49 PM Feb 1, 2011
Hey George and Ron - you both sound somewhat disappointed in your mileage. What are you getting towing? not towing? I have a 2004.5 Dodge 3500 with a 4:10 rear end and get 10-12 mpg towing (depends greatly on speed - 59 mph seems to be my sweet spot - and terrain) and 18-20 mpg not towing. I tow a comparable rig to your guy's, especially close to yours Ron a 2008 Designer 36 RLTS. The only aftermarket I added was a Pacbrake exhaust brake; something I am so glad I did - no "white knuckling" the Grapevine any more! The power has always been there to tow and now I have the security for severe downhill grades. I to woiud not "chip" my vehicle and if for some reason I change my mind I would up grade my transmission first.
Racerguy said
08:42 AM Feb 2, 2011
I'm not as much disappointed in my towing mileage as I am in my empty mileage. Towing I found 61 to 62 mph is best and depending on terrain I average right at 10 mpg.Empty around town with an occasional short highway trip I only get 13 to 14 mpg. My 01 5.9 got about the same towing but would get close to 18 to 20 empty.A lot has to do with the emissions equipment they started using in 08 with the 6.7. I absolutely Love the truck despite the fuel mileage.You can't beat the 6 speed automatic with tow-haul combined with the factory exhaust brake. Mountain driving is a pleasure.Gonzo,I would keep that truck,according to a Diesel forum I go to once in a while the 04 to 06 is the most popular over all.
Bill and Linda said
09:24 AM Feb 2, 2011
Well, here we go with the modification and MPG discussion.Good, it’s fun.
I have a 2006, DRW, Crewcab 3500 Chevy, Duramax / Allison.So far, absolutely no engine, transmission or other vehicle issues; and the diesel is really quite according the DW who is the arbiter of such evaluations.
I did put in a 4” Cat-back exhaust as recommended by my dealer’s “top” mechanic.Other than that, mine’s stock.I have the very last run of Duramax before the DPF addition and it will burn “regular” diesel.I purchased it for just that reason so I never had to worry about Ultra-Low diesel.“No “chip” at this time, the truck hasn’t needed it.
I have lots of power and the 5’er is 17,200 lbs and that is on a CAT scale and also has been weighted on individual wheel scales.I would like a turbo brake and considered it, but the Allison transmission is so good that I really didn’t need it even on the 7-10% grades going up (and down) the Alcan.There are two or more aftermarket turbo brakes available in addition to traditional exhaust brakes.IMO, turbo brakes do a better job, but that’s just my 10 cents.It depends on the drive train combination.With an Allison integrated to the turbo that’s a better deal according to some tests then the exhaust version.The turbo brakes also don’t require any welding, etc.It’s just software. But I digress as usual.
This truck solo is quite heavy with the extra fuel tank, bigger hitch and a big box of tools and spares.That said, I get between 10.5 and 11.5 MPG towing – depending.Going from NC to Florida and back I averaged 11.2 MPG.Solo, 16.8 – 17.5.It all depends on speed.The sweet spot is 61ish where the RPM’s are 1,600 and in double overdrive (6th gear.)Yes, in Tow Haul the Allison will go into 6th, and stay there, even with the 3.73 rear end which is all GM offers with the 3500 Duramax and all it needs to do the job.
I haven’t “chipped” the engine. I’m not afraid to as such, just did want to take the chance on a warranty issue when on the road and away from my home dealer.That to me was the main determining factor in “no chip.”After I pass 100,000 miles, I might reconsider it to get a turbo brake and more engine control, but I doubt it. Honestly, the truck doesn't need it. Safe travels
Has anyone made any modifications to their exhaust systems. I am considering doing a DPF delete, going to 4 inch piping, keeping the cat. converter and muffler.
Well, here we go with the modification and MPG discussion. Good, it’s fun.
I have a 2006, DRW, Crewcab 3500 Chevy, Duramax / Allison. So far, absolutely no engine, transmission or other vehicle issues; and the diesel is really quite according the DW who is the arbiter of such evaluations.
I did put in a 4” Cat-back exhaust as recommended by my dealer’s “top” mechanic. Other than that, mine’s stock. I have the very last run of Duramax before the DPF addition and it will burn “regular” diesel. I purchased it for just that reason so I never had to worry about Ultra-Low diesel. “No “chip” at this time, the truck hasn’t needed it.
I have lots of power and the 5’er is 17,200 lbs and that is on a CAT scale and also has been weighted on individual wheel scales. I would like a turbo brake and considered it, but the Allison transmission is so good that I really didn’t need it even on the 7-10% grades going up (and down) the Alcan. There are two or more aftermarket turbo brakes available in addition to traditional exhaust brakes. IMO, turbo brakes do a better job, but that’s just my 10 cents. It depends on the drive train combination. With an Allison integrated to the turbo that’s a better deal according to some tests then the exhaust version. The turbo brakes also don’t require any welding, etc. It’s just software. But I digress as usual.
This truck solo is quite heavy with the extra fuel tank, bigger hitch and a big box of tools and spares.That said, I get between 10.5 and 11.5 MPG towing – depending. Going from NC to Florida and back I averaged 11.2 MPG. Solo, 16.8 – 17.5. It all depends on speed. The sweet spot is 61ish where the RPM’s are 1,600 and in double overdrive (6th gear.) Yes, in Tow Haul the Allison will go into 6th, and stay there, even with the 3.73 rear end which is all GM offers with the 3500 Duramax and all it needs to do the job.
I haven’t “chipped” the engine. I’m not afraid to as such, just did want to take the chance on a warranty issue when on the road and away from my home dealer. That to me was the main determining factor in “no chip.” After I pass 100,000 miles, I might reconsider it to get a turbo brake and more engine control, but I doubt it. Honestly, the truck doesn't need it.
Safe travels
Bill