5.9 vs 6.7

[5.9Havoc]

I bought my 06 dodge with 5.9 because I was told that the new 6.7 would be comming out and would have more emissions control and would be down tunned as well as would not have as much ability to mod it - basically that the 5.9 was a better motor and to not miss out... Wondering what you guys think???

Will the 6.7 be better when the aftermarket has a chance to catch up???

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06 Big Horn 2500: Bullydog with Outlook, 5" Magna Flow Exhaust, AFE Stage II Air Cleaner

[Diesel_Nuts]

I bought one of the last 5.9L, and I love it. I am glad I didnt get the 6.7L, because there are so many people having problems with them right now. I think it will be a great motor once they get all of the bugs worked out. Maybe in another year or so, that will probably be the motor to have. For now though, I think the 5.9L is the safe bet on a reliable truck with plenty of mods available for it. Just my .02cents

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07 2500 QC (Electric Blue Pearl) 4x4, 5.9L, HTS Trans, Ostrich Seats, 8" Rize Lift, 20's on 37's, Amsoil w/ BMK-11, SMARTY, 5" MBRP, CFM+, AFE Stage 2/Nano Filter, BD Manifold, Quad Commander & Boost Fooler, FTE Rail Cap, Wicked CP3, Airdog 150, Mag Hytec Diff Covers. More to come.... DiPricol FP & RP, Thanks to John @ Holland Court....8" Mitre coming soon, Thanks to Wally @ FTE!!

[Ram3500Dually]

The 6.7 is NOT downtuned, its much faster than the 5.9. My 05 ran a 15.16 @ 89.06 with an Edge, CAI and straight pipe. My 08 ran 15.21 @ 88.79 with nothing but a CAI on it.

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2008 Ram 3500 CTD 6.7/68RE/3:73 LSD
Previous Rams 90 CC Dually, 94 RC LB, 95 CC SB, 98 QC Dually, 00 QC Dually, 01 QC Off Road, 03 QC Dually, 05 QC Dually REAL TRUCKS DON'T HAVE SPARK PLUGS

[5.9Havoc]

Do you know the reason for uping the displacement? I was told by a Dodge salesman as well as other dodge owners that the 6.7 would have more emissions controlling and the motor would be downtuned which made the 5.9 more desireable... which made me think that removing some of that emissions stuff (on the 6.7) and starting out with a motor that was down tuned would mean that it would have more potential in the long run. Just my thoughts at the time... I know I didn't put much stock in what the salesmen said...lol. Sounds like it moves just fine in stock form anyways.

Do you know the HP and TQ specs vs the 5.9 and the new twin turbo powerstroke?

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06 Big Horn 2500: Bullydog with Outlook, 5" Magna Flow Exhaust, AFE Stage II Air Cleaner

[7492]

The 6.7 IS better....

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2007 Megacab 2500 4x4 6.7Liter 68RFE 3.70 limited slip all the air bags . Bone stock and no problems at all . Build date 5-16-07 20 MPG highway easy .. 21.75 best so far..... 1999 Durango 5.9 Liter 3.92's ALL the options.

[simplysmn]

the best way to do this is go out and drive a new 08 with the 6.7 and the 6 sp auto you will love the feel of it . I sure do

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2008 quadcab long bed Patriot Blue 2500 6.7 with 6 sp auto all the bell's and goodies Sold 1985 crewcab longbed 4x4 with 93 running gear

[Al B]

I do wish I had one more gear with my 48RE, but I'm happy with my 5.9. I imagine by this time next year, the 6.7 will have the bugs worked out, and it will be an amazing motor as well, not that it isn't, just that there seems to be problems with some of the motors.

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2K7 5.9 48RE Megacab

[ynots57]

They increased to 6.7 so the engine would operate under less load to better meet emissions. On a 6.7 you get some great stuff... Exhaust recirculated through your intake system. Exhaust = Heat. So much for cool clean air entering your engine. Wait!... Now you get a cooler for your EGR... WooHooo! sorry! but a cooler = more garbage under hood... and theres more! The good ole DPF along with a regeneration cycle. = more garbage. Dont forget to use your low ash oil! Oop's... you didnt stick some 2 cycle oil in your tank did you? The new ULSD is junk without additives. Im sticking with the 5.9.

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05 - 2500, 4x4x6 srw, 48re, aero, cai, other goodies

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Last edited by ynots57 : 10-28-2007 at 12:25 PM. Reason: .

[ynots57]

Note: 6.7's are a good engine, IMHO still better than Ford and Chevy. I'd just rather start with a 5.9 and build trouble free HP from there

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05 - 2500, 4x4x6 srw, 48re, aero, cai, other goodies

[stinnett25]

The 6.7s will be better when they get the bugs out of them. Which i hear they are doing. The 08's, havent heard much problems from them. YET...... We will see.

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06 BIG HORN 4x4 Billet FTE single disk converter and valve body, 5"TBE, S&B Stage II, aFe Blade Runner, II Stage 1, Eliminator, Smarty, Dipricol's
02 QC LB LARIME 47RE 4x4 FASS 150, 150hp stix, Dipricols, Edge Comp, Smarty, and single 7" black powdercoated Miter, coming AEM and some Trans work.

[BigD]

Cubes are cubes. Bigger cubic inch displacement means more horse and more torque. This has been around almost as long as the bible-

BigD

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2007 Ram2500 Laramie Mega Cab 6.7 auto 4X4. N-Fab nerf bars, pre-runner, rear runner 2" level kit, 20's XD795 Hoss - Black. BFG's 305/55/20 Hella 4000 lights. Smoked cab lenses. I'm done with the outside!

[Begle1]

Unless more displacement means a greater torque to horsepower ratio, in conjuction with a lower redline and more engine spool-up difficulty.

Those little turbo 4 guys with no torque and 10,000 RPM got it figured out, if you ask me...

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1990 D-250 Regular Cab: Full power screw; stout TC and A518 w/ manual valve body; ratchet shifter; piston LP; Ramcharger tank; manual off; computer-programmable 40 GPH water/meth fumigation; gauges