2500HD with 6.6 gas

[Hclarkx]

Here's the image referenced above. It looks to me like peak torque is 24.3% higher, not the 22% indicated in the video by the GM guy. Moreover, down around 2250 RPM it looks like a 40% increase in torque (from about 300 ft-lb to 420 ft-lb). That's a lot more than the "20% or more" indicated by the GM guy. But, horsepower at that same RPM is only up from about 215 to 275, less than 30%. Since power is torque times speed, these torque and horsepower numbers should match. I'm starting to wonder about this image ...

Then the torque scale has typos above 400 ft-lbs.

[mopwr4me2003]

Originally Posted by Hclarkx

Here's the image referenced above. It looks to me like peak torque is 24.3% higher, not the 22% indicated in the video by the GM guy. Moreover, down around 2250 RPM it looks like a 40% increase in torque (from about 300 ft-lb to 420 ft-lb). That's a lot more than the "20% or more" indicated by the GM guy. But, horsepower at that same RPM is only up from about 215 to 275, less than 30%. Since power is torque times speed, these torque and horsepower numbers should match. I'm starting to wonder about this image ...

Then the torque scale has typos above 400 ft-lbs.



Attachment 215641

Well in GMs eyes it’s better to be under your numbers than over. I was a tech at Hyundai for a long time and they overrated their HP numbers and it ended up costing them big on every vehicle with the 2.7 V6 engine 🤣. So to have a possibility of more power and torque than advertised seems ok with me [emoji106]

[Mr. Dan]

Originally Posted by Hclarkx

Here's the image referenced above. It looks to me like peak torque is 24.3% higher, not the 22% indicated in the video by the GM guy. Moreover, down around 2250 RPM it looks like a 40% increase in torque (from about 300 ft-lb to 420 ft-lb). That's a lot more than the "20% or more" indicated by the GM guy. But, horsepower at that same RPM is only up from about 215 to 275, less than 30%. Since power is torque times speed, these torque and horsepower numbers should match. I'm starting to wonder about this image ...

Then the torque scale has typos above 400 ft-lbs.



Attachment 215641

You guys need to cut it out! I'm trying to quit looking at the Build & Price page for the GMC version of this with the 6.6L gas. I was doing pretty well saying to myself "I just don't like the looks of them without body side molding." Kinda stopped looking -- and now here you are fanning the flames!

[Hclarkx]

Originally Posted by mopwr4me2003

Well in GMs eyes it’s better to be under your numbers than over. I was a tech at Hyundai for a long time and they overrated their HP numbers and it ended up costing them big on every vehicle with the 2.7 V6 engine ��. So to have a possibility of more power and torque than advertised seems ok with me [emoji106]

Definitely. But this comparison curve, supposedly generated with an SAE expert present (according to the SAE rule quoted at the top of the curve) gets more puzzling the more I look at it. Power and Torque curves don't cross at 5252 RPM and they always must. And at 1000 RPM the horsepower is the same but the L8T has 50% more torque. All very weird. I know friction losses and peripherals (like the direct-drive fan which both have) affect the results but still ...........

But, yes, if it's even just as advertised, it's very welcome.

[mopwr4me2003]

Originally Posted by Mr. Dan

You guys need to cut it out! I'm trying to quit looking at the Build & Price page for the GMC version of this with the 6.6L gas. I was doing pretty well saying to myself "I just don't like the looks of them without body side molding." Kinda stopped looking -- and now here you are fanning the flames!

Oh stop. All you have to do is go to the dealer and just buy one then your problem of looking at the build & price page is no more [emoji12]

[swave1]

Had a 2012 3500hd SWD 6.0 It got 12 mpg normal driving. 7 mpg pulling 13000# 5th wheel. Engine was so loud pulling up mtns that you could not talk while in the cab. Talked to a friend last week that has a 2020 6.6 and fuel mpg no better. I have a 2016 6.6 Duramax and it's well worth the $$$ I get 12 mpg pulling and 18mpg around town

[privateer]

Originally Posted by swave1

Had a 2012 3500hd SWD 6.0 It got 12 mpg normal driving. 7 mpg pulling 13000# 5th wheel. Engine was so loud pulling up mtns that you could not talk while in the cab. Talked to a friend last week that has a 2020 6.6 and fuel mpg no better. I have a 2016 6.6 Duramax and it's well worth the $$$ I get 12 mpg pulling and 18mpg around town

do a egr delete on your duramax and you will push the around town and interstate to 23+. that is an impressive mileage pickup imo.

[skipatroller]

Originally Posted by linedriver

Has anyone driven the new 2500hd with the 6.6 gas engine? I am thinking of up grading next spring. Not sure I want to spend the extra for a duramax. Towing a 7600 lb Coachmen Freedom Express Liberty.

I went from a 2012 2500hd with a 6 liter gas engine used to tow my 32' Forest river weighted at about 10 to 11K at full capacity had no problem towing but there wasn't much for gas mileage. I recently had the chance to upgrade to a 42' Heartland bighorn, loaded capacity around 14 K, needless to say it was to big for the gas 6 liter, so I shopped around and found grandpas 2015 3500 hd with the 6.6 Duramax, The truck only had 22 K miles on it, spotless for a 4 year old truck, lets put it this way I can run at 75mph if I wanted to all day long and get around 11 mpg, best thing is the tach is only at 1,800 rpm, not even working, single rear wheel, I drive it to work everyday so I didn't want the dualies. So your gamer will tow this with no problem the diesel would tow it like its not even there. Unless you do what I did and found a great deal on a low mileage diesel, you have to ask is the extra 10K worth, other than looking like the he man at the local grocery store.

[Jakieboy]

We have a 2008 Duramax Diesel 2500 and will never go back to a gasser. The ease with which this old truck pulls our new 5-er is remarkable. We have the Allison 6-speed transmission, but I think the new ones come with a 10-speed.

Well worth the investment. You will get your money back when ready to trade-up. We average 13 mpg while towing our 35-foot 5-er, compared to 6.5 mpg while towing a smaller TT with our 7.4 L Ford Chateau Van gasser. That van engine stuck wide open on me while traversing the downhill Cuesta Grade on US 101 near San Luis Obispo, CA. I will never again rely on a gas engine for my towing needs.

[Mad Cow]

Originally Posted by privateer

do a egr delete on your duramax and you will push the around town and interstate to 23+. that is an impressive mileage pickup imo.

Won't happen anymore. All of the major companies doing emission delete tunes are no longer offering their products. EPA finally caught up to them. There might be a moonlight hacker that cracks the ECM and pulls it off, but it will be as underground as booze during Al Capone. The diesel emissions delete days are now behind us. This video explains it best and is current as of Sept 21st.

https://www.youtube.com/watch?v=FYQmfsQ_SIE

[jjrrtt]

Originally Posted by badger5301

Not the same brand but we pull our 10,000 IB fifth wheel with the Ram 6.4 gas. Does a fine job and this opinion is coming from someone that was pulling with a powerstroke earlier this season.

What is your MPG towing and not towing?

[Mad Cow]

Folks like to throw around the "getting your money back" when it comes to diesels.

My 2015 2500HD 6.0 gasser Z71 LT. I just looked it up in the NADA guide, plugged in the options I got on it, and clean retail it shows $33,975. I paid $38K for it brand new and drive off the lot, not including tax. So in 5 years since I bought it, I have lost just over 4 Grand... less than $1000 loss per year I have owned it. Now, I am not sure that any diesel owner can make any better of a claim about holding the value.

This is why I really get a smile when I hear these "you will get your money back" stories when it comes to diesels. The only reason they cost more used is that they cost an arm and a leg brand new. When one factors what the value is now with what they paid for it new, that really tells the story better.

[aceinspp]

I tow with a Ram 6.4 and my trip this year to PA back to Michigan then back to GA average 10.5 towing 9000# V-Lite tt. I have 3:73 gear and drove at steady 62 mph. Later RJD

[MR.M]

Originally Posted by Mad Cow

Folks like to throw around the "getting your money back" when it comes to diesels.

My 2015 2500HD 6.0 gasser Z71 LT. I just looked it up in the NADA guide, plugged in the options I got on it, and clean retail it shows $33,975. I paid $38K for it brand new and drive off the lot, not including tax. So in 5 years since I bought it, I have lost just over 4 Grand... less than $1000 loss per year I have owned it. Now, I am not sure that any diesel owner can make any better of a claim about holding the value.

This is why I really get a smile when I hear these "you will get your money back" stories when it comes to diesels. The only reason they cost more used is that they cost an arm and a leg brand new. When one factors what the value is now with what they paid for it new, that really tells the story better.

Try and sale it for 33 and see how long it takes . can get new for 35,000 and up . you pay more up front for diesel and get more on the back end just because of the diesel . but a 2015 diesel will cost more then a 2015 gasser . it's all relative you don't make or save money for the most part . I've been looking at a new truck and would be happy with the 2019 with the 6.0. double cab lb i've found new for 34500 with all the bell and whistles i would want

[privateer]

Originally Posted by Mad Cow

Won't happen anymore. All of the major companies doing emission delete tunes are no longer offering their products. EPA finally caught up to them. There might be a moonlight hacker that cracks the ECM and pulls it off, but it will be as underground as booze during Al Capone. The diesel emissions delete days are now behind us. This video explains it best and is current as of Sept 21st.

a simple google search finds that you can still purchase delete kits. of course they now say "race use only" or "off-road use only". if you live in a non-emission test location, guess you can still get away with it...

[Mad Cow]

Originally Posted by privateer

a simple google search finds that you can still purchase delete kits. of course they now say "race use only" or "off-road use only". if you live in a non-emission test location, guess you can still get away with it...

That race use only or off road use only was the gimmick to side step things thus far. The EPA is no longer turning an eye to such stuff.

Actually try and make the effort to purchase one. Won't happen. PPDEI is out of the game. Banks is out of the game. Bully Dog is out of the game. And the list goes on and on. The EPA is not allowing for any 2007.5 or newer, the emissions to be deleted anymore. The EPA is not allowing that even for off road or race. The only way one can do non emission off road or race going forward is to build / restore a pre 2007.5 truck chassis and get a pre-emission diesel crate engine and drop in it.

The delete days came to an end in the last month. There will still be power tunes available but they will now have to be emission compliant. That is the where the industry is going now.

[mopwr4me2003]

Why does every gas related thread always turn to diesel? We get it really we do! But when a topic as simple as a certain gas truck comes up that is what is being talked about simple! The new GAS 6.6 still has a lot of work to do to prove itself but I firmly believe this engine will hold up and do what it is designed to do and one of those things is not be compared to a Diesel engine. There is really no comparison between the two, apples to oranges. So bring on the gas engine towing haters [emoji16][emoji16].

[Mad Cow]

Originally Posted by MR.M

Try and sale it for 33 and see how long it takes . can get new for 35,000 and up . you pay more up front for diesel and get more on the back end just because of the diesel . but a 2015 diesel will cost more then a 2015 gasser . it's all relative you don't make or save money for the most part . I've been looking at a new truck and would be happy with the 2019 with the 6.0. double cab lb i've found new for 34500 with all the bell and whistles i would want

True, might not pull off that $33,975 clean retail amount. But the trade in value according to NADA is $30K. So about an $8K loss. That is about a 21% loss in 5 years, so my 2015 2500HD 6.0 gasser still retains almost 80% of its value according to the dealer guide. Again, I am not convinced that any one with the same pickup in a diesel version would get better than 80% for a 5 year old pickup on a dealer trade in compared to what they paid for the pickup brand new. There might be that one anecdotal story of it being the case, but it is not going to be the average. They just think they are getting a lot more back because the price variance between gas and diesel which is an apples to oranges comparison. They pumped out a lot more green to buy the diesel in the first place.

The NADA is the guide for the dealers. That is why I am using data from it and not the Kelly BB stuff.

Oh... I decided to plug in what the trade in value would be for a diesel version of the very same 2015 2500HD LT Z71 that I have a gasser in. While the NADA trade in for mine shows a hair under $30K, the Dmax version of the exact same pickup shows a trade value of $33,600. A $3,600 difference. Try and buy a new Dmax version of the very same gasser pickup for only a $3600 difference. I don't believe that will ever happen even on a good day. So in actuality, the gasser version actually retains more of its value than the diesel version.

Sorry to burst that bubble, but the NADA guide is what dealers go by. Live with it. Of course there will always be that rube who swoons over the mere mention of the word "diesel" that will be stupid enough to pay more than NADA guide for a diesel pickup. Find that idiot and one might actually recoup more of what they paid.

[Hclarkx]

Originally Posted by Mr. Dan

You guys need to cut it out! I'm trying to quit looking at the Build & Price page for the GMC version of this with the 6.6L gas. I was doing pretty well saying to myself "I just don't like the looks of them without body side molding." Kinda stopped looking -- and now here you are fanning the flames!

If you do venture into a dealer (I'd bet on it) here's one thing to know. The price on the trailer pressure/temperature monitoring/alarm option is only $50, a bargain. Moreover, if you don't order this option, or you buy a truck without it, you can't add it later. As near as I can tell, the $50 buys you the four sensors, a receiver under the back bumper, and seemingly hardware/software/firmware upgrades in the infotainment center and the DIC.

Since it would be easy to plug in a receiver, I'd guess it's the infotainment and DIC upgrades that are beyond a dealer's capability and thus are factory install only (i.e., seemingly requires some hardware, not just firmware that a dealer could update.

For $50 this system should be standard!!

If anyone has more info, I'm all ears. I have a 2020 gmc that didn't have this option so it seems I'm stuck without it.

[Missdenise]

We have a 2013 GMC. 6.2 with 3.73 - does the job just fine. I also use this truck as daily driver, mileage fine. Hubby wants to drive the 6.6 but I am quite happy with what we have, no car payment.