GM's 2017 New Duramax Turbo-Diesel Most Powerful to Date

GM Duramax 1

The next-generation turbo-diesel 6.6-liter Duramax engine, set to debut in the 2017 Chevrolet Silverado heavy-duty and GMC Sierra heavy-duty pickup trucks, will offer more torque, power and fewer emissions than ever before. GM debuted the engine at the 2016 State Fair of Texas.

Rated at 445 horsepower at 2,850 rpm and 910 pounds-feet of torque at 1,600 rpm, the new engine is essentially all new. GM engineers have touched just about every piece of the V-8 engine from tip to tail to make it stronger and more efficient. Yes, it is still the same displacement and it still offers a 32-valve setup, but other than that, every aspect of this new engine is new and upgraded.

The more powerful Duramax (with 19 percent more torque and 12 percent more hp) has a new, stronger cast-iron block able to house a larger-diameter crankshaft with stronger connecting rods and cast-aluminum pistons. The aluminum cylinder heads now incorporate intake and exhaust passages, is stiffer, and provides much better cooling.

Regarding the injection system, it uses smarter and more sophisticated high-pressure (capable of 29,000 pounds per square inch) fuel injectors that provide as many as seven separate fuel-delivery events per combustion event to make it quieter, more powerful and less likely to exhaust unburned fuel.

Possibly making the biggest impact to this Duramax is the new and larger, electronically controlled variable-vane turbocharger, which also provides greater performance for the exhaust brake system. On the emissions side, there are now three separate catalysts to reduce emissions, the first attached to the back end of the turbocharger; out-the-tailpipe emissions are reduced by 35 percent.

The new, higher-output engine will still be mated to the Allison 1000 transmission (originally born from the medium-duty truck segment), but it now has a stronger torque converter with several heavier-duty dampers, uses a stronger output yoke and provides faster lockup during heavy-load situations.

It's also worth noting how special the new intake hood design is to this powertrain. Because intake and exhaust temperatures are so important to diesel engines, GM designed its own hood/intake system, which allows the truck to get more and cooler air into the engine. The vented hood provides as much as 55 percent of the air going into the engine, yet is also able to separate and condense any water or dust particles that get sucked in, dumping its contents into the engine compartment before it ever gets close to the filter. As the air snakes through the hood, it cools. Then, along with the air intake mounted in the traditional spot (in the grille next to the passenger headlight), air passes through the heavy-duty filter before it's sucked into the diesel combustion chamber.

We had the chance to do some "light" towing with a few Silverado 3500 dually 4x4s while pulling a well-balanced 10,000-pound box trailer behind. We found the new powertrain a significant improvement from the previous generation in how responsive and powerful the new setup is off the line and when rolling from 40 to 70 mph. (We may or may not have spun a few dually tires during our drive.) The overall feel is stronger and more confident, but we still have a few gripes.

Unfortunately, even with modifications to the transmission, GM engineers still do not allow the driver to see what gear the transmission is in unless you pull it down into the manual setting. Also, the exhaust brake (still) only offers an on and off setting, and didn't seem to provide much impact with the trailer on hand (though we did notice some strong grade braking). Finally, although the diesel exhaust fluid tank is a little larger, providing longer filling distances, the tiny fill cap is still inside the engine compartment with an inconveniently small filler hole, almost guaranteeing a messy operation for customers.

The new diesel engine and transmission upgrades put the GM HD players (in terms of torque) just underneath the new 6.7-liter Ford Super Duty Power Stroke, which offers 440 hp and 925 pounds-feet of torque, and just above the 6.7-liter Ram Cummins, which offers 385 hp and 900 pounds-feet of torque. Like Ford, GM will have only one power rating for its engine combination regardless of model configuration.

The new powertrain will be available on 2017 Silverado and Sierra HDs in the first quarter of 2017, and pricing will be slightly more expensive than the current-generation diesel option. Although nothing official has been released yet, the new powertrain will likely cost around $9,000. More details to come.

Cars.com photos by Angela Conners; manufacturer images

 

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2017 Chevy Silverado HD DMax II

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Comments

"Possibly making the biggest impact to this Duramax is the new and larger, electronically controlled variable-vein turbocharger"

*vane, not vein

Vanes refer to the mechanical devices associated with turbines, windmills, etc.

Veins refer to the blood vessels within mammals and other animals that typically carry de-oxygenated blood back to the heart.

Nice. Those big HD's from Ford, Dodge and GM are getting so expensive a guy needs to win the lotto two times now to afford one.

Another 15 years of performance dominance!!

Another 15 years of performance dominance!!


Posted by: Madmax | Sep 29, 2016 11:16:34 AM

Nuff said !

again GM falls just short of Ford, i wonder if they couldnt match the TRQ becasue of the duramax or the allison? Why would you do that? I can see the commercial now.....we at GM are have now bested Ford in the HP category but still fall short in the TRQ category, but hey we are getting close.....kinda like the stupid Sprint commericals about everyones pretty close and we are just short of perfect like verizon, hahaha

Thank you Ford, for inspiring the competition!

It does not matter what the numbers say GM will keep outperforming Ford and Dodge as they have done in the past with less paper power

Yeah but a guy needs something to spend his hard earned lottery won money

It does not matter what GM does, Ford and Ram will keep outselling GM as they have done in the past. GM sucks at making HD trucks.

All of this new tech is cool and the numbers are impressive, from the looks of it, it seems that the 6.6/6.7 liter diesel engines are limited to a max power out put around 445 Hp and 925 ft lbs of torque. It's kind of interesting that all of the big 3 are introducing updated diesel engines around the same time, I hear Cummin's has an update B-series engine for 2017.... I guess it' be a '18 model year update.

The problem now is, like other have said in previous posts, they are getting so expensive these days you have to be rich to buy one plus from what I heard from service writers at a Chevy and RAM dealership is that the re-gen exhaust system has ruined the diesels, they cause too many problems for those who drive short distances and don't work their engines. It'll be interesting if they can find a fix for that in the near future.

Taken as a whole, there is nothing here to make the ground move. Ford engineers at Dearborn will not be too worried. Better luck next time GM.

We'll just have to see when putc does there next hd shootout
Prediction GM Duramax wins just like the last 15 years of shootouts. You won't find any other winner on this site.

Don't even need to see a shootout to know the Duramax puts the power to the ground...and the Frods are just paper champions

again GM falls just short of Ford, i wonder if they couldnt match the TRQ becasue of the duramax or the allison? Why would you do that? I can see the commercial now.....we at GM are have now bested Ford in the HP category but still fall short in the TRQ category, but hey we are getting close.....kinda like the stupid Sprint commericals about everyones pretty close and we are just short of perfect like verizon, hahaha

Posted by: Nitro | Sep 29, 2016 12:32:37 PM

Because of the 6.6L base engine design it is easier to make more HP but more difficult to make torque. Yes you put enough fuel and atmosphere into the cylinders it will make torque but engine designs like the Ford 6.7L and Cummins 6.7L is easier to get great torque. The Cummins is limited on its ability to make good HP numbers and the Ford 6.7L can do much better with making HP but the 6.6L is the better design for HP but not as good making torque.


It does not matter what GM does, Ford and Ram will keep outselling GM as they have done in the past. GM sucks at making HD trucks.

Posted by: Paul | Sep 29, 2016 2:09:40 PM


That right there proves that having the most powerful truck doesn't equate to the most sales.

It does not matter what GM does, Ford and Ram will keep outselling GM as they have done in the past. GM sucks at making HD trucks.

Posted by: Paul | Sep 29, 2016 2:09:40 PM
/QUOTE

That only proves Frods and Fiats are not as reliable as CHEVYS so they trade them in before warranty expires

Glad to explain facts of life to ya,kido

HAHAHA
https://youtu.be/TZg9f9a1ip8

According to GMauthority.com, Gale Banks has been working in conjunction with GM engineers for military applications, and he says there is a lot of room for higher power levels in the future. I'm not worried about GM "keeping up". I'm sure they thoroughly tested this powertrain against the very latest from Ford and Ram and made sure they had a margin for what they figured the competition would do in the near future.

Just remember, the last shootout the Duramax, got as much as 22 percent better FE then the SD, GM puts the power to the ground and gets the FE, lets see how the Alum SD does, it might have caught up to the old Duramax in that regard, the new Duramax is sure to improve upon FE as well as Power.

To the nubie's that think this is all you can get out of the diesels, you are clueless, all three, Cummins, Duramax, Ford can be programmed WAY above the stock numbers, how long the engines and trannys last, that's the price you pay, for playing!

It puts more power to the ground because it has a weaker transmission. Anybody who says the allison 1000 is bulletproof knows nothing about transmissions. I personally know people who had them replaced. Mechanic says if you overheat one it's toast. Also I believe the Ford 6.7 block is CGI, capable of much more power. Article says GM still using cast iron, would have thought they might have caught up by now.

It will be interesting to see what GM publishes as the high speed limit for this engine. The LMM was 3200 RPM, the LML was 3000 RPM, if the L5P is rated at 3000 RPM then the power output should be some where around 455 to 465 HP with the slope of the torque curve. This provides a little "headroom" beyond the 2850 RPM power output as published.

THIS IS WHAT 925 FT-LBS can do in a 2017 Super Duty:

BURNOUT-

https://www.youtube.com/watch?v=KKXI56UoRIk

2017 SUPER DUTY 0-60 MPH TEST:

https://www.youtube.com/watch?v=-o4eEBzrSAQ

I've been in the automotive business for 20 years next month. I mostly sold Ram's (Dodge) during that time. I did enjoy selling the Cummings Diesel, note it's not made by Dodge. Also, I used the word "sold" because you had to sell a Dodge to people because most customer's were weary about their reputation. Mainly in the transmission. I never sold Ford and will never sell Fords. Too many times we would call and get trade numbers on the Ford diesels and even a franchised Ford dealer would not buy them from us because of the problems Ford has with the Diesel engines. I work with Chevrolet now and it's such a delight dealing with a capable engine and transmission. Also the customer never questions the reliability and future value of Chevrolet. Just my 2 cents

At present, there are only two V-diesel engines in the market that are not based on CGI cylinder blocks: the Mercedes 3.0L V6 (aluminium) and the General Motors 6.6L Duramax V8 (grey cast iron). CGI has effectively become the standard material for V-diesel engine cylinder blocks.
GM will come too.

anybody know Ford never have the best puller only the past 2 years now it look like gm will be back on the top but Ford is first for all the gadget this is why people bye a Ford for the gadget not because it's a good puller ,,

How many years until they hit 1000ft/lbs?


How many years until they hit 1000ft/lbs?

Posted by: Woopud | Sep 30, 2016 3:10:20 PM

I really thought we would be almost there by now. We will see what fiat does with Cummins blessing and see who makes the first jump.

A lot of great pictures and info here

http://www.tfltruck.com/2016/09/2017-chevy-silverado-hd-new-6-6l-duramax-first-driving-impressions-video/

The torque reading really doesn't mean crap and shouldn't be allowed to be advertised for either brand. Neither one of the three companies can achieve what is advertised. Try your hardest to hit full boost by 1600 rpm in your duramax. Other than first gear that will be the only time you can be wide open at 1600 rpm because in any gear higher than that it will downshift. All three companies do this and all 3 also have torque management in first gear and also none have a fast enough spool time to hit peak boost and full fueling by 1600rpm in first gear. The hp has shown to be the king in all the tests because towing heavy in these trucks happens all above 2000rpm and the Duramax and Ford both shine there. The Cummins is a nice motor, but doesn't rev well in comparison which is why they don't shine in these tests and to top it off the high power version isn't in all of them vs the Ford and GM having only one power version. All three make nice trucks. Anyone would be lucky to have any of them. I would preferr the GM, but all three would be great.

@Zippy
These transmission are electronically controlled.
So you can use what is called the "ManuMatic" interface.
That means you control the gear, so you can 'floor' it, and NOT have the transmission donwshift.
With 3.73 ring/pinion & 265/70 18 tires:
1600rpm in 6th gear: 66mph. 5th: 57mph. 4th: 40mph. 3rd: 29mph. 2nd: 22mph.

I like the Cummins, but to say, just above the Cummins with 60 more HP and 10lb feet of torque is a bit of a stretch, thats a big just above.

When the SD was 440HP it had alot more HP and TQ than the Duramax but got way worse FE and the Duramax pretty much beat them both, now on a diet the SD and Duramax should battle well.

Great Job Isuzu!!!

Great Job Isuzu!!!
Posted by: Chris | Oct 2, 2016 12:51:59 PM

I agree!

Isuzu has been building some of the most tough and relaible engines since 1916. Their engineering team is why the Duramax has been reigning supreme over the Powerstroke since 2001. Nice to see the Duramax engine plant in Moraine, Ohio build such tough, reliable diesel engines. Even the block and heads castings made in Defiance, Ohio.

On a side note, it's a real shame that Ford finally made a decent Powerstoke (6.7) after the disastrous 6.0 and 6.4, and they end up building them all in Mexico.

That all black truck is sweet. Is that a package?

Ron, I think that will be the All Terrain package similar to what the rest on the Chevy lines do, although I didn't see a comment about it being on the HDs yet.

The one thing (And very noticeable!) is the fact that these numbers are SAE CIRTFIED!
I don't know if the Cummins is or not, but the Powerstroke is NOT SAE CERTIFIED!

This tells me that Ford is saying trust us when we publish the numbers, no need to get a second test!

Competition is a great thing. Its remarkable to me how powerful and fuel efficient are these modern diesel engines compared to similar offerings just 15 years ago: twice the power, twice the torque with equal to or better fuel economy. All while emitting far fewer pollutants. Engineering at its finest!

Its a shame they're so pricey...

And for the record, my 6.4 has been nothing short of rock solid and gets respectable economy as a daily driver and farm truck (16-17mpg). Of course, its been deleted and (mildly) tuned since day 1 :D

900 + Lbs now i dont see the need to have other than bragging rights when at best most trucks are only using 40% of it at best while doing towing i think GM has done well but more so due to the Allison Being the Smartest trans in a pickup to manage that power

Funny how Ford commercials are claiming to have more HP than any other HD truck even after GM has a SAE certified engine producing 445 HP versus Ford's 440. I guess they only have a few more months to claim that and they're comparing their 2017 model to GM's 2016 model. Typical Ford marketing. I guarantee you that GM's Diesel will once again blow away both Ford and Ram in any kind of comparison or shoot out testing, once again.

And after years of Ford fan girls pointing out that GM's trucks expose their frames, Ford's HD's now have the exact same look as GM's. How's that taste, beyotches? LOL!!

The GM trucks were already hands down the best in the class EXCEPT for power output. The previous gen Ford Super Duty was a DISTANT third .

In most tests the GM trucks handily won the comparison tests .

Now the GM essentially matches the Fords output .

Is the new Super Duty a better chassis etc.? Bring on the comparison test......The Ram is now decidedly in the #3 spot until the new models appear a year or two down the road.

I have seen several of the new Super Duty trucks around town , nice but VERY square and honestly dont really have standout looks any longer. I read somewhere they share cabs with the F150 now? Hmmm.....interesting

Should be interesting.....The new Ford should come out on top being ALL new but it will be a fight , the GM trucks are/were quite good and now are just as powerful as the Fords.

The GM trucks were already hands down the best in the class EXCEPT for power output. The previous gen Ford Super Duty was a DISTANT third .

In most tests the GM trucks handily won the comparison tests .

Now the GM essentially matches the Fords output .

Is the new Super Duty a better chassis etc.? Bring on the comparison test......The Ram is now decidedly in the #3 spot until the new models appear a year or two down the road.

I have seen several of the new Super Duty trucks around town , nice but VERY square and honestly dont really have standout looks any longer. I read somewhere they share cabs with the F150 now? Hmmm.....interesting

Should be interesting.....The new Ford should come out on top being ALL new but it will be a fight , the GM trucks are/were quite good and now are just as powerful as the Fords.

When you look at these trucks their frame and cross members just hang down. Not too mention the Tank hanging down and cross-members - Terrible design. the ground clearance has to be terrible. If you don't have the nurf bars these trucks look hideous! My tax dollars 'wasted' on the GMC - General Motors Crap!

I am not a Dodge fan but they are much better than the GM stuff..

Just read this on the net:
That Fiat Chrysler 29% gain from September of last year meant that FCA sold 47,792 full-size Ram pickups last month. That's enough that the Ram was able to outpace General Motors' (NYSE: GM) Chevrolet Silverado (45,380 sold).

We should have let GMC tank!

not a real truck too many doors

I have had a few diesels. Really only liked the GMC. It sounded like a real diesel and it got the highest fuel economy.I actually got 24.7 mpg. The Cummings got the poorest mpg, About 17.9 . Truly did like the cummings, but it sounded like a six cylinder engine. I am going to lease a new RAM, but not a diesel, Going to get the V6 engine. No other truck maker has a six cylinderr engine this strong. Plus it is not extra cost. It is the standard engine. Why a RAM ?, I like the truck, like the dealership. TATE in Glen Burnie MD. I will be driving again, wonderful.

Responses on jack. We should have let GM sink but yo are ok with Dodge? Both GM and Chrysler took money from the government but only one of them is still an American owned company. So it's ok to give money to Fiat but not GM.

Can't believe diesel truck guys mispell Cummins by spelling it Cummings. Drives me crazy!!



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