Trucks revealed tomorrow, 9-29.

[jj46]

GMC post on FB:

 

See the debut of the next level of GMC Professional Grade. Watch our Facebook Live coverage from the State Fair of Texas tomorrow around 11 am EST.

 

 

[WilliamBos]

Can't wait!

[newdude]

I will be ready...I could care less about the numbers (because they are already out) and the rest of the truck...I want to know 1.) What did they do to that engine to change it (GMInsideNews reported a new turbocharger but that's all the wrote) and 2.) What have they done with Allison...

[KMGZ400]

I will be ready...I could care less about the numbers (because they are already out) and the rest of the truck...I want to know 1.) What did they do to that engine to change it (GMInsideNews reported a new turbocharger but that's all the wrote) and 2.) What have they done with Allison...

And what will be replacing the CP4 too!

[newdude]

http://media.chevrolet.com/media/us/en/chevrolet/home.detail.html/content/Pages/news/us/en/2016/sep/0929-duramax-chevrolet.html

 

“Nearly everything about the Duramax is new, designed to produce more torque at lower rpm and more confidence when trailering or hauling,” said Gary Arvan, chief engineer. “You’ll also notice the refinement improvements the moment you start the engine, and appreciate them as you cruise quietly down the highway — with or without a trailer.”

Additional highlights include:

• New, stronger cylinder block and cylinder heads
• New, stronger rotating and reciprocating assembly
• Increased oil- and coolant-flow capacity
• New EGR system with single cooler and integrated bypass
• New electrically actuated/electronically controlled turbocharging system
• All-new advanced solenoid fuel system
• All-new electronic controls
• New full-length damped steel oil pan that contributes to quietness
• New rocker cover/fuel system acoustical treatments
• B20 bio-diesel compatibility
• SAE-certified 445 net horsepower (332 kW) at 2,800 rpm
• SAE-certified 910 net lb.-ft. of torque (1,234 Nm) at 1,600 rpm

Segment firsts

• Re-melt piston bowl rim
• Venturi Jet Drain Oil Separator
• Closed-loop glow plug temperature control

The Duramax employs a common-rail direct injection fuel system with new high-capability solenoid-type injectors. High fuel pressure of 29,000 psi (2,000 bar) promotes excellent fuel atomization for a cleaner burn that promotes reduced particulate emissions. The new injectors also support up to seven fuel delivery events per combustion event, contributing to lower noise, greater efficiency and lower emissions. Technology advancements enable less-complex solenoid injectors to deliver comparable performance to piezo-type injectors.

 

Electronically controlled, variable-geometry turbocharging system

A new electronically controlled, variable-vane turbocharger advances the Duramax’s legacy of variable-geometry boosting. Compared to the current engine, the system produces higher maximum boost pressure — 28 psi (195 kPa) — to help the engine make more power, and revisions to enhance the capability of the exhaust-brake system.

 

Along with a new camshaft profile and improved cylinder head design, the Duramax’s new variable-vane turbocharger enables the engine to deliver more power with lower exhaust emissions. It uses a more advanced variable-vane mechanism, allowing a 104-degree F (40 C) increase in exhaust temperature capability. The self-contained mechanism decouples movement from the turbine housing, allowing operation at higher temperature. That enables the engine to achieve higher power at lower cylinder pressure. Additionally, it has lower internal leakage, allowing more exhaust energy to be captured during exhaust braking.

 

The integrated exhaust brake system makes towing less stressful by creating added backpressure in the exhaust, resulting in negative torque during deceleration and downhill driving, enhancing driver control and prolonging brake pad life.

Venturi Jet Drain Oil Separator

 

A new Venturi Jet Drain Oil Separator employed with the Duramax 6.6L is the first of its type in the segment and is designed to ensure oil control in sustained full-load operation. The totally sealed system collects the fine mist of oil entrained in the blow-by gas and uses a small portion of the boosted air generated by the turbocharger to pump the collected oil back to the engine oil sump for re-use by the engine. Less sophisticated systems are not able to return this oil during full-load operation, which can result in oil carryover into the cylinders during combustion.

[jj46]

Now just need a confirmed build date. Probably won't see them on lots until Dec 1.

[SouthpawHD]

Now just need a confirmed build date. Probably won't see them on lots until Dec 1.

 

Per TFL.com, the new trucks will be available the 1st quarter of 2017.

 

As I stated before, I think this is HUGE mistake for GM from a timing standpoint. They had a chance to take some market share from Ford as they are just coming out now. Instead, Ford might be taking share from GM.

[jj46]

 

Per TFL.com, the new trucks will be available the 1st quarter of 2017.

 

As I stated before, I think this is HUGE mistake for GM from a timing standpoint. They had a chance to take some market share from Ford as they are just coming out now. Instead, Ford might be taking share from GM.

 

 

Wow... what the heck are they going to sell in the meantime? From what I'm seeing around here, there aren't a lot of HD 6.6s to choose from, relatively speaking. Can't order anymore unless it's a 2017... so....That seems like a huge delay/gap.

[20L8TSierra24]

 

 

Wow... what the heck are they going to sell in the meantime? From what I'm seeing around here, there aren't a lot of HD 6.6s to choose from, relatively speaking. Can't order anymore unless it's a 2017... so....That seems like a huge delay/gap.

My local dealer hasn't had a 6.6 in 3 months. There are a few in the area but only in WT trims

[Colossus]

Same here. Lots of W/T trims but very few LT/LTZ.