CT6 engines reveal

[Fgts]

400hp/400 tq for the 3.0 tt with afm

 

335 hp/284tq for the "Cadillac" n/a 3.6

 

No v8 reveals yet, imo an lt1 "V sport" would be the next phase along with the hybrid model

 

CTS/ATS will also get the upgraded 3.6

 

http://www.autoblog.com/2015/03/20/cadillac-ct6-twin-turbo-v6-engines/

Edited March 20, 2015 by Fgts

[jpd80]

 

 

DETROIT – Cadillac today announced a new generation of V-6 engines, led by an exclusive Twin Turbo V-6 that will be one of the industry’s most advanced six-cylinder gasoline engines. It leverages the latest technology to balance efficiency, performance and refinement in the upcoming, top-of-the-range CT6 luxury performance sedan.

The all-new Cadillac 3.0L Twin Turbo is designed to achieve new thresholds of refinement and specific output for the brand’s new prestige luxury sedan, which makes its world premiere March 31, at the New York International Auto Show. Production begins late this year at General Motors’ Detroit-Hamtramck Assembly Plant.

Peak output is estimated at 400 horsepower (298 kW) and 400 lb-ft of torque (543 Nm), making it one of the most power-dense V-6 DOHC engines in the world, developing 133 horsepower (99 kW) per liter.

The 3.0L Twin Turbo is the only six-cylinder engine to combine turbocharging with cylinder deactivation and stop/start technologies to conserve fuel. Cadillac expects the combination to enhance fuel economy by up to an estimated 6 percent. Cylinder deactivation temporarily deactivates two of the cylinders in light-load driving conditions to enhance efficiency and seamlessly reactivates them when the driver demands full power.

With the stop/start system, the 3.0L Twin Turbo is shut down in certain driving conditions such as stop-and-go city driving to reduce fuel consumption, automatically restarting when the driver takes his or her foot off the brake pedal.

“Cadillac’s elevation on the world stage is driven in great part by its advanced powertrain technology and the all-new 3.0L Twin Turbo powers past the traditional segment leaders with higher degrees of the performance and refinement their reputations were built on,” said Rich Bartlett, assistant chief engineer.

The highly-acclaimed Hydra-Matic 8L90 eight-speed automatic transmission transfers the 3.0L Twin Turbo’s power to the CT6.

Similar to the turbo system in the track-capable Cadillac ATS-V, the new 3.0L Twin Turbo features turbochargers with lightweight, low-inertia titanium-aluminide turbine wheels and an efficient, patented low-volume charge-air cooler, which contribute to optimal boost production and more immediate power delivery.

The advanced, low-inertia turbochargers enable the engine to sustain peak torque from 2,500 rpm to 5,000 rpm, giving it a broad torque curve that is conveyed to the driver through a feeling of responsive, sustained power across the entire rpm band.

“Torque is the pulling power of an engine and the new 3.0L Twin Turbo delivers it with confidence-inspiring smoothness and progression,” said Bartlett. “In fact, the potency of the torque across the rpm band is matched only by the satisfaction of the horsepower created as those revs climb quickly to 6,500 rpm.”

The 3.0L Twin Turbo’s estimated 400 horsepower and 133 hp per liter is 27 percent greater than the BMW 740Li’s 3.0L twin-turbo V-6 (315 hp and 105 hp/L) and 29 percent more than the Audi A7’s 3.0L supercharged V-6 (310 hp and 103 hp/L).

All-new architecture

Cadillac’s new 3.0L Twin Turbo is part of a new generation of technologically advanced V-6 engines, which includes a new version of the award-winning 3.6L naturally aspirated engine employed for years across the brand’s model range. Each features all-new structural and combustion elements designed to complement higher performance and greater efficiency with exceptional quietness and smoothness.

The 3.0L Twin Turbo is up to 5 dB quieter than the Audi 3.0L TFSI engine, while the 3.6L is up to 4 dB quieter than the Infiniti 3.7L V-6.

Features shared by the 3.0L Twin Turbo and 3.6L include:

• Stronger, stiffer aluminum block with increased structure in the bulkheads for superior rigidity
• Tough, refined rotating assembly with a stiff forged-steel crankshaft, friction-reducing polymer-coated pistons and strong high-copper-content, sinter-forged connecting rods
• New four-cam phasing system with intermediate park technology that enhances efficiency by enabling late inlet valve closing in certain conditions
• All-new, patented “targeted” cooling system that provides strategic cooling of the engine’s hottest areas while simultaneously fostering faster warm-up, which enhances efficiency
• New cylinder heads that enhance combustion performance and include direct injection and feature integrated exhaust manifolds
• Revised, simplified timing drive system with cushioned chain sprockets contributing to quieter engine operation
• All-new oiling system moves the pump inside the block for quieter operation. The two-stage oil pump also enhances efficiency.

“This new architecture leverages the best of Cadillac’s proven, awarded V-6 engine technology and takes it farther with a finer focus on refinement and durability to match its benchmark output and efficiency,” said Bartlett.

A more complete look at the architecture, features and attributes of the new V-6 family is available in the 3.6L release.

Unique foundation

While the 3.0L Twin Turbo is based on the same, all-new architecture as the naturally aspirated 3.6L V-6, it incorporates specific components and features to support the load and cylinder pressure characteristics unique to a forced-induction engine.

Its 86mm bore specification is about 10 percent smaller than the 3.6L, while both engines share an 85.8mm stroke. The smaller bore reduces the size and consequentially the weight of the pistons in the 3.0L Twin Turbo, making the most of the rotating assembly’s geometry to match the quicker rev capability enabled by the low-inertia turbochargers’ quick spool-up.

“With nearly zero turbo lag and a commensurately low-inertia rotating assembly, this engine climbs the rpm ladder and produces power on demand,” said Bartlett. “Its performance is more than just the maximum output – it’s how it is delivered and the new 3.0L Twin Turbo delivers it with smoothness and precision.”

The smaller bores also allow larger water jackets between the cylinders, which helps maintain optimal combustion temperatures across the rpm band and during sustained high-load, max-boost performance.

Additional features unique to the 3.0L Twin Turbo include:

• Lower 9.8:1 compression ratio vs. 11.5:1 on the naturally aspirated 3.6L
• Extreme duty 44MnSiV6 steel crankshaft forging
• The pistons incorporate a specific steel insert in the top ring land to support the turbocharged engine’s higher cylinder pressures
• Large, 36mm intake valves and 29mm sodium-filled exhaust valves enable the engine to process tremendous airflow
• The valves are held at 19 degrees on the intake side and 16 degrees on the exhaust side vs. the 3.6L’s 18 degrees for the intake and 15 degrees for the exhaust
• Valve spring pre-load tension is increased to manage the greater exhaust pressure during peak load performance
• Hardened AR20 valve seat material on the exhaust side is used for its temperature robustness, while the heads are sealed to the block with multilayer-steel gaskets designed for the pressure of the turbocharging system
• Tuned air inlet and outlet resonators, aluminum cam covers and other features contribute to exceptional quietness and smoothness.
• Low-inertia turbochargers and vacuum-actuated wastegates

The twin, low-inertia turbochargers’ featherweight titanium-aluminide turbines are used with vacuum-actuated wastegate control for precise, responsive torque production. The titanium-aluminide turbines reduce rotating inertial load by more than 50 percent, compared with conventional Inconel turbine wheels. That means less exhaust energy – which spins the turbines – is wasted in stored inertial loads.

In practical terms, that means the relatively small size of the turbochargers and their lightweight turbines foster more immediate “spooling,” which practically eliminates lag, for an immediate feeling of power delivery. They produce up to 18 pounds of boost (125 kPa).

A single, centrally located throttle body atop the engine controls the air charge from both turbochargers after the temperature is reduced in the intercooler. This efficient design also contributes to more immediate torque response, while reducing complexity by eliminating the need for a pair of throttle bodies.

Unique vacuum-actuated wastegates – one per turbocharger – are used with the Twin Turbo for better management of the engine’s boost pressure and subsequent torque response for smoother, more consistent performance. They are independently controlled on each engine bank to balance the compressors’ output to achieve more precise boost pressure response.

The wastegates also work in concert with vacuum-actuated recirculation valves to eliminate co-surge from the turbos – a condition that can result in dynamic flow reversal, such as the moment immediately after the throttle closes. This overall system integration contributes to the engine’s smoother, more consistent feeling of performance.

Patented low-volume charge-air cooling

Cadillac’s patented, manifold-integrated water-to-air charge cooling system also contributes to more immediate torque response, because the compressors blow through very short pipes up to the intercooler.

With no circuitous heat-exchanger tubing, there is essentially no lag with the response of the turbochargers. Airflow routing volume is reduced by 60 percent when compared with a conventional design that features a remotely mounted heat exchanger.

“It is a very short path from the compressors to the intake ports,” said Bartlett. “The compressors draw their air directly from the inlet box and send their pressurized air through the intercooler immediately for a tremendous feeling of power on demand.”

The charge-cooling heat exchangers lower the air charge temperature by more than 200 degrees F (94 C), packing the combustion chambers with cooler, denser air for greater power. Also, the air cooler system achieves more than 80 percent cooling efficiency with only about 1 psi (7 kPa) flow restriction at peak power, which contributes to fast torque production.

Manufacturing

Both of Cadillac’s new V-6 engines will be produced at GM’s Romulus Powertrain Operations assembly facility, near Detroit, which received a $540-million investment to build the next-generation V-6 engines.

All-New, Advanced 3.6L V-6 to Drive Cadillac CT6
Next-gen engine sets efficiency, refinement and durability benchmarks
General Motors

[jpd80]

And by the way, this is what CT6 Customers will be offered instead of a V8

which will be limited to a range topper at a later date...

[ANTAUS]

Looks damn good...Ford better step up to the plate then...the 3.5L Ecoboost should be able to do north of that.

[jpd80]

And the 2.7 EB is.....already out there in F150 trucks and coming soon to Utilities.

Edited March 21, 2015 by jpd80

[RichardJensen]

Wait. How are these engines in the same 'family', when one is turbocharged and has significantly narrower bore spacing?

 

Seems like a decent engine.

 

But at the same time, this does raise the uncomfortable status of GM's V8 family--there's a huge gap between the 3.0L TT and the V-Series, and frankly, GM should have had a V8 there.

[jpd80]

Wait. How are these engines in the same 'family', when one is turbocharged and has significantly narrower bore spacing?

 

Seems like a decent engine.

 

But at the same time, this does raise the uncomfortable status of GM's V8 family--there's a huge gap between the 3.0L TT and the V-Series, and frankly, GM should have had a V8 there.

I've been saying this for a while now, GM is ignoring Cadillac buyers who like their V8s,

what is Cadillac if not the quintessential American V8 car...

[RichardJensen]

Well, they're not exactly ignoring them....

 

GM's V8 problem is that they don't have a very good range. They effectively have only two types of V8s: "Truck engine" and "lots of horsepower engine".

 

It's all fine and good to put the truck engine V8 in the Camaro, but they can't do that with the Cadillac.

 

But GM is not about to go OHC across the board with their V8s, for reasons that only they know, nor can they find money to fund a "Northstar" replacement.

 

So, effectively, GM is hosed when it comes to Caddy V8s, leaving them a pretty sizable gap once they start to play around in the luxury stratosphere.......... You can get a 600hp V-Series, or a 400hp V6. You can't get a ~450hp V8.

[jpd80]

And that's where the confused market comes in, previous CTS buyers would probably embrace the LT1 6.2 and 8L90

but those trying to elevate Cadillac's status would frown on such a vehicle as undoing any advance in perception.

 

I still can't believe they threw the CTS model under a bus to go chase BMW, one properly developed Alpha

car to replace the previos CTS was all that was needed, the over complexity of two vehicles simply

confuses all and sundry by making the new generation look over priced compared to previous cars.

Edited March 21, 2015 by jpd80

[Fgts]

An LXF based tt v8 is being developed said to be around 4.0 l. There is a rumoured n/a lt1 powered version to be underneath the 4.0.

 

The tt 3.0 needs to be in the ATS "V-Sport" asap .

[akirby]

Only 6 years late, but looks good on paper.

 

Lincoln is also working on a 3.0LEB - will be interesting to see the comparison. I expect slightly higher numbers.

[RichardJensen]

An LXF based tt v8 is being developed said to be around 4.0 l. There is a rumoured n/a lt1 powered version to be underneath the 4.0.

 

The tt 3.0 needs to be in the ATS "V-Sport" asap .

 

So the entry level V8 on a Cadillac is reportedly going to be a 2V pushrod engine? That's going to go over *real* well with car snobs.

[jpd80]

 

So the entry level V8 on a Cadillac is reportedly going to be a 2V pushrod engine? That's going to go over *real* well with car snobs.

It's strange the different perceptions within Cadillac, an OHV DI V8 engine is more than acceptable in Escalade,

a vehicle that commants superior pricing yet the same engines in luxury cars are some how cause for derision.

 

GM needs to wake up and realise who its Cadillac buyers really are and start listening to them, not the people who

want Cadillac to be ego driven copy of German luxury marques. Not everything has to be a carbon copy of those

competitors, it's the points of differences that are key in giving buyers reasons to choose Cadillac over them.

If there is no difference, then it comes down to a straight choice of badge and price, something Cadillac cannot win.

Edited March 22, 2015 by jpd80

[Ron W.]

 

So the entry level V8 on a Cadillac is reportedly going to be a 2V pushrod engine? That's going to go over *real* well with car snobs.

 

Keep in mind that most people wouldn't understand 2 valve versus 3 valve or pushrod V8 versus OHC V8.

[RichardJensen]

True. However, most people are not buying $90k luxury sport sedans.

[papilgee4evaeva]

Twin-turbo pushrod V8?

 

[RichardJensen]

HOLY CRAP.

 

I had NO idea that VW was still producing that engine.

 

But at the same time, how many people that own Mulsannes actually drive them?

[papilgee4evaeva]

Don't know about the Mulsanne, but when I went to school in DC, I saw a few Arnages that were most certainly not being driven by chauffeurs.

[rmc523]

All the Mulsannes I see around here are driven by owners (or at least theres only a driver/no evident chauffeur).

 

Same goes for Phantoms too, for that matter.

[atomcat68]

The idea when Rolls Royce and Bentley were the same company is that Bentley were to be driven by the owners and RR was to have a chauffeur.

 

Bentley had a rich racing heritage so it was supposed to be a driver's car although much of the product in the 80's and 90's seemed to ruin that. VW made a smart decision to go back to that, breaking it completely from RR's influence which BMW took over.

[RichardJensen]

I just don't even........

 

Are people who are unashamed of spending >$300k on a sedan ashamed of hiring someone to drive it?

 

You can get a Mulsanne with a champagne chiller AND custom Bentley branded champagne flutes. Why on EARTH would you drive a car that was so obviously intended to be ridden around in?

 

I mean, are people buying these things because they can't possibly spend more money on a sedan, and they don't even care that the owner is supposed to spend his time in the back seat----where all the goodies are?

[twintornados]

I just don't even........

 

Are people who are unashamed of spending >$300k on a sedan ashamed of hiring someone to drive it?

 

You can get a Mulsanne with a champagne chiller AND custom Bentley branded champagne flutes. Why on EARTH would you drive a car that was so obviously intended to be ridden around in?

 

I mean, are people buying these things because they can't possibly spend more money on a sedan, and they don't even care that the owner is supposed to spend his time in the back seat----where all the goodies are?

Spending scads of cash does not smart make....

[papilgee4evaeva]

I dunno... people pay more than that for small aircraft then fly it themselves.

 

Guess they just like it. I mean, in the case of the Mulsanne, their rationale must be "why pay for Super Duty-level torque, then not allow myself to harness it?"

[sullynd]

Guy who owns a Continental GT near me has always washed it himself at the cheapie DIY place in town.

[fordmantpw]

All the Mulsannes I see around here are driven by owners (or at least theres only a driver/no evident chauffeur).

 

Same goes for Phantoms too, for that matter.

 

All the Mulsannes (Bentleys, RRs, Ferraris, Bugatti, etc.) I see around here are just pictures that I see on the internet.