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Cadillac 3.6-liter twin-turbo V6 engine gets detailed

Produces up to 420 bhp (313 kW)

Cadillac has released new details about the twin-turbo 3.6-liter V6 engine that will power the 2014 CTS Vsport and 2014 XTS VSport.

Since the engine is Cadillac's first twin-turbo unit, engineers focused on making it refined and powerful. They specifically tackled turbo lag by developing and patenting a new air flow design that uses less heat-exchanger tubing. Cadillac says this helps to reduce air flow routing volume by more than 60 percent when compared to a conventional design that features a chassis-mounted heat exchanger.

As Richard Bartlett, Cadillac assistant chief engineer for the 3.6-liter engine, explained “By creating a very short path from the turbos to the throttle body, the compressors are able to draw air directly from the inlet box and send pressurized air through the intercooler immediately. This gives the driver a more immediate feeling of power on demand.”

All told, the engine produces 410 bhp (305 kW) and 369 lb-ft (500 Nm) of torque in the XTS VSport and 420 bhp (313 kW) and 430 lb-ft (583 Nm) of torque in the CTS VSport.

Both models go on sale this fall and CTS VSport will be priced from $59,995 while the XTS VSport will retail for $63,020.

Source: GM

Cadillac’s Twin-Turbo Kicks Turbo Lag to the Curb

Efficient air flow delivers better torque response for CTS Vsport, XTS Vsport

DETROIT – Turbocharging increases power and performance with efficiency, but the delay in the delivery of power – known as “turbo lag” – has historically been its key limitation.

That’s about to change.

Cadillac’s first-ever Twin-Turbo, available on the 2014 CTS Vsport midsize luxury sedan and XTS Vsport full-size luxury sedan in the U.S. this fall, kicks turbo lag to the curb with a unique combination of smaller turbochargers, top-mounted throttle body and shorter air pathways.

The Cadillac Twin-Turbo V-6’s patented air flow design, which eliminates circuitous heat-exchanger tubing, makes the most of engine packaging efficiency to improve torque response time over other air flow designs.

Rated at 420 horsepower in the all-new 2014 CTS Vsport and paired with Cadillac’s first eight-speed transmission, the Twin Turbo is one of the most power-dense engines in the midsize luxury sedan segment, rated at an SAE-certified 420 horsepower (313kw) and 430 lb-ft of torque (583 Nm).

Air flow routing volume is reduced by more than 60 percent when compared with a conventional design that features a chassis-mounted heat exchanger. The water-to-air cooler system achieves more than 80 percent cooling efficiency with only about 1 psi (7 kPa) flow restriction at peak power for fast torque production.

“By creating a very short path from the turbos to the throttle body, the compressors are able to draw air directly from the inlet box and send pressurized air through the intercooler immediately,” said Richard Bartlett, Cadillac assistant chief engineer for the 3.6L engine. “This gives the driver a more immediate feeling of power on demand.”

Using two smaller turbochargers rather than a single, larger turbo also helps ensure immediate performance because smaller turbochargers spool up quicker to generate horsepower-building air pressure that is fed into the engine. An integrated charge air cooling system also contributes because the compressors blow through very short pipes up to the intercooler.

The single, centrally located throttle body atop the engine controls the air charge from a pair of turbochargers after the temperature is reduced in the intercooler. This design fosters more immediate torque response and reduces complexity by eliminating the need for a pair of throttle bodies.

Together, smaller turbochargers, top-mounted throttle body and shorter air pathways help sustain peak torque over a broad range – 1,900 to 5,600 rpm – for a confident feeling of power in almost all driving conditions, such as accelerating or overtaking traffic on the highway.

“The Cadillac Twin-Turbo intercooler design builds on our experience with the 6.2L supercharged engine used on the current CTS-V Series,” Bartlett said. “That means more performance for drivers without sacrificing efficiency.”

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Comments (4)

 Aesthetics Aesthetics
taking full advantage of chargecooling
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July 28, 2013 1:02 pm
 ssllaasshh ssllaasshh
Opel Insignia! Opel Insignia! Opel Insignia!
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July 27, 2013 8:08 am
 sensei sensei
Technology = replacement for displacement.
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July 27, 2013 3:27 am
 PAA PAA
Good news. We ll check it out
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July 27, 2013 12:28 am