.

Chevy’s Colorado gets new diesel heart

POSTED BY Nigel Andretti ON 29 July 2015

CHEVROLET has introduced the diesel version of its 2016 Colorado midsize pickup truck.

With 500Nm of torque generated by the all-new 2.8L Duramax turbo-diesel, the Colorado’s maximum trailering capacity rises to 3,492 kg on 2WD models, with estimated fuel economy projected by GM to top the already segment-leading efficiency of the gas models (8.7 l/100 km) highway with 2.5L gasoline engine and automatic transmission.

The company said the new Duramax is the cleanest diesel truck engine it has ever produced.

The Colorado’s new 2.8L Duramax turbo-diesel is part of GM’s global family of turbo-diesel four-cylinder engines, and features a variable-geometry turbocharger for optimal power and efficiency across the rpm band and a balance shaft for greater smoothness.

Power is SAE-certified at 181hp at 3,400 rpm and 500 Nm at 2,000 rpm. A broad torque band makes it very powerful at low rpm, while the turbocharged performance provides immediate and smooth horsepower on demand.

It is a no-compromise turbocharged engine that is also really fun to drive, with excellent responsiveness. It was also designed specifically for trucks and has undergone many of the same validation tests as the 6.6L Duramax.

The Duramax 2.8L is the cleanest diesel truck engine ever produced by General Motors, thanks in part to a cooled exhaust gas recirculation (EGR) system.

The cooled EGR contributes to lower emissions by diverting some of the engine-out exhaust gas and mixing it back into the fresh intake air stream, which is drawn into the cylinder head for combustion. That lowers combustion temperatures and rates, improving emissions performance by reducing the formation of NOx.

colorado2

To control vibration and noise inside Colorado, engineers integrated a Centrifugal Pendulum Vibration Absorber (CPVA) in the torque converter used with the standard Hydra-Matic 6L50 six-speed automatic transmission. It marks the first application of a CPVA in a GM vehicle and the first time it has been used in the midsize truck segment.

The CPVA is an absorbing damper with a set of secondary spring masses, that—when energized—cancels out the engine’s torsional vibrations so the driver and passengers can’t feel them.

The Colorado’s integrated, driver-selectable exhaust brake system is based on the system introduced on the 2015 Silverado HD models and uses the compression power of the 2.8L Duramax engine to improve vehicle control and reduce brake pad wear.