2018 Chevrolet Tahoe is a sport utility vehicle of the American car manufacturer Chevrolet sold since 1994. Currently it is in its third generation. Tahoe also exists at GMC as the Yukon. And at Cadillac under the name of Escalade. Chevrolet Tahoe 2018 model is available in two AWD transmissions and 4WD which represent a significant price differential but improved 4WD off-road capabilities and is available in several Finish: LS, LT, LTZ, Z71 (improved for off-road); And in extended version, the Suburban.
2018 Chevrolet Tahoe Engine and Transmission
On cars eight- cylinder V-shaped GM Vortec engines of the fourth generation with a working volume of 4.8 liters and capacity of 290 hp were installed. ( LY2 ) and a working volume of 5.2 liters and a power of 320 hp. ( LY5 ). The engines were installed longitudinally in front, had a cast-iron cylinder block and an aluminum head with an overhead valve ( OHV ), two per cylinder, with hydraulic compensators in their drive at the 5-liter engine. Fuel injection – distributed phased, ignition – with individual coils for each candle.
In 5-liter engines to save fuel under certain road conditions, the engine management system disengaged half the cylinders. This happened by stopping the supply of pressure to the hydraulic compensators of the valve drive. Disconnection of the cylinders occurred almost imperceptibly, and when additional power was required, the cylinders were connected again. 5-liter engines special equipment (LMG) could work on a mixture of gasoline and ethanol E85. GMC Yukon all-wheel drive vehicles were equipped with a new 5.3 liter engine (LC9) with an aluminum cylinder block, working both on gasoline and on biofuel E85.
All cars, both Tahoe and Yukon, were equipped with an automatic four-speed gearbox with electronic control. The shift lever was located on the steering column to the right of the steering wheel, as is customary in American cars. On request, the rear axle could be equipped with a lockable differential.
2018 Chevrolet Tahoe Denali
The GMC Yukon Denali flagship car installed almost all of the equipment mentioned above. It had an all-new 6.2-liter 380-horsepower Vortec 6200 engine with an aluminum cylinder block and a variable valve timing system. The engine was aggregated with a new six-speed automatic transmission. The box had electronic control, a wide range of gear changes and two boosting gears. This created an excellent balance between power and economy of the car. In addition, the box had a manual shift mode with the button on the shift lever. The Chevrolet Yukon 2018 equipped with active suspension Autoride and 18-inch wheels from polished aluminum.
2018 Chevrolet Tahoe Hybrid Version
In a single body of electromechanical transmission there were two 60 kW electric motors, three planetary rows and four wet clutches. This combination of nodes allowed the transmission to operate both in the mode of steplessly changing the gear ratio, and in the mode with a set of four fixed gears.
Electromotors work well at low speeds, but quickly lose efficiency with increasing speed of rotation. Therefore, they were used for steplessly changing the torque for light loads and at low speeds. With increasing loads including clutches in various combinations, one of four fixed gears could be obtained. The control system, analyzing the movements of the car, chose the mode of operation of the transmission either on electric traction, or from the engine, or a combined mode.
There were, as it were, two transmissions: stepless for working in light modes and with fixed transmissions for working in heavy traffic conditions. When driving on highways at high speed or with heavy work with high loads, electric motors were not involved, and the transmission functioned like a conventional automatic transmission. But, if necessary, the electric motors could add torque to the transmission or be used to charge the batteries. The 2018 Chevrolet Yukon reverse motion always occurred on the electric traction.