The Cadillac SRX features a choice of two high-tech powerplants – the legendary Northstar V8 or a highly-efficient, all-aluminium V6 engine with variable timing of both the intake and exhaust valves.
For fitment in the SRX, the 4.6-litre, 32-valve V8 Northstar engine was extensively re-engineered to make its first appearance in an all-wheel drive vehicle. It is a sophisticated, technically advanced powerunit that generates 330 ps at 6400 rpm and 427 Nm of torque at 4400 rpm.
The engine incorporates a host of technically advanced features including electronic ‘drive-by-wire’ throttle control and variable valve timing for extremely accurate fuel injection and more efficient combustion. The new VVT system also eliminates the need for an exhaust gas recirculation (EGR) system and close coupled catalytic converters, mounted directly adjacent to the exhaust manifold, give added efficiency and rapid warm-up from cold.
The six-speed 6L50 Hydra-Matic automatic transmission provides both increased performance and fuel efficiency. It features a generous 6.04:1 overall ratio that ensures strong ‘launch’ acceleration from standstill, while also providing a ‘tall’ overdrive top gear for enhanced fuel economy (improved by 4%) and reduced noise during cruising.
The 3.6-litre V6 VVT powerplant develops 261 ps at 6500 rpm and 344 Nm of torque at 2800 rpm. This 60-degree dual overhead cam (DOHC), 24-valve engine boasts electronic throttle control, variable valve timing, multi-port fuel injection, two-stage roller chain cam drive, aluminium block and cylinder heads and a forged steel crankshaft. Up to 90 per cent of peak torque is available in a wide band from just 1600 to 5800 rpm. It is coupled to a five-speed 5L40 Hyrda-Matic automatic gearbox.
Both the five- and six-speed automatic transmissions feature Driver Shift Control (which offers clutchless sequential manual shifting), electronically controlled engine braking, downgrade detection with brake assist (to help control speed during hill descents), Performance Algorithm Liftfoot (to prevent premature upshifts) and a Transmission Control Module (TCM) that detects a drop in vehicle speed prior to entering a turn, and gives up to two downshifts to provide the driver with maximum engine braking.