General Motors said that a new model will be added to the Cadillac brand beginning next month. GM is referring to a new 308hp 3.6L direct-injected V6 engine that features a driver-selectable ECO Mode for optimal fuel economy. The 2012 SRX has a starting price of $36,060 (inclusive of $875 destination charge).
Among the upgrades and revisions in the SRX for 2012 are standard Bluetooth on all models, an optional heated steering wheel, a xenon Blue Metallic exterior paint option that will start being available in fall 2011, an all-ebony interior option with contrasting stitching, and a new 20-inch wheel finish option.
Don Butler, Cadillac vice president of marketing, said that the crossover category is considered as one of the largest and most significant segments in the luxury market. He stated that GM will be building on the success that the SRX has achieved as the top-selling Cadillac worldwide.
The other highlights of the SRX include HID headlamps with Adaptive Forward Lighting, Bose 5.1 surround sound with navigation, a full-color LCD Driver Info Center, and a rear-view camera system.
OnStar is offered as standard and it features myCadillac and OnStar RemoteLink mobile apps and Stolen Vehicle Assistance. In addition, SRX has been fitted with an advanced All Wheel Drive system with electronic limited slip rear differential that moves power front-to-rear as well as distributes power across the rear axle depending on driving conditions and traction.
Adaptive Real-Time damping technology is used on the chassis for exceptional ride control. The braking system features Rainsense automatic windshield wipers, allowing the brakes to make slight periodic caliper applications. It also keeps rotors dry, guaranteeing maximum stopping power in wet conditions.
The LFX engine that powers the SRX is mated to the automatic 6-speed Hydra-Matic 6T70 transmission. This transmission is controlled electronically and has the tap down/tap up driver control. Since it has an overall 6.04:1 ratio spread, it enables a steep first gear and a tall overdrive top drive that is crucial for road cruising at low-rpm. The wide ratio spread also means that fast acceleration is possible even from standstill.
This ensures that acceleration is maximized while the fuel economy is optimized. During cruising, it ensures that the noise of the engine is lowered. The sixth gear meanwhile is the overdrive ratio that allows the revolution of the engine to be as low as possible to make it suitable for highway cruising. It helps lower the losses due to the engine friction and also enhances fuel economy. With the help of the Eco feature, which is driver-selectable, it enables the 6T70’s shift points to be altered and this boosts the fuel economy by as much as 1 mpg.
Improving the fuel economy as well is the addition of the clutch to the variable displacement compressor of the air conditioning. As a result, the compressor only operates when it is needed and does not add drag even when it is turned off. To ensure that this model is able to attain the performance goals set, the engineers had to redesign its exhaust system. Specifically, the team put in dual runners starting from the engine and all the way to a collection point that has been placed further rearward.
Both the length and the diameter of its pipes were tuned in order to enhance the low-end torque starting at 1,200 rpm and up to 3,000 rpm. The exhaust pulses are able to vibrate from the engine’s cylinders and have been timed in order to get to the collection point so that they will be able to phase together accurately.
This is a tuning effect that is also known as scavenging. What this process does is to pull the exhaust gases from out of the engine and then coordinate it with the low pressure and high pressure pulses for each of the cylinder. The result is that the maximum torque is now possible even at 2,400 rpm and continues at the level until 5,300 rpm.
Power and torque were improved. The company did everything especially when it came to having the LFX’s airflow optimized, from the times it goes inside the engine to the point that it goes out in the muffler, Pilibosian shared. Because of this amazing airflow, the company was able to surpass its target of 300 horsepower, she added. At the same time though, she continued, the company made sure that the variable dual valve timing system was delicately calibrated and thus with the exhaust system, it led to the engine bearing excellent low-end torque.