What does the BMW 740's integral active steering modification mean?
2 Answers
Integral Active Steering refers to BMW's integral four-wheel steering system. It is completely different from the active steering system. By using an electric motor to adjust the rear wheel angle, it achieves smooth and stable cornering at both high and low speeds. Currently, it is only available on high-end models: the BMW 7 Series has a steering angle of 3 degrees, and the 5 Series GT also features it. Superimposed Steering System: In the Integral Active Steering system, a hydraulic or electric servo steering system is first required as the foundation. In the steering transmission route, the steering column between the steering wheel and the servo steering gear is disconnected. At the disconnection point, a steering angle actuator is added as an electronic adjustment device, consisting of an electric motor and a reduction mechanism, which increases or decreases the steering angle based on the vehicle's state and the driver's input. Due to this superimposed steering angle, this system is also called a Superimposed Steering System. Steering Gear Function: The function of the steering gear can directly act on the wheels and still satisfactorily return to pure mechanical capability with the help of the actuator, independent of the basic servo steering system. Therefore, the safety of its electronic adjustment chain is referred to as "fail-safe" or "fail-silent." The industrialization of the Active Steering-Cross Unit can be achieved in different ways.
The BMW 740's Integral Active Steering is an intelligent system on the car where the rear wheels can turn along with the front wheels, making turns more stable and agile. When you talk about modifying it, it involves adding or upgrading components, like reinforcing the steering control module or replacing it with more sensitive sensors to improve response speed. I've seen many people do this kind of modification, especially for city driving—it reduces the turning radius, making parking much easier. On highways, lane changes become more precise. However, this isn't a minor task; you need to consider the vehicle's electronic system compatibility. For example, the factory software might not recognize third-party components, triggering warning lights or causing handling issues. I recommend consulting a professional tuning shop for testing to ensure all wiring connections are secure, avoiding short circuits or overheating issues. Cost-wise, the whole setup isn't cheap, starting at several thousand yuan. But if you're passionate about driving, this investment can bring immense fun and confidence, especially noticeable on mountain roads or slippery surfaces.
