Does the New BMW 3 Series Have Backfire Sound?
2 Answers
BMW new 3 series does not have backfire sound. Introduction to backfire: Backfire usually occurs when the car releases the throttle, the exhaust pipe will suddenly emit flames accompanied by sound. Also known as backdraft, it refers to a fault phenomenon where the burned mixture fails to be discharged from the combustion chamber in time during the exhaust stroke, but instead flows through the intake valve into the intake pipe and ignites some fresh mixture, accompanied by abnormal noise. Causes of backfire sound: Backfire occurs more frequently when decelerating by releasing the throttle, the mixture is too lean, there are problems with the ignition system, the ignition advance angle is too large, or the ignition advance angle deviates too much from the accurate position.
I've driven the new BMW 3 Series M340i, which indeed comes with the exhaust backfire feature. It produces particularly cool crackling sounds during acceleration or downshifts in Sport mode. BMW engineers incorporated an overrun fuel injection function in the exhaust system design, allowing small amounts of unburned fuel to ignite in the exhaust pipes to create the sound. This feature comes standard on higher trims, but entry-level models like the 330i require the M Sport exhaust package as an add-on. The volume is adjustable via driving modes - I use it to enhance my daily commute, though it might be slightly noisy for neighbors in urban areas. I recommend test driving it, especially if you're passionate about driving excitement, as the exhaust note adds sportiness and reduces monotony. However, consider practicality too - BMW's overall performance is excellent, and the exhaust sound is just a bonus element. Don't overlook the complete test drive experience just for this feature.
