Pops & bangs

Pops, Bangs & Crackles

This feature can be programmed into the ECU on some petrol and diesel vehicles which results in a pop and bang or crackle noise coming from the exhaust system during engine deceleration. Many manufacturers already implement such a feature from factory on some performance models. The feature offers no performance advantages but does offer a sportier feel and noise.

Normally during engine deceleration the injectors are switched off to prevent fuel from entering the combustion chamber. When applying a pop and bang patch to an ECU we request the injectors to stay open for a short period of time after the throttle plate has closed. The spark timing maps are then adjusted so that the fuel is ignited substantially after TDC (Top Dead Centre). This results in fuel igniting during the exhaust stroke and creating small explosions within the exhaust system. These small explosions are what create the popping and banging noise and in some cases small flames can be seen exiting from the rear silencers.

pop & bang sounds awesome! You can hear them when you lift off the throttle pedal during, deceleration or braking or when releasing the throttle between shifts. It definitely turns a lot of heads, but it also gives you the feeling of driving a hardcore sports car, since these kinds of sounds have usually been reserved for the top notch supercars. Well, now you can have them, too!

Secondly, for turbo engines, it adds another benefit of the mentioned anti-lag system, which greatly improves the reaction time of the turbocharger. After pop & bang modification, your turbocharged car will not only sound meaner, but it will also be faster and offer that amazing feel of continuous acceleration that many turbocharged cars lack.

Is Pop & Bang Safe?

Even though the mere fact that the explosions happen in the space that is not designed to deal with the resulting temperatures should mean that pop & bang is not safe, if the schubabschaltung modification is properly developed, it is safe.

In fact, many car companies such as VW, BMW, Mercedes-Benz and Lamborghini offer OEM pop & bang feature and that one is bound to be safe. In most cases, this feature is activated in sports mode.