The pressure and heat waves can put added stress on turbocharger turbine wheels, exhaust system components, and can rapidly cause a catalytic converter to deteriorate. Keep in mind, that moving the exhaust event to outside of the combustion chamber isn’t consequence-free. Similar concepts known as anti-lag is used to build boost on turbo cars, and 2 step also can help a vehicle stage for a race launch, however, the crackle and pop tunes aren’t usually designed with these things in mind. Recently this has become popular because of the drama it adds to a car’s personality, but if done by an experienced tuner, it is mostly a euphonious sound modification. Many people ask if this helps, or hurts the tune.
That sound echoing through the exhaust is what creates the telltale crackles and pops. If done correctly the explosion will still be happening as the exhaust valve opens, letting the sound escape into the exhaust.
during deceleration after a full-throttle run. Now for a crackle and pop tune, during the exhaust stroke of the cycle, the ECU parameters are changed so unburnt fuel is ignited when the exhaust valve is still open in higher rpm area of the load table and there is a low throttle demand, i.e. Most modern vehicles have what is called a four-stroke engine, meaning that the piston has to move four times in order to make power.Īs seen in the diagram above, ideally ignition occurs just after TDC (top dead center – where the piston is at the highest position of its stroke). Crackles and pops are created when an explosion occurs outside the combustion chamber in the exhaust system. The main reason we’re seeing this rising in popularity is mainly because tunes like this make a car more fun for the driver.Ī Crackle and pop tune is simply an adjustment to specific ignition timing, fueling and other ECU parameters in order to achieve the desired effect. Well first off this tune is easily recognized by the telltale burbles and crackles heard during the deceleration of a vehicle. So what’s all the tuning buzz with the crackle and pop tune aka bangs and pops, popcorn, or burble tune? Why do they do it, and does it offer a performance benefit?
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