'Pops & Bangs' | Why It Occurs When Changing Gears [HPA Q&A]

Generally a sequential gearbox in a performance setup produces 'pops and bangs' when changing gears due to the fact shifting is done without the use of the clutch, so an ignition or fuel cut is used to 'unload' torque from the gearbox allowing it to shift through to the next gear.

With a synchromesh gearbox we can introduce 'flat shifting' which will incorporate a fuel or ignition cut and as a side effect produce similar noises, however, it doesn't necessarily make shifting any faster depending on your specific box.

What Andre doesn't discuss are 'pops and bangs' tunes that are sold for that purpose alone. These give no performance benefits alone, and generally is the result of poor ignition timing (overly retarded) or extra fuel being injected on deceleration (hence the lack of any performance gains, for a performance or motorsport applications this actually decreases it). This question was just one taken from the Q&A session of a free live lesson, linked below.

Learn more about EFI tuning via the next free lesson: https://bit.ly/3CfBAKi

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