Pop & Bang, burble or crackle tunes achieve these sounds through delaying the retarding of fuel injection after TDC (Top Dead Centre) into the engine. This essentially means that excess fuel is injected into the combustion chamber for a short period of time after letting off the throttle. The ignition (spark) timing is then altered to combust the unburnt fuel during the exhaust stroke instead of the compression stroke, when the exhaust valves are opened, resulting in the pops and burbles you hear exiting out your exhaust system. ๐ Share, Comment, and save for more people to see. Thanks for your Support! #internal #combustion #engine #dyno #turbocharger #pop #bang #bangbang #burble #crackle #tune #antilag #als #manifold #intakemanifold #exhaust #mechanic #4stroke #mecanica #mecanique #auto #mechanical #power #automotive #turbine #turbo #compressor #mechanicalengineering #automobile #foryou