26/09/2026
💥💣🔥 Crackle, Pop + Bang!! 🔥💣💥
One I often get asked about, and more often than not I refuse to do full-on Pop+Bang files for engines with less than 6 cylinders as it usually sounds absolutely horrendous. However, Audi RS54.2 V8 with MED17.1.x ECU, decat with resonator delete I recently tuned was the perfect candidate to add a little bit of audible "drama".
So....How is it done? Lets jump into Winols5 and take a look 👀
💥 "Crackle" is my preferred method of adding a bit of drama, the crackles are subtle without being overpowering and they do not create the same level of shockwaves a full Bang map creates and is definitely more component friendly (sill not without risks) - We can generally achieve this by simply adjusting the Overrun injection cutoff/DCO time. Usually when you lay off the throttle, the injectors shutdown drastically and they inject only the necessary fuel to maintain engine momentum. However as you can see in the pictures of the relevant "maps", we simply instead ask the injector to remain "open" for a commanded period of time (in this particular case an additional 2 seconds as can be seen in the table. This allows additional unburnt fuel to pass the Exhaust Valves and enter the exhaust, the fuel then finds sufficient heat in the exhaust, explodes and gives us a crackle - doing this means the majority of the "explosion" happens in the exhaust and not the engine. On anything with 6 cylinders and above, this can sound incredibly sexy. Many OEM high performance cars such as BMW and Audi have a minor over-run from the factory (often when in sport mode).
💣"Pop + Bang" - This is Hooligan mode. It makes children and old people run for their lives when they get startled by it 🙈. Its usually done by doing all of the above with crackle, however I then have to add a drastic negative ignition swing at low engine load.
In the timing charts in the images you will see the "staircase" effect where the purple negative figures ask the ECU to "re**rd" the ignition timing (as a general rule the more negative timing you add causes a louder bang - to a point). At roughly -21 degrees of (negative) ignition timing we create an explosion in, or much closer to the combustion chamber, this creates additional heat, shock and stress but causes an incredibly loud "bang" through the exhaust system and gives a harsh motorsport style exhaust note. If desired we can also make thing shoot flames.... 🔥
This can often be fully customised at certain RPM levels, and in this case was left so it only activated in Sport mode.
‼️DISCLAIMER - I'm always honest, these type of aggressive pop + bang tunes are likely to cause potential damage to engine and exhaust components, will probably p**s your neighbours off, and will attract the attention of the Rozzers 🚓🚓🚓 (you have been warned)
So yeah - that's how we make things noisy, hope it gives a brief outline of how its done and I'm sure its given useful insight for some of the local "tuners" who watch the page ;)
Custom tuning with software developed in-house, no slave or generic files - unique to this neck of the woods in . Drop me a message or visit the website for a quote.
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