Pops, bangs and crackle for your EV.
Lift off and hear the exhaust crackle. WattGrowl synthesizes overrun pops, limiter bangs and rally anti-lag live on your phone and plays them through your car speakers. No hardware, no exhaust valve, no wiring.
iPhone Coming soon
- Crackle on lift-off
- Limiter bangs
- Anti-lag
- POP button
How it works
The crackle comes from the way you drive.
A tuned gas car pops on the overrun: you lift off the throttle, unburnt fuel meets a hot exhaust, and it crackles. An electric car has no exhaust, so WattGrowl recreates the moment instead. It reads your phone's motion sensors and GPS, works out when you lift off, brake or hit the limiter, and fires the pops in time with the engine sound.
Because the engine is synthesized rather than played from a loop, the pops follow the revs and the load. A gentle lift gives a few soft burbles; coming off the throttle at high revs gives a sharp, rattling volley.
- Overrun crackle when you lift off, shaped by that engine's own exhaust.
- Limiter bangs when the revs hit the cut.
- Rally anti-lag on the rally engine, popping and chattering between corners.
- Dual-clutch "brap": an ignition-cut crack on every fast upshift.
- POP button for a backfire while you stand still.
Make it yours
Mild burble or full volley.
Every engine pops differently, and you decide how much.
Different engine, different pops
A big V8 burbles, a straight-six crackles, a rotary spits. The pops follow each engine's exhaust and character, across 37 synthesized engines.
Pops fader in the Sound Studio
Turn the pops up or down on their own fader next to exhaust, intake, mechanical and turbo, then shape the whole mix with the equalizer.
Pops and bangs in the Workshop
Open the Engine Workshop and tune the pops and bangs section of any engine, or build a new engine from scratch with its own crackle.
FAQ
Questions about pops and bangs
Can an electric car make pops and bangs?
Not by itself: there is no exhaust and no combustion. WattGrowl synthesizes the pops on your phone from the way you drive and plays them through the car speakers, inside the car.
When do the pops happen?
On lift-off, like a tuned car on overrun: when you come off the throttle the engine crackles through its exhaust. You also get limiter bangs, anti-lag on the rally engine, a dual-clutch upshift brap, and a POP button for a backfire at a standstill.
Do all engines pop the same way?
No. Each engine's pops are shaped by its own exhaust and character, so a big V8, a straight-six and a rotary each crackle differently. You can make them milder or wilder in the Sound Studio and the Engine Workshop.
Are the pops free?
Yes in the simulator and in garage rev mode, which are free. Pops from your real driving are part of Live Drive, the premium feature: try it free for 3 days on the yearly plan, then $2.99 a year, or $14.99 once for life.
Can people outside hear the pops?
Only as much as they would hear your car stereo. The sound is for the people inside the car; WattGrowl is not a pedestrian warning system, does not replace your car's AVAS and has no exterior speaker.
Explore
More from WattGrowl
Bring the crackle back.
Try the pops for free in the simulator, then take them on the road.
iPhone Coming soon
Follow us on Instagram @engine_sound_app for new engines and the iPhone launch.