About this experiment
A browser-based RPM simulator with 151+ real engine sample sets, paddle shifters, and a working fuel system.
Roar is an interactive engine sound lab. Pick a car from the garage, fire the ignition, and the page renders a working instrument cluster with a live tachometer, speedometer, fuel gauge, gear indicator, and trip odometer. Hold the throttle to climb RPM and the synthesised exhaust note tracks load through on-throttle and off-throttle sample crossfades, just like the real engine it was captured from.
The goal is to let car enthusiasts sit with the sound of a Ferrari V12, a McLaren V8, a flat-six 911, or a 70s muscle car small block for as long as they want, without owning, leasing, or hearing- damaging the neighbourhood.
Each vehicle ships with its own peak RPM, redline, rev limiter behaviour, gearbox ratios, tank capacity, and fuel-flow profile. Pressing the throttle moves the RPM through inertia rather than jumping, so the engine breathes the way a real one does. Up- and downshifts crossfade samples between gear ratios; a downshift while still on-throttle triggers a brief rev-match.
Fuel drains as a function of throttle position × RPM fraction, with a small idle sip. The HUD shows current flow in litres per hour and a live tank fraction. The trip odometer is time-compressed so a few minutes on the throttle moves the needle, but distance and fuel consumption are scaled together, so each car's overall economy stays consistent with the real-world figures it was tuned to.
Touch: on-screen throttle, brake, paddle shifters, ignition, and a tap-zone gear changer. Vibration haptics fire on Android.
Keyboard: Space or W for throttle, B or Down arrow to brake, Left / Right arrows (or A / D, R / F) to shift, E to start or stop the engine.
Engine samples curated from publicly licensable automotive sound libraries and original captures. Vehicle physics figures derived from manufacturer published specifications. Roar is a sound laboratory, not a racing simulator, and is not affiliated with any of the manufacturers listed.