226 sounds for anything with wheels, and a few things without. Seven engines (a small car, a sports car, a V8 muscle car, a diesel truck, a sports bike, a V-twin chopper and a scooter), each looping from idle to redline and starting, stopping, revving, accelerating through the gears and passing by; electric cars; tyres skidding, squealing and rolling on asphalt, gravel, dirt and wet road; crashes; the car around the driver; horns and sirens; buses, trucks and trains; and bikes, boats, helicopters, planes and a tank. 63 of them are seamless loops.

Every one plays in the preview video.

What's inside

• Engines (38): idle, low, mid, high and redline loops for the car, sports car, muscle car, truck, motorbike, chopper and scooter, and an electric car slow, mid and fast

• Driving (56): every engine starting, stopping, revving, accelerating through the gears, slowing and passing by, an electric car, a start that won't catch, gear shifts, backfires, turbo blow-off

• Tyres (23): short and long skids, a squeal loop, a burnout, handbrake turns, rolling on asphalt, gravel, dirt and wet road (loops), puddle splashes, bumps, a pothole, a rumble strip, a tyre bursting and going flat

• Crashes (19): into a wall, into another car, heavy trucks, a rollover, fender benders, metal scraping, a windscreen shattering, debris, a hubcap rolling away

• Car (35): doors opening, closing and slamming, truck and sliding van doors, the trunk and hood, keys, the ignition, a seatbelt, indicator and hazard lights, wipers, electric windows, the handbrake, the gear stick, lock and unlock chirps, a car alarm, the fuel cap and a refuel

• Horns (14): car horns short, long and double, a small car, a truck's air horn, a bus, a scooter, a motorbike, bicycle bells, a train horn, a tram bell

• Sirens (10): police wail, yelp and hi-lo, ambulance and fire truck (loops), police and ambulance passing, siren chirps, a police air horn

• Transit (11): air brakes, a bus's doors and kneeling, a reversing beeper, a jake brake, a train's wheels (loop), passing and braking

• Others (20): a bicycle freewheeling and riding, a skateboard rolling and an ollie, a boat's outboard and a boat passing, a helicopter and a propeller plane (loops and fly-bys), jets, tank tracks, a tractor, a go-kart, nitro boosts, an impact wrench

• Every sound as WAV (48 kHz, 24-bit) and OGG, in folders by category.

• Engine loops at five speeds for each of the seven engines: cross-fade between them, or pitch one loop up and down with the throttle.

• 63 seamless loops, named _loop, with no click or bump where they wrap.

• Levelled for play: engines sit under the crashes and horns, and the defaults already balance.

• Trimmed, with no clicks at the edges. Works in any engine: Godot, Unity, GameMaker, Unreal, web and mobile.

Made for

• PSX Vehicles: the low-poly cars, trucks and bikes to drive with these sounds.

• PSX Gas Station Kit: somewhere to pull in and refuel.

• Explosion FX: for when a crash goes further, as sprite sheets.

In the Unity package: every sound as an AudioClip, a folder per kind, and a demo scene with a button per sound.

Try it in your browser: https://heyheythere.com/demos/vehicle-sfx/

The Python code that synthesises every sound and the demo's C# scripts were written with the help of AI (Anthropic's Claude); no generative audio model, no samples, no recordings. Every sound passes an automated check for clipping, clicks, silence and loudness.

Third-party component details are documented in Third-Party Notices.txt in the Unity package.