Track day noise limits
Static tests, drive-by meters and quiet days: how circuits measure noise, what the numbers mean, and how to avoid being sent home.
Most circuits have neighbours, and most have a planning licence that limits how much noise they can make. That's why every track day has a noise limit, and why a car that's fine at one circuit can be sent home from another. It's also the reason some circuits run "unsilenced" days only a few times a year.
The two kinds of test
Static test. Done in the paddock or at the pit lane entry before you go out. A marshal holds a meter at a set distance (usually half a metre) and angle from the exhaust, and you hold the engine at a set speed, often three-quarters of the rev limit for cars, or the figure the organiser gives for bikes. The reading has to be at or under the limit. A common UK static limit is 105dB, with stricter "quiet" days at 102dB or lower.
Drive-by. A meter at the side of the track measures you as you go past at full throttle. It's usually placed where cars are loudest, such as the exit of a slow corner onto a straight. Typical drive-by limits are around 92dB at many UK circuits, but they vary a lot. Go over it a few times and you'll be shown the black flag and asked to quieten down, short-shift past the meter or go home.
Many people pass the static test easily and then trip the drive-by. Exhaust drone at full throttle, intake roar and tyre noise all count.
Where to find the limit
The organiser lists it for each event, and we show it next to dates on the calendar wherever it's published. The same circuit can have different limits on different days, so always check the specific event, not just the circuit.
Will my car pass?
- A standard road car or bike almost always passes a 105dB static test.
- Cars with sports exhausts and no centre silencer, decat pipes, straight-through backboxes and loud induction kits are the usual failures.
- Bikes with race cans and the baffle removed rarely pass a standard UK test.
- Turbocharged cars tend to be quieter than big non-turbo engines.
If you're unsure, ask the organiser or a local garage to meter the car before you book. A removable baffle or a spare quieter silencer is worth carrying.
Tips for passing on the day
- Go to the static test with the engine fully warm. A cold engine can read higher.
- Close the windows and turn off the stereo.
- On track, learn where the drive-by meter is (it's often mentioned at the briefing) and short-shift past it if you're close to the limit.
- If you're metered over, it's usually three strikes and out. Take the warning seriously.
Unsilenced and loud days
Several circuits run a few higher-limit or unsilenced days a year, which are the only option for loud race cars and bikes. They're popular and sell out quickly, so filter the calendar by circuit and keep an eye on the organisers' formats.