Phormula KS-3 Knock Detector

The Phormula KS-3 Knock Detector is a powerful, innovative engine knock detection and alert system. Engine knock or detonation can destroy an engine in a matter of seconds. The KS-3 alerts the driver to unsafe knock levels.
* Complete kit – Includes sensor and 3 metre sensor cable.

£235.00 (ex VAT)


The Phormula KS-3 Knock Detector features:

Clear Knock Warning

Audible and visual knock light warnings 

Phormula KS3-Knock Warning

Clear LCD Display

The LCD screen shows the current and maximum knock readings. A bar graph gives a clear indication at a glance. 

This screen can be used as a clear knock gauge.

Phormula KS3-Knock Display

Easy Setup and Configuration

Simple to configure and highly accurate.

Phormula KS3-Knock Settings

The Phormula KS-3 Knock Detector actively filters and processes engine signals using a dedicated knock microprocessor. These signals are processed and displayed on a wide angle clear LCD display.

How does it work?

The KS-3 monitors engine knock levels and can be configured to alert the driver via a visual and audible warning. The KS-3 can be used as a hand-held device or permanently mounted to the dashboard and is configurable for knock frequencies between 6 and 9 kHz. The system includes high quality Bosch Wideband Knock Sensor, Sensor Plug, Shielded Signal Cable, Mounting Kit and Power Supply Cable.


The Phormula KS-3 Knock Detector has been designed to be easy to install, reliable and affordable. The KS-3 comes as a complete kit containing everything necessary for installation, including a high quality Bosch knock Sensor linked to the main unit via a shielded signal cable. Installation is very simple: Mount the sensor, connect the signal cable and connect the power cable.

What is Knock?

Knocking or detonation occurs when unburnt fuel in the combustion chamber explodes instead of burning in a controlled manner. When engine knock is occurring the pressure in the combustion chamber rises dramatically to levels that can destroy engine components in a few seconds.

What does engine knock sound like?

See our video clips demonstrating our products in action clearly detecting engine knock. Towards the end of the demonstration there is an audio sample of knock.


The KS-3 is very simple to configure. The most common question we are asked is “What frequency should I select?”. We now have an online calculator that will estimate the knock frequency for you. Use our Knock Calculator to estimate the knock frequency of your engine.

Why should I choose the KS-3 over other Knock Detection devices?

Our goal was to develop the most advanced knock detection system available. The KS-3 has taken three years of develop in conjunction with one of the UK leading tuning companies and is the result of many hours of dyno and track testing.


“We have been using Phormula products since their inception and have found nothing that comes close to their quality and functionality.”

Charlie Wright – Surrey Rolling Road

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