Online shop: Engine management, sensors, parts
Rolling road tuning: Standalone ECU & Renault RS mapping

Phormula KS-3 knock (detonation) detection kit


The Phormula KS-3 is a powerful and innovative dash board mounted engine knock (detonation) detection and alert system.

9999999992 in stock (can be backordered)


The Phormula KS-3 is a powerful and innovative engine knock detection and alert system.
Engine knock or detonation can destroy an engine in a matter of seconds. The KS-3 can alert the driver to unsafe knock levels.

Optional twin sensor kit available for V6, V8 and Boxer engines

The KS-3 is probably the most advanced engine knock detection system on the market. The KS-3 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 audable warning. The KS-3 can be used as a hand-held device or permanently mounted to the dashboard. The KS-3 is configurable for 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 KS-3 has been designed to be easy to install, reliable and affordable. The KS-3 comes as a complete kit containing everything necessary for the installation. A high quality Bosch knock sensor is included and is linked to the main unit via a shielded signal cable. Installation is very simple: Mount the sensor, connnect the signal cable and connect the power cable.

What is engine knock ?
Knocking or detonation occurs when unburnt fuel in the combustion chamber explodes instead of burning in a controlled manner. When engine knock is occuring 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 ?
Watch the last of the 3 videos below. It gives you a sample of engine knock in an engine that has been pushed beyond it’s safe, knock-free threshold and shows how effective the KS-3 and KS-Pro devices are at detecting detonation.

The KS-3 is very simple to configure. The most common question we are asked is what frequency should I select. The frequency of knock is largely dependant on engine bore diamater. The following table is a good rule of thumb and should be adequate to set the KS-3:

65 mm — 8.8 KHz
70 mm — 8.2 KHz
75 mm — 7.6 KHz
80 mm — 7.5 KHz
85 mm — 6.7 KHz
90 mm — 6.4 KHz
95 mm — 6.0 KHz

Why should I use a KS-3 over other knock detection devices ?
Phormula’s goal was to develop the most advanced knock detection system available. The KS-3 has taken nearly three years of development in conjunction with one of the UK leading tuning companies. It is the result of many hours of dyno and track testing and has evolved into what we believe is the ultimate knock detection system available today.

A quick tour of the KS-3:

Configuring the KS-3:

Demonstration including the sound of knock:

Additional information

Weight 1000 g
Featured products