
Introducing the all-new and fully redesigned PLEX KNOCK MONITOR® V3 – the quintessential knock detection tool for data-driven tuners and IC engine calibrators. With over 12 years of customer feedback and expertise in various internal combustion engines, we’ve developed a knock detection system that sets the bar for reliability, accuracy & performance. The V3 boasts high-fidelity audio, cutting-edge knock detection, full spectrum CAN BUS datalogging and in-depth analysis on the PC. This combination provides unparalleled accuracy and versatility that will take your tuning to the next level.
Availability: in-stock! | Price ex.VAT: from €1099
“It’s something that can destroy your engine in seconds… but how much do you really know about pre-ignition, knock, and super-knock”? On this episode of the the Tuned In podcast, Andre from the HP Academy has invited Ioannis Andrianakis (PLEX TUNING’s technical director & founder) to discuss through these terms, how his highly-regarded series of knock monitors work, and what one does and does not need to worry about when it comes to all things detonation.
The podcast covers the early days of PLEX, back in the 90s, when Ioannis was focused on customer ECU remaps and goes through all kinds of challenges he faced with the limited technologies and constraints of that decade. It then goes on with the framework and process of developing his own products and systems, primarily to compensate for the gaps in the market and then (best part), continues with a long, in-depth technical discussion on the art and science of knock management.
The listeners will gain a far better understanding of the causes, solutions and variations of knock as Andre and Ioannis delve into the deep end of the knowledge pool and get really nerdy an “all things engine knock”. A trully must-listen talk for anyone involved into performance tuning!
Produced by: Peter Kelly
Bonus: You can use “PLEX25” for 25% off the HPA Tuning Starter Package!
Building on the success of its predecessor and utilising a new future proof, high-performance electronics platform the new PLEX KNOCK MONITOR® V3 was designed from scratch with the aim of providing the most advanced and reliable knock detection possible. Our trusted customers have played a pivotal role in feeding us with usage insights and requirements that we have integrated into the development process.



The centerpiece of the new V3 release is the powerful PLEX Data Analsyis v2 software. Whether used for real-time data streaming or for post-analysis, our intuitive software provides invaluable insights to optimize engine performance and prevent destructive tuning.
- Customisable UI
- Easy File Comparison
- Fast Keyboard Shorcuts
- Advanced Audio Filters
- Smart tuning maps
Unlock the full potential of your V3 with PLEX Device Manager v2 software. Easily compose custom pages, calibrate knock threshold, and set-up your monitor to your specific preferences. Write and save multiple configuration files tailored to each engine’s unique characteristics. Gain complete control with unrestricted access to the device’s I/Os, CAN BUS, and knock settings
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Physical & Price | V2 | V3 BASIC | V3 HD | ||
Price ex. VAT | €799 - €950 | €1.099 - €1.179 | €1.299 - €1.399 | ||
Dimensions in mm (w/h/d) | 120/74/18 | 132/76/26 | 132/76/26 | ||
Weight | xxg | 250g | 250g | ||
Material | CNC Aluminium | CNC Aluminium | CNC Aluminium | ||
Display & LEDs | |||||
Size | 2.3" | 2.8" | 2.8" | ||
Resolution | 128x64 | 240x320 | 240x320 | ||
Brightness | <100cd/m2 | 900cd/m2 | 900cd/m2 | ||
Type | LCD | Color TFT IPS | Color TFT IPS | ||
Refresh Rate | 15Hz | 50Hz | 50Hz | ||
LED Lights | 2x fixed colour | 4x configurable RBG | 4x configurable RBG | ||
Connectivity | |||||
Connectors | JWPF | M8 Industrial | M8 Industrial | ||
Knock/Vibration sensor inputs | 1-2 | 2 | 2 | ||
Analog Inputs 0-5V | 1 | 2 (shared) | 2 (shared) | ||
Digital Inputs 0-5V | 0 | 2 (shared) | 2 (shared) | ||
Trigger Inputs | 1x digital | 2x HALL/Inductive | 2x HALL/Inductive | ||
Analog Outputs 0-5V | 2 | 2 | 2 | ||
Communications | |||||
CAN BUS | 1 | 1 | 1 | ||
Ethernet | - | - | yes | ||
USB | 1 (configuration) | 2 (logging &config.) | 2 (logging & config.) | ||
Internal Sensors | |||||
Device/Sensor Voltage Monitor | - | +12V supp./+5V sensor sup. | +12V supp./+5V sensor sup. | ||
Ambient Light Sensor | - | - | - | ||
Real-time Clock | - | with battery backup | with battery backup | ||
Device TEMP Sensor | - | yes | yes | ||
User Interface | |||||
# of Pages | fixed menu | up to 24 | up to 24 | ||
Custom Page Design | - | yes | yes | ||
Colour Themes | - | yes | yes | ||
Datalogging | |||||
Memory | - | ext. USB | ext. USB | ||
Logging Rate Max | - | 44Khz knock/vibration, 100Hz other data | 44Khz knock/vibration, 100Hz other data | ||
# Logged Channels | - | 64 | 256 | ||
Engine Log | yes | yes | yes | ||
Alarms Log | - | yes | yes | ||
Calculations | |||||
Knock Metrics | Int., Cnt, Thrh. (all per cylinder) | Int., Cnt, Evt, Thrh. (all per cyl.) | Int., Cnt, Evt, Thrh. (all per cyl.) | ||
Knock Frequency Analysis | - | real-time (per cylinder) | real-time (per cylinder) | ||
Gain per Cylinder | - | - | HD variant | ||
Gain per Sensor | yes | - | HD variant | ||
Knock Windowing | - | - | HD variant | ||
Real-time FFT | - | - | HD variant | ||
Math Channels | - | 4 | 8 | ||
Electrical Data | |||||
Supply Voltage Range | 9-30V DC | 9-30V DC | |||
Current Consumption | max. 0.3A at 12V | max. 2A at 12V | max. 2A at 12V | ||
What's In The Box | |||||
Cable Harness | yes | yes | yes | ||
Knock Sensor Connectors | yes | optional | optional | ||
Knock Sensors | yes | optional | optional | ||
USB Cable | yes | yes | yes | ||
Micro SD Memory Card (with USB adapter) | no | yes | yes | ||
Headphones /Ear Mufflers | no | no | no |
PRODUCT VARIANTS
PLEX-KM-V3-Basic
2x Knock Sensor Inputs, CAN BUS port, 2D knock threshold, USB datalogging, up to 64 data channels, engine position inputs for RPM
PLEX-KM-V3-Basic-WS
V3 Basic plus 2x Bosch Knock Sensors with connectors
PLEX-KM-V3-HD
V3 Basic plus: 3D knock threshold, gain per cylinder & sensor, Ethernet streaming, knock windowing, real-time FFT, up to 256 data channels, crank trigger patter signal decoding
PLEX-KM-V3-HD-WS
V3 HD plus 2x Bosch Sensors with Connectors
UPGRADES / OPTIONS
UPG-KMV3-HD
Option upgrade from BASIC version to HD Version
UPG-KMV3-KS
Set of 2 Bosch Knock Sensors with Connectors
- Device (HD or Basic)
- Full cable harness
- Bosch knock sensors (optional)
- DTM connectors with pins
- USB-C to USB cable
- MicroSD Card with Adapters
- Free analysis & streaming software
- Velcro tape for wire-holding
- High quality, rugged carry case
