Know When Your Engine Is Knocking Before It Becomes Expensive

Detonation can destroy a high-performance engine quickly—and in many cases, you won't hear it from the driver's seat.

The Link ECU KnockLink G4 (G4KNL) is a compact knock warning system designed to give you an immediate visual indication when engine knock is detected.

Whether you're tuning a turbocharged street car, monitoring a high-compression naturally aspirated engine, or looking for another layer of protection on a race build, the KnockLink makes it easier to see what's happening inside the engine.

Real-Time Visual Knock Warning

The KnockLink uses an easy-to-read LED display to indicate engine knock activity.

Instead of trying to hear detonation over a loud exhaust, turbo, drivetrain noise, or dyno equipment, the KnockLink provides a clear visual warning that can alert you when abnormal combustion is occurring.

This makes it useful for both drivers and tuners.

Automatically Learns Your Engine's Noise

Every engine produces a different amount of mechanical noise.

The KnockLink G4 is designed to learn the normal background noise of the engine so it can distinguish normal operation from potential knock events.

Once correctly installed and configured, the system provides an easy visual reference for monitoring knock while driving or tuning.

Perfect for Performance Engines

The KnockLink G4 is especially useful on engines where ignition timing, boost, compression, or fuel quality can push the engine closer to the knock threshold.

Ideal for:

• Turbocharged engines
• Supercharged engines
• High-compression naturally aspirated builds
• Street performance cars
• Dyno tuning
• Drag racing
• Road racing
• Track cars
• Engine swaps
• Standalone ECU builds

Great Tool for Tuners

When you're tuning an engine, knock detection is critical.

The KnockLink gives you another tool for identifying potential detonation while making changes to:

• Ignition timing
• Boost pressure
• Air/fuel ratio
• Fuel type
• Intake air temperature compensation
• Load and RPM areas

Used alongside proper datalogging, wideband data, and professional tuning equipment, it can provide additional information when dialing in a performance calibration.

Compact Installation

The compact KnockLink display can be mounted where the driver or tuner can easily see it without taking up significant dashboard space.

This makes it suitable for everything from clean street builds to dedicated race cars.

Key Features

• Genuine Link ECU KnockLink G4
• Part number: G4KNL
• Real-time visual knock indication
• Multi-color LED warning display
• Automatically adapts to normal engine noise
• Compact design
• Easy-to-see warning indication
• Excellent for turbo and supercharged applications
• Useful for naturally aspirated high-performance engines
• Ideal for dyno tuning and track use
• Works independently of the engine ECU
• Suitable for a wide range of engine combinations

KnockLink G4 vs. KnockLink Kit

G4KNL is the KnockLink G4 unit itself.

If you also need a compatible knock sensor and wiring loom, consider the complete G4 KnockLink Kit (G4KNLK) instead.

This is important when ordering for a vehicle that does not already have the required compatible knock-sensor setup.

Don't Guess When It Comes to Knock

You can replace a sensor.

You can replace a tuning cable.

Replacing pistons, bearings, cylinder heads, or an entire engine is a different story.

The Link ECU KnockLink G4 (G4KNL) gives you a simple visual way to monitor one of the most damaging conditions a performance engine can experience.

See the knock. Make the correction. Protect the engine.

Important Note

The KnockLink is a monitoring tool and should not be treated as a substitute for proper ECU calibration, professional knock-monitoring equipment, or correctly configured ECU-based engine protection. Proper sensor selection, mounting, installation, and setup are critical for reliable knock detection.