GPS Speed Input Module Length: 300mm

Absolute Velocity Data: GPS Speed Input Module (300mm)

In high-performance applications, traditional mechanical or Hall-effect speed sensors can suffer from inaccuracies due to wheel slip, tyre expansion at high RPM, or gear ratio changes. The Haltech GPS Speed Input Module provides an absolute ground speed signal that is independent of the vehicle’s drivetrain. This module delivers a high-accuracy speed reference directly to your standalone ECU integration, which is foundational for precise traction control, launch control, and odometer functions. Featuring a 300mm cable length and high-speed satellite tracking, this module ensures that your fuel map calibration and safety strategies are based on the vehicle’s true velocity.

Engineering Principles: 10Hz Update and Anti-Drift Technology

The module features a high-sensitivity GPS receiver with a 10Hz update rate, meaning it provides 10 speed samples per second. This resolution is critical for the ECU to identify the onset of wheel spin in 2JZ or LS-swap drag cars. The module outputs a 0V to 12V Pulsed Output, effectively mimicking a digital Hall-effect sensor. This Analogue-to-Digital interface ensures compatibility with the ECU’s SPI (Standard Pulse Input) or DPI (Digital Pulse Input) channels. Furthermore, the unit incorporates Anti-GPS Drift technology and pulse compensation for tunnels, ensuring that the speed signal remains stable even in areas with temporary signal obstruction—a vital feature for both street driving and circuit racing.

Operational Benefits: Traction Control and Launch Management

Integrating GPS speed into a standalone ECU integration unlocks a higher tier of Traction Control System (TCS) logic. By comparing front-wheel speed (often mechanical) to GPS ground speed, the ECU can identify “true slip” even if the entire vehicle is losing traction. This allows for much finer control of power delivery during closed-loop boost control sessions. Additionally, the 5000 pulses per kilometer (ppk) calibration provides the high resolution needed for gear-based maps. This ensures that features like Boost-by-Gear operate flawlessly, as the ECU can accurately determine the current gear by comparing RPM to GPS velocity, regardless of clutch slip or differential changes.

Installation and Harness Integration

This module is a compact solution designed for easy harness integration. It features a 300mm cable and includes a matching male Deutsch DTM-3 connector and pins. The antenna should be mounted with a clear view of the sky, typically on the dashboard, roof, or rear parcel shelf. Because the module generates a 12V pulse, it can be wired directly to any available digital input on a Haltech Elite or Nexus ECU. It is a universal component that is highly recommended for vehicles where the factory speed sensor has been removed or where large diameter changes (e.g., drag slicks) make mechanical speed readings unreliable.

Technical Specifications

Summary & Includes

The GPS Speed Input Module is the ultimate reference for ground velocity. Includes: 1 x GPS Speed Input Module, 1 x GPS Antenna, and a matching male DTM-3 Connector with pins. Note: Essential for traction control in vehicles with significant wheel spin or modified gearing.