Haltech Driveshaft Split Collar 1.875″/ 47.63mm I.D. 8 Magnet Size: ID : 1.875″ / 47.63mm

High-Resolution Driveline Sensing: Driveshaft Split Collar 1.875″

For high-performance vehicles where space on the crank or front hubs is limited, the driveshaft becomes the ideal location for velocity sensing. The Haltech Driveshaft Split Collar with a 1.875″ (47.63mm) I.D. provides a robust and high-resolution trigger for engine management. This 8-magnet collar is designed for performance driveshafts and axle outputs, delivering an ultra-clean speed signal directly to your standalone ECU integration. This data is the backbone of advanced traction control and launch control, ensuring that your LS-swap or SR20DET build can put its power to the ground effectively.

Engineering Principles: Concentric Signal Integrity

A speed signal is only as accurate as its trigger. This Haltech collar is CNC-machined to ensure perfect concentricity, which is vital for maintaining a consistent air gap to the Hall-effect sensor. The 8 high-strength magnets are spaced at exactly 45 degrees, providing 8 pulses per revolution. This Analogue-to-Digital interface (speed frequency) provides the ECU with the resolution needed to calculate Ignition Timing trims based on traction levels. By using a split-collar design, Haltech ensures that the magnets remain permanently fixed under extreme RPM, unlike adhesive-backed solutions that can fail due to centripetal force. This provides the tuner with a deterministic speed input for fuel map calibration across all gears.

Operational Benefits: Traction Control for 1000+ HP

The primary application for this collar is in Traction Control. In a standalone ECU integration, the HPI can compare driveshaft speed to an un-driven wheel speed to identify exactly when spin starts. In high-boost 2JZ or RB26 applications, this slip data allows the ECU to manage closed-loop boost control with surgical precision. If the driveshaft accelerates faster than the vehicle ground speed, the ECU can instantly cut spark or drop boost to regain traction. This is a vital component for detonation protection through load management, preventing the high-RPM tyre spin that can cause sudden and dangerous lean-out conditions.

Fitment and Component Integration

This collar is designed to suit 1.875″ (47.63mm) driveshafts. The two-piece billet aluminum design is weatherproof and chemical resistant, ensuring reliability in the under-car environment. The outer diameter is 86mm and the width is 9.54mm. The kit includes the 5/32 Allen Key for installation, allowing for a fast and professional harness integration. It is compatible with all modern Haltech ECUs and industry-standard 3-wire Hall-effect sensors. For the best signal, it is recommended to mount the sensor with an air gap of 1.0mm, ensuring that even under driveline deflection, the magnets are always detected.

Technical Specifications

Summary & Includes

The Haltech 1.875″ Split Collar is the definitive solution for high-resolution driveline speed data. Includes: 1 x Driveshaft Split Collar 1.875″ I.D. 8 Magnet and 1 x 5/32 Allen Key. Note: Mandatory hardware for speed-based traction management on 1.875″ shafts.