Haltech Driveshaft Split Collar 2.187″ 55.55mm I.D. 8 Magnet Size: ID : 2.187″ 55.55mm

Traction Authority: Driveshaft Split Collar 2.187″ (8 Magnet)

Achieving consistent launches and superior mid-track acceleration requires precise data on vehicle speed and wheel slip. The Haltech Driveshaft Split Collar is a specialized sensor integration platform designed to mount directly to your drivetrain. With an internal diameter of 2.187″ (55.55mm), this collar is engineered for high-performance driveshafts commonly found in LS-swap drag cars and high-horsepower 2JZ builds. By utilizing an 8-magnet trigger wheel, this component provides the high-resolution speed signal necessary for advanced traction control and launch control strategies within your standalone ECU integration.

Engineering Principles: 8-Pole Signal Resolution

The split collar works in conjunction with a Hall-effect sensor to generate a digital square wave signal. As the driveshaft rotates, the 8 magnets pass the sensor, providing the ECU with 8 pulses per revolution. This Analogue-to-Digital interface (regarding ground speed calculation) is significantly more accurate than using front-wheel ABS sensors, which are prone to “noise” and brake-induced error. In a standalone ECU integration, this 8-pole signal allows the ECU to detect minute changes in driveshaft acceleration, which is the first sign of tyre slip. The 55.55mm I.D. ensures a concentric and vibration-free fit on 2.187″ shafts, preventing timing scatter in the speed signal.

Operational Benefits for Drag and Circuit Racing

The primary benefit of the Haltech Split Collar is the enablement of Speed-Based Traction Control. In a fuel map calibration or boost strategy, the ECU can compare the engine RPM to the driveshaft speed to calculate real-time slip percentage. If the slip exceeds the target, the ECU can instantly retard Ignition Timing or drop boost via closed-loop boost control to regain traction. Furthermore, the collar is a vital tool for Launch Control, allowing the tuner to build a “Target Slip” map for the first 60 feet. The 8-magnet resolution ensures the ECU has enough data at low vehicle speeds to make corrective adjustments before the run is compromised.

Fitment and Dimensional Integration

This collar is designed to suit 2.187″ (55.55mm) driveshafts. It features a two-piece split design that allows for installation without removing the driveshaft from the vehicle, a major advantage for track-side maintenance. The collar has an outer diameter of 86mm and a width of 9.54mm, making it compact enough for tight transmission tunnels. During harness integration, the accompanying Hall sensor should be mounted with a 1.0mm to 1.5mm air gap to the magnets. The billet construction ensures that the magnets remain secure under extreme centripetal force and high-heat environments common in professional racing.

Technical Specifications

Summary & Includes

The Haltech 2.187″ Split Collar is the foundational hardware for professional traction management. Includes: 1 x Driveshaft Split Collar with 8 Magnets. Note: Requires a compatible Hall-effect sensor for operation. Always verify driveshaft diameter with a caliper before purchase.