Split Collar 2.125 ID 8-Magnet

The Split Collar 2.125 ID 8-Magnet magnetic pickup collar from RACEPAK is a precision data-acquisition accessory engineered for high-performance engine diagnostics and real-time telemetry monitoring. Used extensively by motorsports professionals, automotive technicians, and engine builders, this magnetic collar collar captures crankshaft and wheel-speed data without invasive sensor installation. Its non-contact design eliminates calibration drift and mechanical wear, making it ideal for dyno testing, competition tuning, and engine development where accurate RPM and speed measurements are critical to performance optimization.

Constructed from durable aluminum and fitted with eight strategically positioned rare-earth magnets, the Split Collar 2.125 ID 8-Magnet housing accommodates a 2.125-inch inside diameter crankshaft or reluctor ring with precise magnetic field density. The split-collar design allows quick installation without full shaft removal, while the 0.375-inch width concentrates magnetic flux for reliable signal generation across wide RPM ranges. Eight magnets provide consistent tooth-pass detection and enhanced signal-to-noise ratio, delivering clean, stable output to RACEPAK's ECU and data-logging systems even in electromagnetically noisy engine bay environments.

Professional engine builders and dyno operators benefit most from the Split Collar 2.125 ID 8-Magnet when validating fuel maps, ignition timing, boost control, and transmission shift schedules on naturally aspirated and turbocharged engines. Installation requires a compatible RACEPAK pickup sensor positioned 0.100 to 0.150 inches from the collar face; no machining or permanent modifications to the engine are necessary. The compact 4 x 0.95 x 6.1-inch profile fits tight engine compartments, and the lightweight 0.24-pound construction adds negligible rotating mass, ensuring measurement accuracy without affecting engine performance during baseline or tuning runs.