Used Split Second PSC1 Programmable Signal Calibrator. This is a laptop-programmable piggyback signal calibrator designed to adjust fuel mixture by modifying the primary load sensor signal (MAP, MAF, or similar 0–5V inputs) while working alongside the stock ECU.

It uses Split Second’s R4 software for full 3D mapping (typically RPM vs. load/sensor voltage) with fine resolution across hundreds of cells. This allows precise fuel calibration across the entire operating range rather than simple idle/WOT adjustments. Ideal for compensating for larger injectors, forced induction conversions, cams, exhaust, intake, or other engine modifications on both naturally aspirated and boosted applications.

Key features:

• Laptop programmable via Split Second R4 software (serial interface)

• 3D map tables for detailed fuel adjustment

• Compatible with a wide range of engines (1–12 cylinders, 2- or 4-stroke)

• Engine bay mountable

• Built-in protection against voltage spikes and reverse polarity

• Works as a signal modifier while retaining stock sensors and ECU programming

Condition: Used, in good working condition (tested for power-up and communication). Sold as-is. No software is included. Comes as pictured in the photos.

Perfect for tuners who want flexible, map-based fuel control without a full standalone ECU. Common applications include turbo/supercharger conversions, cam swaps, and sensor/injector upgrades on many domestic and import platforms.

Split Second PSC1 Programmable Signal Calibrator

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