Data Acquisition for the Challenger: AiM, Garmin Catalyst, and OBD Loggers
Recording lap data, GPS traces, and sensor channels helps you find time on track faster than feel alone.
Why Data Acquisition Matters
Lap times are the result — data shows you why. A data acquisition system records speed, GPS position, throttle position, braking points, and lateral G — giving you a trace you can analyze after each session.
Entry-Level: OBD-II Loggers
Harry's LapTimer + OBD dongle: Records speed, throttle, RPM, and GPS. Free app, pairs with cheap Bluetooth OBD adapters. Good starting point.
RaceCapture/Track: Dedicated logger, records OBD-II channels plus accelerometers. MoTeC-style traces at a fraction of the cost.
Mid-Range: Garmin Catalyst
The Garmin Catalyst is purpose-built for amateur track use. It records GPS-based lap times and shows you "optimal lap" overlays — combining your best sectors from multiple laps into a theoretical best.
Standout feature: The "event review" shows exactly where you lost time compared to your personal best. Intuitive enough that beginners extract value immediately.
Limitation: No analog sensor inputs — throttle, brake pressure, and steering angle require additional hardware.
Professional: AiM Solo 2 DL / MXS
AiM systems are the standard in club racing. The Solo 2 DL records GPS + OBD-II channels in one unit, while the MXS dash-logger replaces your cluster and adds inputs for thermocouples, pressure sensors, and more.
AiM Race Studio 3 software lets you overlay driver traces, compare braking points corner by corner, and track session-to-session improvement.
What Channels to Log on the Challenger
- RPM and gear position (via OBD)
- Throttle position percentage
- Vehicle speed
- GPS trace and lateral/longitudinal G
- Oil temp and coolant temp (heat soak awareness)
Getting Value From the Data
After each session, look at:
- Braking points — are you consistent? Are you braking earlier than needed?
- Throttle application — smooth ramp-up or abrupt? Abrupt = wheelspin on power-out
- Speed at track-out — low exit speed = too much speed carried into the corner
Data doesn't make you faster by itself — it focuses your practice on the right things.
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