Throttle Position Sensor Guide
AiM Throttle Position Sensor (TPS) Guide
This guide explains how the AiM Throttle Position Sensor works, what data it provides, and how to use TPS analysis with MyChron 5 and MyChron 6. This information is tailored for kart racers in New Zealand and Australia.
What the TPS sensor measures
The TPS sensor measures how far the throttle is opened, from 0% (closed) to 100% (fully open). This allows you to analyse:
- Throttle application timing
- Driver smoothness
- Corner exit technique
- Engine response and carburetion
- Consistency lap‑to‑lap
Why TPS data matters
TPS data is one of the best indicators of driver performance. It shows:
- How early the driver gets back on the throttle
- Whether throttle application is smooth or aggressive
- If the driver is hesitating on corner exit
- Whether the kart is stable enough to accept throttle
Ideal throttle behaviour
A good TPS trace should show:
- Clean initial application — no hesitation
- Smooth ramp‑up — progressive throttle
- Consistent full‑throttle zones — repeatable driving
- No oscillation — stable kart on exit
How to read TPS data
In AiM RaceStudio 3, TPS appears as a percentage‑based graph. Look for:
- Throttle pickup point: where the driver first applies throttle
- Ramp rate: how quickly the throttle opens
- Full‑throttle duration: time spent at 100%
- Throttle modulation: adjustments mid‑corner
Common TPS issues and symptoms
| Symptom | Likely Cause | Fix |
|---|---|---|
| Hesitation on exit | Driver uncertainty or kart oversteer | Improve rear grip or coaching |
| Slow throttle ramp | Kart unstable or poor line | Adjust setup or refine driving |
| Oscillating throttle | Driver correcting oversteer | Increase rear stability |
| No 100% throttle | Driver not fully opening throttle | Coaching or pedal adjustment |
Using TPS for driver coaching
TPS is extremely effective for coaching junior and senior drivers. Compare:
- Throttle pickup timing
- Throttle smoothness
- Exit speed correlation
- Consistency across laps
Faster drivers typically apply throttle earlier and more confidently.
Using TPS for kart setup
TPS data can also reveal setup issues:
- Late throttle: kart pushing (understeer)
- Modulated throttle: kart loose (oversteer)
- Slow ramp: rear end unstable
Maintenance tips
- Ensure TPS linkage moves freely
- Check calibration in RaceStudio
- Inspect wiring for heat or vibration damage
- Verify full‑throttle position reaches 100%