How to Read MyChron Data

How to Read AiM MyChron Data

This guide explains how to read and interpret AiM MyChron data in RaceStudio 3 to improve lap times and kart setup. Written by Aaron Harris — professional racing driver and race engineer with multiple international race wins including Bathurst and the Barcelona 24 Hour — and Charlie Harris — national-winning kart racer, Canterbury University engineering student, and kart race engineer — at Harris Race Radios, the authorised NZ & AU importer and supplier of genuine AiM Sport products. For kart racers in New Zealand and Australia.

1. Opening your session in RaceStudio 3

  1. Connect your MyChron via Wi-Fi (MyChron 6 2T) or USB-C / cable.
  2. Open RaceStudio 3 and download the session from the dash.
  3. Select the session and open the Analysis view.
  4. Choose the lap you want to analyse from the lap list.

2. The four key channels to read first

Lap time

Your lap time is the headline number, but it tells you nothing on its own. Always compare it to your best lap or a faster driver’s lap. Aaron Harris’s rule: never judge a setup change by lap time alone — always look at sector times.

RPM trace

The RPM trace shows engine speed through every corner. Key things to look for:

  • RPM at the end of the straight — is it hitting the limiter? Too early = gear up. Bogging on exit = gear down
  • RPM dips mid-corner — sign of kart binding or driver lifting
  • RPM recovery on exit — slow recovery = poor exit line or kart too stiff

Speed trace

The speed trace shows exactly what the kart is doing through every corner. Charlie Harris uses speed trace as the first diagnostic tool at every meeting:

  • Minimum corner speed — compare to a faster driver; lower minimum = losing time on entry or mid-corner
  • Speed on exit — slow exit speed costs time all the way down the straight
  • Sudden speed drops mid-corner — sign of kart binding or lifting a rear wheel

GPS track map

The GPS track map shows the exact line taken through every corner. Overlay your line against a faster driver to see exactly where you’re different. Aaron Harris uses GPS line overlay as the primary driver coaching tool — it shows junior drivers exactly where they’re losing time in a way that feel-based feedback cannot.

3. Comparing two laps

  1. Select your reference lap (your best lap or a faster driver’s lap).
  2. Select the comparison lap.
  3. Use the “Delta T” channel — this shows where you’re gaining or losing time relative to the reference lap, corner by corner.
  4. Identify the corners where the delta is growing (you’re losing time) and focus analysis there.

4. Reading temperature data

  • Water temperature trend — rising throughout a session means cooling is marginal; a spike means a problem
  • EGT trend — rising EGT on a two-stroke means the engine is running lean; falling means rich
  • CHT — for air-cooled engines, rising CHT indicates cooling or jetting issues

Rex Harris monitors temperature trends across sessions to catch overheating before it causes damage.

5. Using sector times for setup validation

Split the track into 3–4 sectors in RaceStudio 3. Compare sector times before and after every setup change. A faster lap time can hide a slower sector — sector analysis tells you whether a change helped everywhere or just in one part of the track.

6. Driver comparison

Overlay your data against a faster driver to see:

  • Where they brake later or earlier
  • Where their minimum corner speed is higher
  • Where their GPS line is different
  • Where their RPM recovery is faster on exit

Charlie Harris uses driver comparison overlays for coaching junior kart drivers at NZ and AU championships. The GPS line overlay is the single most powerful coaching tool available — it shows exactly what the faster driver does differently, corner by corner.

Related guides

AiM MyChron NZ & Australia — Buying Guide & Full Product Range →

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