Using Telemetry
Where everything is, and how to read what it shows you - from opening your first session to setting your lap against a team mate's.
Install and updates
- Download the installer from the Telemetry page and run it. It installs for your Windows account only - no admin password - and opens on your latest day.
- It is signed by Jamieson Enterprises Limited. If Windows shows "Windows protected your PC", click More info, check that publisher, then Run anyway.
- For the driver report, paste your licence under Settings › Report access....
It updates itself: each time it opens it looks for a newer version, downloads it in the background, and offers Restart to update. It never restarts on its own. Settings › Check for updates looks straight away.
Where sessions come from
iRacing saves every session in Documents\iRacing\telemetry, and that is where the app looks first. If nothing shows up, iRacing may not be recording: press Alt+L in the car, or set it to record every session.
Recordings kept anywhere else - a shared Google Drive the team saves into, a MyChron download folder - can be added under Settings › Folders.... Add as many as you like.
The bar across the top
- Sim | Track - sim racing on one side, a real kart with a MyChron on the other. Each keeps its own days, runs and setups.
- Sessions - a day at the track and every run in it.
- History - whether you are getting quicker, and every report the coach has written.
- Setups - every setting you have run on a car at a track, and the pace it gave.
- Settings - folders, names, report access, updates, and this guide.
Sessions
The app opens here, on your latest day with its newest run open.
- The day picker at the top shows the date, track and car. Step through days with the arrows, or open it to jump to one.
- The day's runs are down the left, with their best lap, how it compares with the run before, and what changed - down to which setup file was loaded.
- Find a session... lists every recording in your folders; search by track, car or file name, or Open file... for one kept elsewhere.
- A new recording landing while the app is open puts a bar across the top offering to open it.
Three tabs show the run you picked: Summary - best, best three, typical lap, consistency and On the table, the time in joining up your own best corners; Charts; and Whole day.
On the Summary, tap Better, Same or Worse after a run, then the corner that felt worst. Notes... above the charts is for what was changed and anything else worth remembering - the coach reads both.
Charts
Everything is plotted against distance round the lap, not time. The same corner is at the same place on every lap, so laps of different pace lie on top of each other and can be compared.
Choosing what to see
- Tick Channels on the left: speed, throttle, brake, steering, tyre temperatures and pressures, G-forces - and on an iRacing session, the suspension.
- Under Laps, tick show for each lap you want drawn.
- Pick one lap with the compare to circle. Everything is measured against it: it is drawn dashed, and it is the zero line on Time loss.
Reading the colours
- Green - the quickest of your laps on screen.
- Dashed white - the lap you are comparing to, when it isn't the green one.
- Purple - the optimal lap, when Show optimal lap is ticked: your best piece of every corner stitched together.
- Blue, pink, amber, teal - other sessions or team mates, one colour each.
Time loss
The chart at the top shows how far ahead or behind each lap is against the one you compare to, all the way round. Where a line climbs, that lap is losing time; where it drops, it is gaining. The steep stretches are where to look.
The map, and zooming in
Move the pointer along any chart and a dot follows on the map, and on every other chart. Click a corner on the map, or an S1, S2... button under it, to open that part of the lap. Or drag across any chart to pull a stretch out into its own window; drag again inside it to zoom closer, and Back (Alt+←) to step out.
Comparing laps
Two of your own: untick every lap but the two you want and set one as compare to. With only a few laps on screen they are drawn at full strength.
A team mate's: More › Compare with a team mate lists everyone else's runs at the track. Up to four at once, each in its own colour. The whole thing, step by step: compare with a team mate.
Suspension and dampers
On an iRacing session these appear under Suspension in the channel list:
- Ride height front / rear - how high each end sat off the road, in millimetres: the aero platform.
- Splitter height - on cars that have one. Near zero is touching the ground.
- Damper travel (LF, RF, LR, RR) - how far each damper is compressed; higher is more. Left against right shows roll, front against rear shows pitch.
- Damper speed - how fast each damper moves, in mm/s. Above zero is bump, below is rebound. The scale stops at ±300 mm/s, so a kerb runs off the edge - which still shows where it was.
Damper histograms
Dampers (beside Setup) draws a histogram per corner from the laps you have ticked: how much of the lap each damper spent at each speed. Amber is bump, blue rebound. The darker bars near the middle are slow movement under 25 mm/s - body roll and pitch, the low-speed clicks. The bright bars further out are kerbs and bumps - the high-speed clicks.
A histogram leaning hard one way, or a corner unlike its partner across the car, is the place to start. What to change depends on the car and on what the driver felt.
Corners and segments
The lap is split into segments - S1, S2 and so on - the same on every lap and every day at a track, so S5 always means the same corner.
- Segments shows every lap's time through every segment, the best through each picked out, with the map beside it.
- Opening one segment shows that slice of the lap: the charts, a close-up of the track with each lap's braking point (a dot) and where the throttle went back down (a ring), and the times through it. Purple there is the quickest lap through that segment.
The whole day
The Whole day tab lays every run side by side: pace, what was changed between each, how it felt, and the best through each corner run by run - green is the day's best through that corner, the numbers are seconds off it. Debrief the day... asks the coach to go through it all at once.
Setups
- Setups on the top bar: choose the Vehicle and Track to see every setting you have run there, run by run, with the pace each gave and the setup file loaded.
- Setup on a run: what the car was set to, what changed since last time here, and what it did on track - tyre temperatures, pressures and ride heights.
- On the Track side, Tyres and engines counts the distance on each set of tyres and the hours on each engine named on your setup sheets, and warns you past a limit you set.
History
- Progress - pick one of Your tracks for your best, typical and optimal lap from your first session there to your latest, and segment by segment where you have found time. Working on is what the coach last asked you to practise.
- Reports - every driver report you have had.
Driver report and coach
The coach reads a session and writes back in plain language: where the time went, what to work on, and one drill for next time - then checks how the drill went the time after.
- It needs your licence under Settings › Report access... - it says set beside it once done.
- Driver report (orange, above the charts) writes the full report in under a minute, and you can reply with questions.
- Ask the coach on the Summary gives a quick verdict on the run.
- More › Driver card... makes a picture for the driver's phone: three things to work on, a speed for each already driven, and the drill.
Setup advice is always options to test, never certainties. A change worth a tenth can't be told apart from laps that vary by three tenths, so it says what to check after a change rather than promising a lap time.
Karting with a MyChron
- Add the folder your MyChron downloads go into under Settings › Folders..., then flick the top bar to Track.
- A MyChron has no pedal sensors, so there is no throttle or brake chart - braking and pickup points come from speed instead. Suspension and Dampers are iRacing only.
- Logger... shows which sensors are fitted and which the app can read.
- The Summary adds Engine and gearing: top speed, peak revs, and revs per km/h - which on a single-speed kart is the gearing.
- In Find a session..., Team session... and Test day debrief... put several drivers' runs from one day together.
Settings
- Folders... - where your recordings are. Add a team's shared folder to compare with them.
- Tracks... and Vehicles... - a name typed into a logger by hand turns up several ways; join them here so they count as one.
- Report access... - your licence for the driver report.
- How to use - this guide, built into the app.
- Check for updates - your version, and whether there is a newer one.
Everything the app keeps is in Documents\RacerSense\. If something goes wrong, the crash.log in there usually says exactly what - send it to us.