PitΔDelta
// setup

Turn telemetry on for good

iRacing records telemetry only while you hold Alt+L, and forgets it when the sim closes. There is no menu setting. The permanent switch is one line in Documents\iRacing\app.ini - this page sets it for you, on your own PC.

By Vidmantas Sakalys·Updated September 2026

Close iRacing first. The sim rewrites app.ini when it exits, so a change made while it is running is lost.

Documents › iRacing › app.ini. The file is edited on your PC and is never uploaded.

Paste it into the File name box and press Enter - or browse to it: %USERPROFILE%\Documents\iRacing\app.ini
by hand
  1. Close iRacing.
  2. Open Documents\iRacing\app.ini in Notepad.
  3. Find the line irsdkAutoLogDisk=0 (under [Misc] in current builds) and make it =1. Leave irsdkLimitFileSize at 0 - a 100 MB cap cuts long sessions short.
  4. Save, start iRacing, drive. Your .ibt lands in Documents\iRacing\telemetry.
Recording on. Now drive.

Drop the most recent .ibt on the home page after your session.

Analyse a session

who built this

Vidmantas Sakalys at the Monza pit straight, September 2023
Monza, September 2023

Vidmantas SakalysFounder, PitDelta

I'm Vidmantas Sakalys. PitDelta is me — one hardware engineer in Vilnius, building it since February 2026. I'm an engineer, not a quick driver, so PitDelta doesn't hand you my opinion: it measures your own laps and tells you where the time went. Every number is computed from your telemetry, not written by a model. Weekends I'm usually under a '78 Lincoln. I answer every support email myself.

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