How to read your iRacing .ibt file (or let something read it for you)

Your .ibt files live in Documents → iRacing → telemetry. If the folder is empty, telemetry recording is off — enable it in iRacing under Options → Drive → Auto-record telemetry, then drive a session. From then on, every session drops a file there automatically, named by car, track, and date.

Which file to pick

The most recent file from a real driving session — practice or qualifying with eight or more laps is ideal. More laps means the analysis can tell a repeating habit from a single scrappy lap; a habit that shows up on lap after lap is worth fixing, a one-off is not. Short sessions still work, but the conclusions are necessarily more tentative.

Option one: read it yourself

Telemetry viewers will open the file and show you every channel as a graph. If you enjoy analysis for its own sake, this is a deep and rewarding rabbit hole: overlay your fastest laps, study brake traces, compare sector by sector. Budget real time for it — reading telemetry well is a skill measured in months, not evenings.

Option two: let something read it for you

Upload the file and get the conclusions without the graphs. PitDelta processes a session in about ninety seconds and returns named findings — which corners cost time, which habit causes it, what to change. A finding looks like this:

followed by an instruction you can apply on the very next lap:

Either way: close the loop

Whichever route you take, the file is only useful if it changes the next session. Find one thing, change one thing, drive again, and check the same corner in the next file. The .ibt folder filling up week after week is not a data hoard — it is the record of whether you are actually getting faster.