# iRacing

## Connection Method

**Shared Memory** — DR Sim Manager reads telemetry directly from iRacing's shared memory interface at **360 Hz**. No setup or configuration is needed.

## Setup Steps

1. Install and launch **iRacing** as usual.
2. In DR Sim Manager, select **iRacing** from the Source list.
3. Click **Start Motion**.
4. Join a session and enter the track — telemetry begins automatically when your car is on track.

That's it. No plugins, no configuration files, no ports to set up.

## Available Telemetry

iRacing provides one of the most comprehensive and high-quality telemetry feeds of any sim:

* **Orientation**: Pitch, Roll, Yaw
* **Acceleration**: Full 3-axis at 360 Hz (lateral, longitudinal, vertical) — uses iRacing's high-frequency sub-sampled data for ultra-smooth motion
* **Velocity**: Full 3-axis local velocity at 360 Hz
* **Angular Velocity**: Pitch rate, Roll rate, Yaw rate at 360 Hz
* **Speed**: Vehicle speed
* **RPM**: Engine RPM
* **Gear**: Current gear
* **Suspension**: 4-wheel shock deflection and velocity (FL, FR, RL, RR)
* **Vehicle Name**: Detected automatically from the session

### Telemetry Quality: ★★★★★

iRacing's telemetry is the gold standard for sim racing motion platforms. The 360 Hz high-frequency data provides six sub-samples per physics frame, resulting in extremely smooth and responsive motion with minimal filtering needed.

## Recommended Starting Settings

Because iRacing's telemetry is so clean and high-frequency, you can typically run with less filtering:

* **Primary Cue Gain**: Start at 70–100%
* **Smoothing**: Low values work well (the 360 Hz data is already very smooth)
* **Washout**: Medium — adjust to taste based on your platform's travel

## Known Quirks

* **Telemetry only active on track**: Data is only sent while your car is on the track (the `IsOnTrack` flag must be true). You will not receive motion data in menus, replay mode, or while spectating.
* **High-frequency data**: iRacing sends acceleration, velocity, and angular velocity at 360 Hz (6 sub-samples per 60 Hz physics frame). DR Sim Manager automatically indexes into the correct sub-sample for the smoothest possible motion.
* **RPM threshold**: Engine RPM below 400 is reported as 0 to avoid noise when the engine is off.
* **Gear numbering**: Reverse is reported as gear 0 in iRacing; DR Sim Manager adjusts this by adding 1 (so Reverse = 0, Neutral = 1, First = 2, etc.).

## Troubleshooting

### No telemetry data appearing

* Make sure iRacing is running and you are **on track** in a session (practice, race, etc.). Sitting in menus or watching replays does not produce telemetry.
* Verify that no other application is exclusively locking iRacing's shared memory. Close other motion/telemetry apps and try again.
* Restart iRacing and DR Sim Manager.

### Motion feels jittery

* iRacing's high-frequency data is normally very smooth. Jitter usually indicates your motion platform's output is configured at a very high gain. Try reducing the Primary Cue gain.

### Vehicle name shows "Unknown"

* This can happen briefly when first connecting. It resolves once iRacing reports driver information. If it persists, rejoin the session.

### DR Sim Manager shows "connected" but no motion

* Confirm you are driving (not spectating). The telemetry feed pauses when you are not actively controlling the car.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.departedreality.com/dr-sim-manager/general/sources/iracing.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.