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2025 Season 4 Update (#16)
* Commit updates from 2025 Season 4 patch * Update readme
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‎README.md‎

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**iracing-sdk-js** provides data access (live telemetry and session info) and most of the available commands. You can find some usage examples in the [examples](https://github.com/friss/iracing-sdk-js/tree/main/examples) directory, and there are some [data samples](https://github.com/friss/iracing-sdk-js/tree/main/sample-data) too.
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Latest tested iRacing version: *2025 Season 4*
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## Installing
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Make sure you are running [Node.js](https://nodejs.org/) v21 x64 or later. (Currently requires Node 21 for latest node test runner implementation, but should work with Node 20 too.)
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`yarn add iracing-sdk-js --save`
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## API documentation
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<a name="module_irsdk"></a>
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iracing.playbackControls.searchFrame(1, 'current') // go to 1 frame forward
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```
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## Development
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To develop `iracing-sdk-js` itself, you need working working installation of [node-gyp](https://github.com/nodejs/node-gyp#on-windows).
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Released under the [MIT License](https://github.com/friss/iracing-sdk-js/blob/main/LICENSE.md).
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## Credits
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Originally based on [node-irsdk](https://github.com/apihlaja/node-irsdk) by [apihlaja](https://github.com/apihlaja).
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‎doc/README.hbs‎

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**iracing-sdk-js** provides data access (live telemetry and session info) and most of the available commands. You can find some usage examples in the [examples](https://github.com/friss/iracing-sdk-js/tree/main/examples) directory, and there are some [data samples](https://github.com/friss/iracing-sdk-js/tree/main/sample-data) too.
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Latest tested iRacing version: *2025 Season 4*
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## Installing
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Make sure you are running [Node.js](https://nodejs.org/) v21 x64 or later. (Currently requires Node 21 for latest node test runner implementation, but should work with Node 20 too.)
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`yarn add iracing-sdk-js --save`
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## API documentation
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{{>main}}
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## Development
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To develop `iracing-sdk-js` itself, you need working working installation of [node-gyp](https://github.com/nodejs/node-gyp#on-windows).
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Released under the [MIT License](https://github.com/friss/iracing-sdk-js/blob/main/LICENSE.md).
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## Credits
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Originally based on [node-irsdk](https://github.com/apihlaja/node-irsdk) by [apihlaja](https://github.com/apihlaja).
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‎sample-data/sessioninfo.json‎

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{
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"timestamp": "2025-08-05T02:18:40.795Z",
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"timestamp": "2025-09-17T22:39:38.501Z",
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"data": {
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"WeekendInfo": {
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"TrackName": "virginia 2022 full",
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"TrackDirection": "neutral",
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"TrackWeatherType": "Realistic",
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"TrackSkies": "Dynamic",
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"TrackSurfaceTemp": "26.26 C",
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"TrackSurfaceTemp": "23.49 C",
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"TrackSurfaceTempCrew": "22.22 C",
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"TrackAirTemp": "20.26 C",
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"TrackAirPressure": "29.01 Hg",
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"TrackAirTemp": "20.49 C",
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"TrackAirPressure": "29.14 Hg",
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"TrackAirDensity": "1.16 kg/m^3",
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"TrackWindVel": "7.35 m/s",
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"TrackWindDir": "3.86 rad",
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"TrackRelativeHumidity": "94 %",
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"TrackWindVel": "4.80 m/s",
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"TrackWindDir": "3.26 rad",
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"TrackRelativeHumidity": "97 %",
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"TrackFogLevel": "0 %",
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"TrackPrecipitation": "6 %",
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"TrackPrecipitation": "58 %",
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"TrackCleanup": 0,
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"TrackDynamicTrack": 1,
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"TrackVersion": "2025.06.18.02",
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"TrackVersion": "2025.09.05.02",
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"SeriesID": 0,
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"SeasonID": 0,
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"SessionID": 0,
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"HeatRacing": 0,
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"BuildType": "Release",
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"BuildTarget": "Members",
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"BuildVersion": "2025.07.25.02",
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"BuildVersion": "2025.09.12.01",
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"RaceFarm": null,
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"WeekendOptions": {
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"NumStarters": 0,
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"GreenWhiteCheckeredLimit": 0
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},
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"TelemetryOptions": {
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"TelemetryDiskFile": "C /Users/friss/Documents/iRacing/telemetry/chevyvettez06rgt3_virginia 2022 full 2025-08-04 22-18-16.ibt"
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"TelemetryDiskFile": "C /Users/friss/Documents/iRacing/telemetry/chevyvettez06rgt3_virginia 2022 full 2025-09-17 18-39-18.ibt"
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}
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},
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"SessionInfo": {
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"SessionTime": "unlimited",
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"SessionNumLapsToAvg": 0,
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"SessionType": "Offline Testing",
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"SessionTrackRubberState": "slight usage",
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"SessionTrackRubberState": "moderately low usage",
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"SessionName": "TESTING",
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"SessionSubType": null,
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"SessionSkipped": 0,
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"Radios": [
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{
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"RadioNum": 0,
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"HopCount": 1,
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"HopCount": 2,
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"NumFrequencies": 6,
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"TunedToFrequencyNum": 0,
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"ScanningIsOn": 1,
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"DriverCarIdx": 0,
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"DriverUserID": 697587,
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"PaceCarIdx": -1,
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"DriverIsAdmin": 1,
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"DriverHeadPosX": -0.105,
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"DriverHeadPosY": 0.325,
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"DriverHeadPosZ": 0.535,
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"DriverCarSLShiftRPM": 7700,
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"DriverCarSLLastRPM": 7600,
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"DriverCarSLBlinkRPM": 7950,
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"DriverCarVersion": "2025.06.27.02",
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"DriverCarVersion": "2025.09.08.01",
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"DriverPitTrkPct": 0.990978,
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"DriverCarEstLapTime": 103.1748,
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"DriverCarEstLapTime": 113.4305,
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"DriverSetupName": "baseline.sto",
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"DriverSetupIsModified": 0,
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"DriverSetupLoadTypeName": "baseline",
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"CarClassPowerAdjust": "0.000 %",
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"CarClassDryTireSetLimit": "0 %",
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"CarClassColor": 16777215,
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"CarClassEstLapTime": 103.1748,
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"CarClassEstLapTime": 113.4305,
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"IRating": 1,
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"LicLevel": 1,
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"LicSubLevel": 1,
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"TreadRemaining": "100%, 100%, 100%"
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},
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"AeroBalanceCalc": {
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"FrontRhAtSpeed": "45 mm",
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"RearRhAtSpeed": "53 mm",
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"FrontRhAtSpeed": "41 mm",
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"RearRhAtSpeed": "47 mm",
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"RearWingAngle": "9.5 degrees",
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"FrontDownforce": "38.7%"
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"FrontDownforce": "39.6%"
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}
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},
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"Chassis": {
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"FrontBrakes": {
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"ArbBlades": 3,
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"TotalToeIn": "-3.1 mm",
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"ArbBlades": 5,
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"TotalToeIn": "-3.0 mm",
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"BrakePedalRatio": 4.67,
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"BrakePads": "Medium friction",
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"FWtdist": "44.3%",
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"CenterFrontSplitterHeight": "50.8 mm"
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"CenterFrontSplitterHeight": "52.3 mm"
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},
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"LeftFront": {
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"CornerWeight": "3161 N",
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"RideHeight": "53.0 mm",
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"BumpRubberGap": "11 mm",
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"SpringRate": "105 N/mm",
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"CornerWeight": "3163 N",
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"RideHeight": "51.0 mm",
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"BumpRubberGap": "15 mm",
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"SpringRate": "120 N/mm",
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"Camber": "-4.0 deg"
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},
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"LeftRear": {
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"CornerWeight": "3973 N",
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"RideHeight": "69.0 mm",
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"BumpRubberGap": "53 mm",
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"SpringRate": "200 N/mm",
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"CornerWeight": "3972 N",
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"RideHeight": "58.0 mm",
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"BumpRubberGap": "40 mm",
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"SpringRate": "325 N/mm",
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"Camber": "-3.3 deg",
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"ToeIn": "+1.6 mm"
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"ToeIn": "+1.5 mm"
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},
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"Rear": {
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"FuelLevel": "52.0 L",
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"ArbBlades": 1,
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"ArbBlades": 2,
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"RearWingAngle": "9.5 degrees"
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},
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"InCarAdjustments": {
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"CrossWeight": "50.0%"
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"RightFront": {
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"CornerWeight": "3161 N",
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"RideHeight": "53.0 mm",
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"BumpRubberGap": "11 mm",
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"SpringRate": "105 N/mm",
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"CornerWeight": "3163 N",
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"RideHeight": "51.0 mm",
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"BumpRubberGap": "15 mm",
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"SpringRate": "120 N/mm",
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"Camber": "-4.0 deg"
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},
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"RightRear": {
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"CornerWeight": "3973 N",
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"RideHeight": "69.0 mm",
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"BumpRubberGap": "53 mm",
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"SpringRate": "200 N/mm",
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"CornerWeight": "3972 N",
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"RideHeight": "58.0 mm",
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"BumpRubberGap": "40 mm",
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"SpringRate": "325 N/mm",
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"Camber": "-3.3 deg",
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"ToeIn": "+1.6 mm"
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"ToeIn": "+1.5 mm"
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},
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"GearsDifferential": {
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"FrictionFaces": 8,
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"DiffPreload": "110 Nm"
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"DiffPreload": "100 Nm"
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"Dampers": {

‎sample-data/telemetry-desc.json‎

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"CpuUsageFG": {
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"desc": "Percent of available tim fg thread took with a 1 sec avg",
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"desc": "Percent of available time fg thread took with a 1 sec avg",
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"unit": "%",
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"count": 1,
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"type": "float"
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"GpuUsage": {
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"desc": "Percent of available tim gpu took with a 1 sec avg",
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"desc": "Percent of available time gpu took with a 1 sec avg",
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"unit": "%",
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"CpuUsageBG": {
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"desc": "Percent of available tim bg thread took with a 1 sec avg",
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"desc": "Percent of available time bg thread took with a 1 sec avg",
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"unit": "%",
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"count": 1,
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"type": "float"
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"count": 1,
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"type": "float"
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"IsGarageVisible": {
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"name": "IsGarageVisible",
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"desc": "1=Garage screen is visible",
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"unit": "",
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"count": 1,
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"type": "bool"
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},
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"ReplayPlaySpeed": {
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"IsGarageVisible": {
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"name": "IsGarageVisible",
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"desc": "1=Garage screen is visible",
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"unit": "",
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"count": 1,
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"type": "bool"
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},
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"SteeringWheelTorque_ST": {
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"name": "SteeringWheelTorque_ST",
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"desc": "Output torque on steering shaft at 360 Hz",

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