RacePulse Free Le Mans Ultimate Overlay

Free Le Mans Ultimate Overlay

Lightweight telemetry overlay for Le Mans Ultimate with automatic shared memory detection, 12 customizable widgets, and zero configuration.

Free Telemetry Overlay for Le Mans Ultimate

RacePulse is a free telemetry overlay for Le Mans Ultimate. It reads LMU’s built-in shared memory interface — the official Studio 397 API that ships with the game. No plugins to install, no web dashboards, no configuration files.

Le Mans Ultimate ships with an official shared memory interface that exposes the sim engine’s physics, scoring, and vehicle data. RacePulse reads this data at up to 50Hz for physics and 5Hz for scoring, giving you real-time overlays with virtually zero setup.

Setup

  1. Download RacePulse.exe from the Releases page and run it (no installation needed)
  2. In LMU, go to Settings > Gameplay and turn Enable Plugins on
  3. Load into a session (practice, qualifying, or race)
  4. RacePulse automatically detects the shared memory and begins streaming telemetry

That’s the whole setup. RacePulse reads the shared memory interface built into Le Mans Ultimate itself, so there is no plugin DLL to download or install.

Troubleshooting: if RacePulse reports “failed to open LMU shared memory,” check that Settings > Gameplay > Enable Plugins is on and that you’re loaded into a session (not sitting in the main menu). On very old LMU versions that predate the built-in interface, RacePulse falls back to TheIronWolf’s rF2 Shared Memory Map plugin if it’s installed — updating the game is the simpler fix.

Available Widgets for Le Mans Ultimate

LMU supports 11 of the 12 RacePulse widgets:

Core Widgets

  • Speed — Live speed in km/h or mph
  • Gear — Large gear indicator for peripheral visibility
  • RPM — Horizontal bar with redline indicator
  • Lap Time — Current lap, last lap, and personal best
  • Delta — Real-time delta to best lap using sector split comparison
  • Inputs — Throttle, brake, and clutch as vertical bars
  • Fuel — Fuel remaining with estimated laps of fuel
  • G-Force — 2D lateral and longitudinal G-force visualization

Advanced Widgets

  • Telemetry Core — Combined display with rev lights, gear, RPM, speed, position, track temperature, elapsed time, and lap count
  • Inputs Telemetry — Scrolling input graph with pedal bars, optional steering wheel, gear, and speed
  • Flat Track Map — Horizontal bar showing all cars on track with class-colored markers and your position highlighted

Not Available

  • Relative — Not available for LMU (iRacing exclusive, requires iRating and license class data)

LMU-Specific Telemetry

RacePulse captures data specific to the rFactor 2 / LMU engine:

  • ERS Battery level (for hybrid prototypes)
  • Boost Torque from hybrid systems
  • Turbo Boost pressure
  • Competitor gaps — delta to leader and delta to car ahead from scoring data
  • Multi-class support — class positions and class-colored track map markers

The Delta widget uses a multi-tier approach for LMU: sector split comparisons after sector boundaries for accuracy, and proportional estimation during the first sector for real-time feedback.

Dual-Rate Telemetry

LMU’s shared memory carries two streams updated at different rates:

  • Telemetry (~50Hz) — Per-vehicle physics data including speed, G-forces, tyre data, fuel, inputs, engine data
  • Scoring (~5Hz) — Session information, standings, gaps, lap times, sector times, pit status

RacePulse reads both and merges the data into a unified stream. The higher-frequency telemetry provides smooth animations for speed, RPM, and input widgets, while scoring provides accurate timing and position data.

Customization

Every widget is independently configurable:

  • Metric or imperial units
  • Toggle individual display elements
  • Configurable frame rate (60, 30, or 15 FPS)
  • Drag-to-reposition in Edit Mode
  • Persistent settings across sessions

Why RacePulse for Le Mans Ultimate

  • Free — No subscription, no paid tier
  • Single executable — 21MB .exe, no installer required
  • One-time setup — Turn on Enable Plugins in LMU once, then forget about it
  • Endurance-ready — Fuel estimation and multi-class track map for long races
  • Multi-sim — Same app works with iRacing, ACC, Assetto Corsa, F1 25, and F1 24

Download RacePulse and set up your Le Mans Ultimate overlays. View all widgets on the features page or check the changelog for what’s new.