How to use telemetry data to improve lap times

In the high-stakes world of endurance racing, where milliseconds define victories and tire degradation dictates strategy, raw talent alone is no longer sufficient. Modern motorsport has evolved into a precision science where the car is an extension of the driver, but the true brain of the operation often resides within the data streams flowing from the vehicle. For a professional racer like Nicki Thiim, harnessing telemetry is not merely about reviewing numbers after a session; it is about actively using real-time feedback to refine technique, optimize line selection, and push physical limits safely. This article explores the practical application of telemetry data to systematically improve lap times, turning complex digital streams into actionable driving insights. ## Decoding the Digital Feedback Loop Before a single lap is driven, the foundation of improvement lies in understanding what the data actually represents. Telemetry packages in endurance racing are comprehensive, capturing engine load, throttle position, brake pressure, steering angle, lateral G-forces, and roll angles. The challenge for a driver is to stop looking at the dashboard as a collection of gauges and start viewing it as a mirror reflecting the physical connection between the feet, hands, and seat. When a driver feels the car vibrating at the limit, telemetry can quantify exactly where that limit is on the track map. By correlating subjective feeling with objective numbers, a driver can identify inconsistencies that feel vague on a lap but are glaringly obvious in a graph. This feedback loop accelerates the learning curve, allowing for rapid correction of habits before they become ingrained. ## Identifying the Slow Section Through Data Visualization One of the most immediate benefits of telemetry is the ability to isolate the specific segments of a lap where time is being lost. Many drivers struggle to pinpoint exactly where a lap time increases, especially in long endurance stints where fatigue sets in. By overlaying lap time data onto the track map, a driver can visually identify "red zones" where the car is underperforming. This could be a specific corner where the apex is being missed, a braking zone where the pedal is not fully depressed, or a section where the throttle is being applied too gradually. Once these inefficiencies are marked on the track, they become the primary targets for the next training session. The goal is to reduce the time spent in these inefficient zones without sacrificing stability, effectively shaving seconds off the total lap time through precise line optimization. ## Mastering Braking Points and Corner Entry Angles Braking points are critical in endurance racing because every fraction of a second lost in the first sector of a corner compounds over 200 laps. Telemetry provides a clear record of brake pedal depth and duration, showing exactly when the driver initiates braking and how long they hold it. A common mistake is braking too late, which reduces the entry speed to the corner, forcing the driver to fight for the apex and potentially oversteer. Conversely, braking too early can rob the driver of momentum, requiring a rushed application of the throttle later. Using data, a driver can pinpoint the ideal braking point that maximizes the angle of entry into the corner. This involves finding the balance where the car is stable enough to carry high speed through the apex but not so fast that the rear end becomes unpredictable. By consistently hitting these optimized braking points, lap times improve as the car becomes faster through the corner rather than slower due to defensive driving. ### Analyzing Exit Trajectories for Maximum Acceleration The second half of a corner entry is often where the most significant gains in speed can be made, and this is where the data becomes even more specific. It is not enough to simply enter a corner fast; the driver must exit at the highest possible speed to ensure they are ready to brake again for the next turn. Telemetry can track the steering angle and lateral G-forces during the exit phase, revealing whether the driver is under-rotating (leaving the corner too straight) or over-rotating (heading toward the inside of the next corner). By studying these patterns, a driver can learn to smooth out their exit trajectory, ensuring the car is perfectly aligned for the next braking zone. This continuous optimization of the entire corner profile, from initial brake to full throttle, is the essence of high-level endurance driving and directly correlates to lower lap times. To truly master the exit phase, a driver must adhere to a structured approach: 1. Monitor the steering angle sensor to detect early entry into the next corner. 2. Check lateral G-force peaks to ensure the car is not carrying too much speed. 3. Verify throttle application timing to prevent premature acceleration. 4. Assess roll angles to confirm weight transfer is optimal for traction. 5. Review the trajectory line against the ideal path on the map. ## Implementing Real-World Adjustments During a Session Finally, the true power of telemetry is revealed when it is used dynamically during a session, not just in post-session analysis. With modern data recording systems, drivers can often trigger specific events or monitor key metrics in real-time, allowing for immediate adjustments to their driving style. If a driver notices that their engine RPM is spiking excessively due to a poor throttle modulation, they can correct the habit on the fly. If the car is losing grip on a specific patch of the track, the data can alert the driver to reduce steering input or smooth out body movements. This real-time application of data helps build muscle memory for the perfect line, ensuring that the improved technique becomes automatic over time. By consistently applying these data-driven insights, a driver can systematically eliminate inefficiencies, refine their rhythm, and ultimately achieve lower, more consistent lap times. ## Related reading - [Beyond the Hype: Engineering the Ultimate Power Unit](/blog/1000hp-engine-build-from-world-records-to-yours-for-free) - [Igniting Potential: The Engine Behind Endurance Success](/blog/170-engine-building-tuning-training-the-next-gen-podcast) - [Beyond the Cockpit: The Evolution of Human-AI Collaboration in Endurance Racing](/blog/autonomous-safety-drivers-operators) - [Igniting the Engine: The Art of Pre-Race Warm-Up](/blog/best-practices-for-pre-race-warm-up-routines) - [Driving For Kindness: The Impact of the CAT Charity Smiles 2025 Fundraising Event](/blog/cat-charity-smiles-2025-pot-smash-raises-2075-for-uk-charities)