The main screen area of WinTAX4 consists of an adaptable, multi-window layout environment engineered for rapid data scanning. All opened display modules are dynamically linked; scrolling through a timeline in one pane automatically updates the cursor position across all other active windows. Primary Analytical Windows
WinTax 4 is a premier telemetry and data analysis software used extensively in professional motorsport. Developed by Magneti Marelli, this powerful tool allows engineers, mechanics, and drivers to visualize, analyze, and interpret vehicle data to optimize performance and reliability.
Upon loading a file, WinTax 4 automatically detects laps based on GPS coordinates or a beacon signal.
If overlayed laps do not align properly on a distance scale, ensure that your track beacon settings are identical and that the main wheel circumference parameter matches the vehicle's actual setup. wintax 4 user manual
To extract data via a physical tether cable, your PC's Network Interface Card (NIC) must reside on the same network subnet as the onboard data logger.
Plot RPM against Throttle Position, color-coded by Lambda (air-fuel ratio).
© 2026 WinTax Software, Inc. All rights reserved. WinTax 4 is a registered trademark. IRS and state tax agency approvals subject to annual recertification. The main screen area of WinTAX4 consists of
Visualizes the vehicle's circuit trajectory using GPS or inertial data.
Exporting data is as simple as a right-click, and the software supports two-way communication with Matlab and Simulink for advanced modeling.
Many commands across these menus have associated keyboard shortcuts to speed up workflows. Developed by Magneti Marelli, this powerful tool allows
View telemetry as waveforms against time or distance. You can easily overlay laps to compare performance or use the "difference" mode to see exactly where time is being gained or lost.
Upon your first software launch, a pop-up window will output a hardware-locked .
The Wintax 4 is designed for efficient data collection. Here's how to collect data using the device: