Doc 26 - P3 and Qualifying Scrutineering

Technical Delegate's Report: 2025 Italian Grand Prix

Document 26

Date: 06 September 2025

Time: 19:15

This report details the technical checks performed before, during, and after the third free practice session (P3) and the qualifying session for the 2025 Italian Grand Prix.

Before the Third Free Practice Session:

• Digital Scan & CAD Comparison: A spare LHS front corner of car numbers 81 and 04 was digitally scanned. The scanned data was compared against the team's declared CAD drawings. These CAD drawings were also cross-referenced with previously submitted versions to ensure conformity with the 2025 Formula One Technical Regulations.

During the Third Free Practice Session:

Comprehensive checks were performed on all cars, including:

• Tyre Pressures: Starting pressures of tyres.
• Fuel System: Fuel pressure, fuel flow meter calibration checksum, instantaneous fuel mass flow, partial load fuel mass flow, and fuel temperature.
• Engine & Cooling: Logged pressure within the engine cooling system, engine high rev limit bands, plenum temperature, and exhaust fluid mass flow.
• Power Unit (PU) & Energy Recovery System (ERS):
  • IVT code and calibration checksums, IVT temperatures.
  • ES state of charge on-track limits, lap energy release and recovery limits.
  • MGU-K power limits, maximum MGU-K speed, maximum MGU-K torque, MGU-H speed.
  • MGU-K power model, ES power model.
• Torque System: Torque coordinator demands and torque control.
• Software: Torque sensor software version and calibration checks, SECU custom software versions.

After the Third Free Practice Session:

• Engine Oil Sample: An engine oil sample was taken from car number 63.

Before the Qualifying Practice Session:

• Fuel Samples: Fuel samples were taken from car numbers 87, 06, and 27.
• Engine Oil Samples: Engine oil samples were taken from car numbers 31 and 05.
• Gear Ratios: It was confirmed that the gear ratios used for the remainder of the competition conformed to those declared to the FIA technical delegate before the first competition of the 2025 Championship.

During the Qualifying Practice Session:

• Brake Discs: Thickness of brake discs was checked on car numbers 81, 04, 16, 44, 01, 22, 12, 18, 10, 43, 31, 87, 06, 30, 23, 55, 27, and 05.
• Weight & Distribution: Car numbers 81, 44, 22, 63, 10, 31, 87, 06, 30, 23, 55, and 27 were weighed, and their weight distribution was checked.
• Rear Wing: Uppermost rear wing element adjustable positions and minimum distance between adjacent rear wing sections were checked on car numbers 10, 87, 06, and 55.
• Tyre Pressures: Starting pressures of tyres for all cars.
• General Checks: Fuel pressure, engine cooling system pressure, engine high rev limit bands, fuel flow meter calibration checksums, instantaneous and partial load fuel mass flow, fuel and plenum temperatures, exhaust fluid mass flow.
• Power Unit (PU) & Energy Recovery System (ERS): IVT code and calibration checksums, IVT temperatures, ES state of charge on-track limits, lap energy release and recovery limits, MGU-K power limits, maximum MGU-K speed, maximum MGU-K torque, maximum MGU-H speed, MGU-K and ES power models.
• Torque System: Torque coordinator demands and torque control.
• Software & Electronics: Torque sensor software version and calibration checks, SECU custom software versions, PCU dash board display configuration (verified unchanged), Chassis FIA checksum.
• Brakes & Steering: Rear brakes pressure control, steering wheel.
• Tyres: Cold pressure on car numbers 81, 22, and 14. Tyres used by all drivers during sessions were checked.

After the Qualifying Practice Session:

• Weight: Car numbers 81, 04, 16, 44, 01, 22, 63, 12, 14, and 05 were weighed.
• Aerodynamic Components/Bodywork (Car numbers 44, 14, 05):
  • Floor Body (TR Article 3.5.1)
  • Floor Fences (TR Article 3.5.2)
  • Floor Edge Wing (TR Article 3.5.3)
  • Nose (TR Article 3.6.1)
  • Forward Chassis (TR Article 3.6.2)
  • Mid Chassis (TR Article 3.6.3)
  • Mirror Housing (TR Article 3.6.4)
  • Sidepod (TR Article 3.7.1)
  • Coke Panel (TR Article 3.7.2)
  • Engine Cover (TR Article 3.7.3)
  • Tail (TR Article 3.8.1)
  • Front Wing Profiles (TR Article 3.9.1)
  • Front Wing Endplate body (TR Article 3.9.2)
  • Front Wing Tip (TR Article 3.9.3)
  • Front Wing Diveplane (TR Article 3.9.4)
  • Front Wing Endplate (TR Article 3.9.5)
  • Rear Wing Profiles (TR Article 3.10.1)
  • Pylons (TR Article 3.10.2)
  • Rear Wing Beam (TR Article 3.10.3)
  • Rear Wing Endplate Body (TR Article 3.10.4)
  • Rear Wing Tip (TR Article 3.10.5)
  • Rear Wing Endplate (TR Article 3.10.7)
• Fuel Analysis:
  • Fuel samples were taken from car numbers 16 and 63.
  • All fuel samples were checked for density and analyzed by gas chromatography.
  • Results confirmed fuels were consistent with approved reference samples, and density changes were within permitted limits.
• Engine Oil Analysis:
  • An engine oil sample was taken from car number 16.
  • Engine oil samples were analyzed by FTIR spectroscopy and viscometry.
  • Results confirmed oils were consistent with approved reference engine oil samples.

SECU Software Versions Used During Qualifying:

Conclusion: All items checked were found to be in conformity with the 2025 FIA Formula One Technical Regulations.

Jo Bauer

The FIA Formula One Technical Delegate