FS25 Realistic 4×4 Traction System V1.7.0.0

FS25 Realistic 4×4 Traction System V1.7.0.0

Multiplayer is in development. The mod is playable but may contain bugs.

This mod adds a switchable 4×4 traction system to compatible vehicles, including tractors, trucks, harvesters and cars. It allows you to engage or disengage the front axle, toggle the differential lock and react to actual wheel slip.

Features

• Real rear-wheel slip detection, with automatic modes reacting to actual wheel-slip physics, not just speed.
• Four driving modes, assigned to each vehicle by default:
  • Manual, always in control.
  • Semi-automatic, engages with actual wheel slip while manual control is always available.
  • Automatic, using the same logic adjusted for vehicles with factory-fitted automatic 4WD, including CVT/IVT transmissions.
  • Intelligent, providing continuous, proportional engagement in the Fendt style without abrupt switching on or off.
• Native tyre-pressure simulation during engagement, with no dependency on any other mod.
• On-screen HUD with real-time status and adjustable position in the game Settings menu.
• Zero XML changes to any vehicle. The system integrates automatically into all compatible vehicles.

V1.7.0.0

• New in-game settings menu: Esc -> Settings -> General -> "4x4 Traction System". HUD position and style, engage 4WD with implement lowered, disengage in tight turns, engage when braking, road speed limit, GPS prediction strength, locked centre torque bias, tyre pressure by hand and diagnostic log.
• Settings are saved in modSettings/FS25_4x4TractionSystem.xml, kept for all savegames and when the mod is updated. No more editing files inside the zip.
• New minimalist HUD, optional by choosing Icon in the menu: the tractor seen from the side.
• Green wheel means a wheel with traction. The rear is always green; the front wheel and the drive shaft turn green when 4WD engages, and are grey in 2WD.
• Padlocks indicate diff locks: on the rear hub, rear; on the transfer box, centre; and on the front hub, front.
• A slipping wheel flashes green and red, with each axle shown independently. Both wheels flash with low field pressure at road speed.
• Tyre pressure is shown under each wheel, front and rear, in bar, on tractors with CTIS or pressure by hand.
• The shop picture of the tractor being driven is shown next to the icon and can be switched off.
• Text underneath shows 4X4 / 2X4, mode and active locks. Three sizes are available.
• Move the HUD, panel or icon, with the mouse: Ctrl+Shift+N, drag with the left button, then right click, Esc or Enter to finish. The camera stays still while moving. The key can be changed in the Controls menu.
• The new menu and icon texts are in English and Portuguese. Other languages show English for now. Translations are being worked on.

V1.6.0.0

• Fixed mod tractors whose center differential lists the REAR axle first in the XML. In 2WD, the torque went to the front axle and the rear axle ran free, while the rear diff lock had no effect and worked only with 4WD engaged. Front and rear are now detected from the real wheel positions. Thanks to fermer25 for the report and video.
• Locked center now really locks on tractors with much smaller front tyres, for example MTZ/Belarus, with front wheels turning 1.5x the rear. The rear could spin freely and 4WD seemed to do nothing. With the center locked, torque now goes to the axle that grips, up to 85% to the front when the rear spins. A wheel in the air counts as spinning. Switch off with centerLockBias = false.
• HUD: the reason no longer flickers between implement lowered and GPS prediction.
• New tyre pressure by hand on every tractor: Ctrl+Alt+I to inflate and Ctrl+Alt+O to deflate, in 10% steps between the field and the road pressure.
• Without CTIS, tyre pressure can be changed only with the tractor stopped, taking approximately 1.5 min to inflate and approximately 1 min to deflate, like with a compressor and gauge.
• With CTIS, including Fendt VarioGrip and John Deere 8R, tyre pressure can be changed while driving using the onboard compressor. Ctrl+Alt+P returns to automatic on Fendt or preset on 8R.
• An on-screen message shows the chosen pressure, front and rear, in bar. The setting is saved with the savegame and synced in multiplayer.
• John Deere 8R: real integrated CTIS with FIELD / ROAD presets using Ctrl+Alt+P, 0.8 -> 1.8 bar in approximately 1 min, and deflation in approximately 40 s.
• Tyres flatten visibly when the pressure goes down, like Variable Tire Pressure, with a bigger contact patch.
• With Soil & Draft Physics, traction prediction uses the real implement draft force, ASABE D497, the real rear-axle load with weight transfer included, and the real tyre grip on the current soil, Brixius. Tyre pressures per axle come from the real axle load. Lower pressure means more grip and less wheel sinkage.
• Compatible with MoreRealistic. Traction prediction uses MoreRealistic’s real implement draft force, also without Soil & Draft Physics.
• Compatible with Variable Working Depth through Soil & Draft Physics. The draft follows the depth set in VWD.
• Works together with Hydraulic Suspension System.
• Translations for all 25 game languages.
• Settings in DriveModeConfig.lua: manualTirePressure (true/false), manualInflateMs, manualDeflateMs and centerLockBias (true/false).

V1.5.0.0

• Differentials now really work, rebuilt on the drivetrain node exactly like the game creates them. In FS25, the locks previously had no effect.
• Separate FRONT, CENTER and REAR diff locks: Ctrl+Alt+K, Ctrl+Alt+J and Ctrl+Alt+L, plus quick cycle with Ctrl+K. All are rebindable.
• Locked center respects the real front-axle lead, tyre size ratio + 2.5%, so the rear wheels no longer spin while the front axle brakes the tractor.
• 2WD leaves the front axle free.
• CTIS tyre pressure per axle uses the real axle load and tyre load tables with Soil Draft Physics. The rolling radius reduction is realistically -3.5% instead of -15%, so there are no more flat tyres.
• CTIS is automatically disabled on tracked tractors.
• New translations: DE, FR, ES, IT, PL and RU, plus EN, PT and BR. Translations were made with google, so errors are expected.

TESTED TOGETHER, no conflicts:

• Precision Farming 1.5.1.0
• Soil Draft Physics, beta, optional. When installed, CTIS tyre pressure is calculated from the real axle load.
• Realistic Mechanical Systems (RMS) 0.10.0.0
• Realistic Weather 1.2.0.0
• Fendt 1000 Vario Series
• John Deere 8R Pack / 6R Large / Ripper 2100
• Case IH Magnum CVX
• Kubota M7
• JCB Fastrac 4000
• CLAAS Lexion 8000
• Real Three Point Attacher
• Remove Frontloader Axle Locking
• Vehicle Speed Sync
• DashboardLive
• Real Vehicle Cams
• Universal Autoload
• Maps: Riverbend Springs, Redstone County

NOT RECOMMENDED TOGETHER, they also change wheels and differentials:

• Mud System Physics
• REA Plus
• Tractor Terrain Dynamics
• Variable Tire Pressure
• EnhancedVehicle: turn off its differential and drive-mode functions if you use both.