Realistic 4×4 Traction System V2.0.0.1

Multiplayer is still in development, so bugs can show up. You can already play the mod.

You get a switchable 4×4 traction system for compatible tractors, trucks, harvesters and cars. It handles front-axle engagement, differential locks and wheel-slip-based operation, giving you more to work with when driving or building your setup.

Features

• The rear-wheel slip detection is real. Automatic modes react to actual wheel-slip physics, not merely to speed.
• Each vehicle starts with four driving modes assigned:
  • Manual, so you stay in control all the time.
  • Semi-automatic, which engages when the wheels really slip, while manual control is still available.
  • Automatic, using that same logic with adjustments for vehicles that have factory-fitted automatic 4WD and CVT/IVT transmissions.
  • Intelligent, using continuous proportional engagement in the Fendt style instead of suddenly switching on or off.
• Tyre-pressure simulation is built in during engagement, and it does not depend on another mod.
• The on-screen HUD gives you the status in real time. You can move it in the game Settings menu.
• You do not need to edit any vehicle XML. The system fits itself into every compatible vehicle.

V2.0.0.1

• The repeating Lua log error FourWDTractionSystem.lua:2518: invalid argument #3 to 'format' is fixed for vehicles with permanent 4×4 or no 4×4 speed limit. This includes 6×4 trucks, wheel loaders and articulated tractors.

V2.0.0.0

• All drivable vehicles are supported now, apart from trains, boats and motorbikes.
• The system identifies a vehicle through its shop category and its real driveline:
  • Tractors: selectable 4×4, just as before.
  • Articulated and 4-track tractors, wheel loaders and telehandlers: permanent 4×4, with locks only.
  • 6×4 trucks: lockable inter-axle differential and locks.
  • AWD trucks: selectable front drive.
  • 4×2 trucks: rear lock.
  • Cars, pick-ups and UTVs: part-time 4×4 that engages while you are moving.
  • Combines and self-propelled vehicles: rear-axle drive on demand.
• Limits for each vehicle type decide when 4×4 and locks can engage, the top speed while using 4×4, and automatic lock or unlock.
• Open the new 4×4 window with Left Alt + J. You will find a top view of the driveline, mouse control for 4×4, centre or inter-axle and front or rear locks, the vehicle mode saved with the savegame, tyre-pressure settings for field, road, automatic and manual operation, telemetry and all settings.
• The menu in the game’s settings was removed because it slowed loading. The whole setup is now in the window.
• For mod and DLC tractors without a profile, the transmission chooses the mode: CVT or full powershift means automatic, partial powershift means semi-automatic, and manual gearbox means manual.
• Brand profiles now work only for tractors. Massey Ferguson combines and the Kubota R640 are set to automatic. Challenger MT600 is excluded.
• Zasty HUD: activate the HUD and the 4×4 panel hides. The HUD then shows 6X4, AWD, 4X2 and the locks.
• In multiplayer, every player receives each vehicle’s driveline and mode, and the server checks the selected mode.
• Only Ctrl + J for 4×4 and Ctrl + K for locks remain as keys. Single locks, CTIS, tyre pressure, the panel and telemetry are handled in the window.
• The default-key assignment problem on a new installation has been fixed.

KEYS (default)

• Left Ctrl + J: turn 4×4 on or off.
• Left Ctrl + K: turn differential locks on or off.
• Left Alt + J: bring up the 4×4 window for locks, tyre pressure, mode and settings.

Those are the default keys. If the game or another mod already uses one, head to Options > Controls and choose the key you prefer to avoid a conflict.

V1.7.0.1

• AI helper: the combine could stop while reversing uphill and would not shift gear. Now 4×4 works only on the vehicle a player is driving. With an AI helper, when stopped with nobody inside or when parked, the vehicle falls back to the game’s original differentials, tyre radius and speed limit.
• The missing translation for Move 4WD HUD has been added, fixing a log warning in 22 languages.
• HUD textures are compressed now, so the log no longer gets raw format warnings.
• The game starts faster. The settings menu section is built only the first time you open Settings. Before this, startup froze for ~4 s.
• Vehicle Control Addon (VCA) compatibility has been added. VCA brings its own 4WD and diff locks and rewrites the differentials every frame, so the two mods were fighting each other.
• Find the new option at Settings > General > 4×4 Traction System > With Vehicle Control Addon:
  • Command VCA (default): the mod’s automatic 4WD logic, including slip, implement lowered, braking, tight turns and GPS prediction, switches VCA’s 4WD and diff locks. VCA takes care of the differentials. CTIS, tyre pressure, HUD and telemetry still work.
  • Leave to VCA: VCA is the only mod working on that vehicle.
  • Ignore VCA: the old behaviour, not recommended.
• The VCA integration should work, but it has not been tested in-game with VCA installed yet.
• Headland Management and CVT Addon were checked, with no conflicts found.