Straight4 Studios has released Project Motor Racing Update 1.6.0.1 and this one is centered on an overhaul to the GT3 tire model. The team has reworked how these cars behave at the limit, dialing in more accurate slip and grip angles, improving feedback when drivers are on the edge and creating a smoother, more natural transition between full grip and loss of traction. The idea is to make GT3 cars feel closer to their intended driving characteristics, especially when pushing hard at race pace.
As with past physics revisions, this update will impact existing setups. Custom GT3 setups created before 1.6.0.1 may no longer feel quite right and will likely need some adjustments to match the revised tire and vehicle behavior. The patch also includes Force Feedback strength balancing across the GT3 class, giving players a more consistent baseline feel out of the box. Check out the patch notes below for a complete breakdown of everything included in update 1.6.0.1.
The team also shared an article alongside update 1.6.0.1 that breaks everything down in more detail. With this update, the GT3 class is now using a revised tire model that behaves differently than before, and one of the biggest changes revolves around tire temperatures.
If drivers have been watching the tire temperature readout on the HUD and noticed it bouncing around more than it used to, there is a good reason for that. The blog takes a closer look at what is happening behind the scenes with the new system and explains what players are actually seeing from the cockpit while they are out on track.
Physics & Handling
- Implemented a more robust throttle response system.
- Revised Downshift Protection: Simplified the logic to be more reliable and added a percentage allowance for over-revving to make it less restrictive.
- Fixed issues with automatic gears and throttle blip assist for better stability during downshifts.
- Lowered Tire Pre-heating temperatures across all classes.
GT3
- Updated tire model to provide a more realistic representation of slip and grip angles, improving behavior at and beyond the limit.
- Reworked Traction Control (TC) and Antilock Braking System (ABS) logic to allow more natural lateral slip while reducing excessive longitudinal slip, improving overall balance and driveability.
- Due to these changes, players are advised to review and refine existing custom setups for this class.
LMDh
- Full Traction Control (TC) rework to improve consistency and usability.
- TC settings 2 through 10 now offer a more meaningful and usable range (Note: Setting 1 is currently bypassed/off).
- Improved downshift protection behaviour.
- Fixed an issue that could cause the engine to stall when shifting into neutral.
GTO
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Relaxed Traction Control (TC) settings to allow more performance and driver influence at the limit.
Group 5 & Group C
- Adjusted Traction Control (TC) slip angles for improved stability under load.
- Increased clutch slip on downshifts to improve stability during aggressive deceleration.
Input & Force Feedback
- Logitech TrueForce is now disabled by default on PC.
- Force Feedback (FFB) strength balanced across GT3 class for a more consistent baseline feel.
- Fixed an issue that prevented setup selection via mouse input when large numbers of setups were present.
- Improved Force Feedback (FFB) on wet track conditions.
UI
- Fixed incorrect constant data being sent via UDP.
- Improve navigation and readability in the player stats menu.
Online & Multiplayer
- Fixed an issue causing opponent cars to ghost unexpectedly during online races.
- Fixed a bug that could result in players joining an unintended lobby.
AI Opponents
- Increased grid capacity at São Paulo to support up to 32 AI vehicles on PC.
- Improved racing line behaviour across multiple circuits.
Tracks & Environment
- Optimised tree rendering and placement for improved visuals and performance.
- Adjusted track penalty trigger zones for more consistent detection.
- Improved the Racing Line assist across multiple tracks.
Vehicle Art
- Various small art fixes on several vehicles.
- Corrected MoTeC display number flickering on multiple cars.
- MoTeC displays now receive correct tire temperature data.
- Polished several driver animations.
