The move happened without warning, followed by a vague statement a day later, stating: “We believe this is the responsible course of action while good-faith discussions continue.
No further information was provided, in what is presumed to be a licensing-related dispute.
Now, 4th May 2026, and following a period of server maintenance for the Straight4 Studios-created sim racing game, digital stores have been updated.
According to the PlayStation Store, for instance, the content’s name has been changed from ‘Japanese GT500 DLC’ to ‘Japanese Prototypes DLC’.
Notably, the ‘GT500’ and ‘JGTC’ suffixes have been removed from each car name (full list below). These have been replaced with ‘JP1’ and ‘JP2’ respectively.
Strangely, the older JP2 Toyota Supra has changed from 2002 to 2003 specification.
Otherwise, it’s believed that all cars, liveries and the Takimiya Circuit (inspired by the Okayama venue) remain unaltered, with the vehicles remaining officially licensed.
GT500 is the name of the premier class in the real-world Japanese motorsport championship, Super GT, from which these cars race. Before the title change in 2005, it was formerly known as the All Japan Grand Touring Car Championship, or JGTC for short.
No formal ‘Super GT’ branding is part of the DLC pack, and now, too, class references and abbreviations have been removed.
No clarification from Straight4 Studios was forthcoming at the time of publication. It’s not yet clear when the content will be back on sale, but it’s expected imminently.
Article Update
As of 15:27 BST, 04/05/2026, the Japanese Prototypes DLC is now on sale for PlayStation and Xbox, with Steam due soon.
A general game update is also live across all platforms, updating the DLC for existing owners. It also brings with it Multi-Draw Indirect (MDI), a new relative timings leaderboard option, further changes to throttle response and anti-cheat, plus a slew of smaller tweaks. The patch notes are listed below.
Project Motor Racing Japanese Prototypes (née GT500) DLC contents
JP1 (née GT500 EVO)
2022 Nissan Calsonic Impul Z JP1 (née GT500)
2022 Honda NSX JP1 (née GT500)
2024 Honda Civic JP1 (née GT500)
2021 Nissan Motul Autech GT-R JP1 (née GT500)
2022 Toyota GR Supra JP1 (née GT500)
JP2 (née GT500)
2003 Nissan Skyline GT-R (R34) JP2 (née JGTC)
2003 Honda NSX JP2 (née JGTC)
2002 Toyota Supra JP2 (née JGTC)
2004 Nissan Fairlady Z (Z33) JP2 (née JGTC)
Track
Takimiya Circuit
Project Motor Racing Update 2.0.0.3 patch notes
Physics & Handling – Per Class
The throttle response improvements introduced in previous updates have now been extended into more classes.
Improved modelling and performance for cars equipped with a turbo.
Below is a detailed list of changes made to physics and handling-related systems.
964 Trophy
Upgraded AI opponents’ behaviour for this class.
Reworked handling model.
Improved tyre model.
992 Trophy
Upgraded AI opponents’ behaviour for this class.
Improved AI opponents’ physics for this class.
Group C
Improved modelling and performance for cars equipped with a turbo.
Tyre model updated to latest iteration as seen in Update 2.0
Improved throttle response.
GT
Upgraded AI opponents’ behaviour for this class.
Improved AI opponents’ physics for this class.
Improved modelling and performance for cars equipped with a turbo.
Tyre model updated to latest iteration as seen in Update 2.0.
Improved throttle response.
GT1
Improved modelling and performance for cars equipped with a turbo.
Tyre model updated to latest iteration as seen in Update 2.0.
Improved throttle response.
GT3
Upgraded AI opponents’ behaviour for this class.
Improved AI opponents’ physics for this class.
Improved ‘cold falloff’ tyre grip as per player feedback.
Improved throttle response.
GT4
Upgraded AI opponents’ behaviour for this class.
Improved AI opponents’ physics for this class.
Improved throttle response.
GTE
Upgraded AI opponents’ behaviour for this class.
Improved AI opponents’ physics for this class.
LMDh
Upgraded AI opponents’ behaviour for this class.
Improved AI opponents’ physics for this class.
LMP
Improved modelling and performance for cars equipped with a turbo.
Tyre model updated to latest iteration as seen in Update 2.0.
Improved throttle response.
MX-5 Trophy
Upgraded AI opponents’ behaviour on wet conditions.
Improved throttle response.
N-GT
Upgraded AI opponents’ behaviour for this class.
Improved AI opponents’ physics for this class.
Improved throttle response.
Physics & Handling – Per Vehicle
Several changes have been made to individual vehicles that do not affect other cars in their respective classes.
Those changes are detailed below.
Acura ARX-06
Fixed a bug that would prevent changing ABS value.
New default setup.
Aston Martin Vantage GT3 (2022)
Improved differential settings.
New default setup.
Aston Martin Vantage GT3
Improved differential settings.
New default setup.
BMW 320 Turbo Group 5
Improved modelling and performance.
BMW M4 GT3
Improved weight balance.
New default setup.
Lamborghini Huracán GT3 Evo2
New default setup.
Art – Vehicles
Improved lighting on headlights for the player car.
Several vehicles have received multiple visual improvements, along with minor fixes to visual effects.
Below is a detailed list of changes made to vehicle art-related components.
Acura ARX-06
Improved cockpit camera view to show correct bodywork details.
BMW 320 Turbo Group 5
Improved setup menu details.
Fixed a typo in the setup menu.
Mercedes-Benz Sauber C9
Fixed an issue with the MoTeC system displaying speed units incorrectly.
Nissan Datsun 280ZX Turbo
Updated car name and description field to display correctly in the UI.
Improved bonnet camera view.
Nissan R390 GT1
Minor updates to flavour text in the description.
Updated engine specs to display correctly in the UI.
Nissan Skyline GTR (R34)
Updated engine specs to display correctly in the UI.
Peugeot 9X8
Updated the #95 livery.
Toyota Supra JP2
Updated bodywork to reflect the correct model year from 2003.
Art – Environment
Further improvements made to trackside vegetation for better performance and reduced shadow popping
Circuit de Spa-Francorchamps
Improved track limits penalty detection.
Circuit Zolder
Further optimisation for better performance.
Daytona International Speedway.
Minor art improvements for more consistent visuals.
Further optimisation for improved performance.
Mount Panorama Circuit
Minor art improvements for more consistent visuals.
Further optimisation for improved performance.
Nürburgring
Grand Prix Layout: fixed an issue where the pit limiter would not disengage when exiting the pits.
Improved HUD mini-map.
Nürburgring 24 Hours
Added a shortcut to allow pit entry without needing to enter the Nordschleife.
Improved HUD mini-map.
San Marino
Fixed visual bug on trackside barriers.
Improved track limits penalty detection.
Sebring International Raceway
Optimised collision meshes for selected kerbs to improve physics behaviour.
Takimiya International Circuit
Adjusted start/finish line placement.
Gameplay & UI
Fixed an issue with the Race Engineer reporting vehicle damage when damage was disabled.
Improved text placement to prevent overlapping UI elements.
Further improvements made to the Radar System for greater accuracy.
Fixed an issue where certain car thumbnails did not match the selected livery in the car selection screen.
ModHub: installed items now display correctly in the Installed tab.
ModHub: added a “download in progress” UI element for active downloads.
Fixed an issue with loading and saving custom car setups while in the pits.
Fixed an issue that showed incorrect opponent numbers in Race Weekend when the “Identical Vehicle” option was enabled.
Improved delta timings for practice and qualifying sessions.
Digidash: added relative timings leaderboard.
AI Opponents
Removed duplicated names.
Tyre wear now resets correctly when entering a new session.
Lime Rock – Chicane: reworked racing lines.
Improved AI opponent tyre wear behaviour, including more natural grip falloff over distance.
Performance
Introduced MDI (Multi-Draw Indirect) for improved performance and stability.
This change currently affects PC only and will be expanded to consoles in a future patch.
PC players should see significant performance gains as a result.
Online
Further stability and performance improvements.
Fixed an issue that prevented some players from joining Ranked Online at times
Added a kick option for Custom Lobbies.
Improved navigation in the Custom Lobby menu.
Expanded anti-cheat systems into Factory Driver Challenge, Endurance Hall, and Ranked Online License Test.
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