Project Motor Racing Mods: ModHub, Vehicles, and Install Guide

Project Motor Racing mods allow players to expand the sim with custom car conversions, standalone tracks, real-world racing liveries, and physics overhauls. Thanks to the game's foundation on GIANTS Engine 10, modding support is integrated directly into the title through an official cross-platform menu known as the ModHub, while PC players can also access advanced third-party modifications through external community hubs.

Whether you are looking to install official bonus machinery, enter balanced league competitions, or design your own team paint jobs, this guide breaks down how the modification system works across platforms and highlights the most notable community creations.

How the In-Game ModHub Works

Project Motor Racing features built-in mod support accessible directly from the main interface. Navigating to Downloadable Content opens the ModHub, allowing players on both PC and consoles (including PlayStation 5) to browse, download, and manage game modifications without manually editing game directories.

The ModHub is divided into specific content sections:

• Vehicles: Standalone car models and manufacturer additions.
• Packages: Multi-vehicle packs, engine conversion sets, and expansion bundles.
• Liveries: Community and replica paint schemes across various motorsport disciplines.
• Career Events: Custom championships, endurance additions, and calendar entries.
• Vehicle Setup: Community-tuned mechanical configurations for specific circuits.

On PlayStation 5 consoles, the ModHub displays an allocated storage limit of 8,190.95 MB (approximately 8 GB). Once a player selects a mod and completes the download, the content is automatically installed and immediately available across Single Player Race Weekends and Custom Lobbies.

Standalone Cars and Spec Racing Conversions

Community modders and developer Straight4 Studios have published several standalone vehicles and class adjustments directly to the ModHub.

Praga Bohema 2023

Released as an official vehicle addition by Straight4 Studios, the Praga Bohema 2023 commemorates the manufacturer's 89th anniversary. Producing 700 horsepower from a 6-cylinder motor, it sits in the Track Day category. Community testing highlights that the Bohema demands delicate throttle management, with noticeable oversteer when accelerating out of low-speed corners.

GT4 F1 Engines Mod

Created by Eagles Modding, this 40.98 MB pack takes six standard GT4 models—including the Aston Martin, BMW M4, Chevrolet Camaro, Ford Mustang, Mercedes-AMG, and Toyota Supra—and replaces their standard powertrains with Formula 1-inspired high-revving V8, V10, and V12 engines. The pack also adds stiffer spring options, higher downforce settings, and a dedicated career World Tour with day and night championship tiers carrying entry fees ranging from $2,000 to $57,000.

The GT3 Spec Class Controversy

Created by modder Zlesi, the GT3 Spec Class was designed to solve balance-of-performance disputes in online league racing. The mod takes all 10 base-game GT3 chassis and standardizes them to the engine, physics, gearbox, aerodynamics, weight, tires, and suspension of the Aston Martin Vantage GT3 Evo, while retaining each car's original exterior body and sound.

Most mechanical setup options are locked, leaving only tire selection (A2 hard or wet), caster offset, final drive, brake pressure, brake bias, ABS, traction control, and fuel load open to the driver.

However, community testing has revealed mixed findings regarding pure equality:

• Some sim testers observed identical acceleration runs and matching lap times across differing models such as the Acura NSX, Ford Mustang, and Porsche 992 GT3 R.
• Other competitive drivers discovered that weight distribution and wheelbase variances still alter handling balance. In those tests, front-engine cars like the BMW retained loose, oversteer-prone exits, rear-engine cars like the Porsche suffered slight front-end understeer while offering exceptional rear traction, and mid-engine platforms like the Audi provided the most stable, neutral handling balance.

Custom Tracks and Proving Grounds

Circuits in Project Motor Racing require extensive optimization, but both official bonus layouts and community-made environments have arrived on the ModHub.

PMR Test Centre

Developed by Straight4 Studios as an internal proving ground before being released as a free ModHub download, the PMR Test Centre is located near Santa Giustina, Italy. Designed to test surface materials, force feedback, and vehicle balance, it features six distinct configurations:

• Racing Layout: A complete, fully dressed racing circuit with trackside barriers and kerbs.
• Big Loop: A high-speed oval layout built for top-speed stability runs.
• Small Loop: A short circuit designed for rapid testing loops.
• Small Needle Skidpad: An open tarmac skidpad for drift testing and car control.
• Big Needle Route: A hybrid layout combining technical corners with banked oval turns.
• Playground: An open testing zone with penalties disabled, featuring experimental surface strips.

Straight4 Studios also announced accompanying documentation to guide modders through track creation workflows based on the Test Centre's source structure.

Apex Nova, The Racing Venue

Designed by track creator Tomas Trlica, Apex Nova is a fast, narrow fictional venue inspired by the Nürburgring Nordschleife. Characterized by almost zero runoff space, it is intended for high-downforce classes such as JP1, LMDh, and Group C. Apex Nova features four layout lengths:

• Short: 5 km (3.1 miles)
• Medium: 7 km (4.3 miles)
• Long: 8.5 km (5.2 miles)
• Full: 11.6 km (7.2 miles), where a clean GT3 lap averages roughly four minutes.

Custom Liveries and Skin Creation Pipeline

Custom skins make up the largest portion of the ModHub catalog, with regular additions from creators like FreeFlow, Manx (MENX), Ratty's Liveries, Marcolino, Graphic Content, and RMi.

ModHub liveries range from historical tributes (such as FreeFlow's 1997 Le Mans GT1 pack featuring the Nissan R390, Mercedes CLK-GTR, and Panoz Esperante GTR-1 in F1-inspired paint schemes) to real-world Supercars, IMSA designs, and Trans-Am replicas. Note that tobacco-sponsored liveries are strictly prohibited from the in-game ModHub and must be installed manually on PC.

How to Build a Custom Livery

For PC players looking to create their own designs using image editing software (such as Affinity Photo or Photoshop) and Visual Studio Code, the workflow relies on standard GIANTS Engine texture conventions:

1. Locate Base Templates: Extract an existing vehicle livery mod package to examine the folder structure, which contains the modDesc.xml file, vehicle data subfolders, and texture files.
2. Edit the Albedo Map: Open the Albedo (ALB) texture to paint base colors, body lines, and partner logos.
3. Configure the ARM Texture: The ARM map dictates surface material properties across three color channels:

• Alpha Channel: Determines paint coverage versus exposed carbon fiber. Pure white renders painted bodywork, while pure black renders raw carbon fiber.
• Green Channel: Controls surface roughness. Darker shades create high gloss and reflections, while brighter shades or pure white produce a flat, matte, or sticker-like finish.
• Blue Channel: Controls metallic properties. Grayscale values add metallic flakes, while pure black denotes non-metallic surfaces.

4. Convert Textures with GIANTS Developer Tools: Using the official GIANTS Texture Tool 901 (available on the GIANTS Developer Network) alongside custom .gim instruction files, convert working PNG files back into game-ready DDS format. GIM downscale flags can automatically optimize 8K source textures down to 4K or 2K.
5. Link Files in XML: Update the livery XML and modDesc.xml so that texture paths, author credits, and thumbnail definitions align with your custom files.

PC-Exclusive Mods and Physics Overhauls

Beyond the ModHub, players on PC have access to third-party mods hosted on platforms like OverTake.gg and Nexus Mods. These modifications alter deeper core systems but are not available on consoles.

• Manual Mod Directory: Standard loose-file PC mods and unapproved liveries are installed directly into the user directory located at Documents\My Games\ProjectMotorRacing\mods.
• PMR Realism Overhaul: Created by EWSimRacing, this data-level modification edits XML parameters, tire physics tables, and hadron overlays to adjust grip falloff, tire wear, and visual sharpness. Because it modifies core data files, it is strictly an offline and single-player mod; running it in multiplayer will trigger file mismatch errors.
• Shaders and Visuals: Bit Viper's RenoDX mod rewrites DirectX 12 shaders to introduce true HDR output and refined color grading, eliminating the washed-out baseline look of the vanilla rendering engine.
• AI and Force Feedback Tools: Mods such as EWSR RaceIQ provide AI overhauls, while PMR TireSense and MCP4SH deliver alternative telemetry profiles for SimHub tactile haptic rigs.

Frequently Asked Questions

Can console players download Project Motor Racing mods?

Yes. Console players on platforms like the PlayStation 5 can download approved cars, liveries, tracks, and career events directly through the in-game ModHub under Downloadable Content. However, third-party physics overhauls, custom shader injectors, and loose-file mods from sites like OverTake.gg or Nexus Mods remain PC-exclusive.

How much mod storage space is available on console?

On PS5, the in-game ModHub allocates a total mod storage capacity of 8,190.95 MB (around 8 GB). Players must manage their installed files to ensure large livery packs or multi-car packages stay within this limit.

Can I use physics overhaul mods in multiplayer lobbies?

No. Comprehensive handling and physics overhauls, such as EWSimRacing's PMR Realism Overhaul, alter baseline configuration files. Attempting to enter multiplayer lobbies with these mods installed results in a file mismatch error. They are intended exclusively for offline testing, Career Mode, and solo race weekends.

Why are certain sponsor liveries missing from the ModHub?

The official ModHub adheres to platform and publisher publishing guidelines, which prohibit tobacco-related sponsor branding. Replicas that feature historical cigarette branding can only be obtained through external PC mod repositories and must be placed manually into your local mods folder.