🛠️ Essential Tools
Zaz Tools (CSM, TSM, Slimtex, EasyWad)
By: Zaz
Includes CSM 1.27c (updated May 25), TSM, Slimtex and Easywad | Advanced Docs Download
Notes on CSM process (vital for Inject dll to work) | Öggo's Dev Corner
GP4 Memory Access
By: Carl_gpgames, Zaz, Öggo
GP4 Memory Access allows you to directly access and edit the game's memory. It allows you to inject new code (DLL's) as well as full compatibility with GPxPatch and GP4 Tweaker.
You can save, organize, edit, import and export all kinds of patches and tweaks. GP4 Memory Access does not make any changes to your files (such as gp4.exe). Whatever it does, it only does in memory. This means no more fiddling with a corrupt gp4.exe.
GP4 Memory Access might change the way and philosophy you have used to modify GP4 so far. However, it provides full support for known formats (e.g. g3p from Physics Editor or patch.ini from CSM). | Info
Also see: Öggo's Dev Corner
↓ DownloadGPxPatch 4.52
By: SDI
GPxPatch is a real-time extension for GP3, GP3-2000, and GP4 that includes features like official tv-style information, detailed on-screen race information, a track manager, a carset manager, extended save games, 3D sound, event sounds, internet play, taking screenshots, and more.
Wad Controller 1.1
By: Duffer
With Wad Controller you can tweak all files in your wad files.
🛠️ Modding Tools
GP4 Mesh Tools for Blender v2.3
updated February 2025By: Öggo
Blender Plugins for .gp4 format, pit crews and props and animations. It is now compatible with Blender v 4.1
Individual Meshes and Textures DLL v1.4.1
updated February 2025By: Öggo
This DLL expands original GP4 to allow ull control of how meshes (front/rear wheels, helmets, cockpits, cars), collision meshes, and textures (cockpits, helmets) are loaded, supporting per-driver, per-team, and per-track custom loading. It includes features to manage LODs (Level of Detail), auto-naming conventions, and fallbacks to default GP4 assets when custom assets are unavailable.
This DLL enables, for the first time ever, the possibility of having individual cockpits, as this was not possible in native GP4.
Since version 1.2, it is also now possible to have individual collision mesh files, instead of a single generic one for all cars.
Version 1.3 introduces the possibility to use GP4's native Visor Shader (the one used for helmet Visor objects and car z_cockpit_visor objects) for cockpit meshes, basically allowing to have a proper "glass" windshield in cockpit view.
Added in version 1.4, this DLL now seamlessly fix the reversed tyre tread bug when using 3D rims.
***Requires either GP4 Memory Access or CSM to run ***
Hi-res Pitcrews DLL v1.0
By: Öggo
A DLL to overcome the original limitation of 400 vertices for pitcrew meshes in Grand Prix 4, allowing high resolution pitcrew meshes to be used.
***Requires either GP4 Memory Access or CSM to run ***
GP4Builder 2017B
By: Lo2k
GP4Builder 2017B is the latest tool revision to edit Grand Prix 4 game 3D objects.
From tiny objects like helmets to complete new tracks, you can rebuild everything with this tool and preview all the changes in realtime.
Zmodeler 1.07B
(with additional filters)By: Zanoza
Modeler compatible with GP4 filetypes
🛠️ Editing Tools
Background Sound Converter v2.0
By: Gilles Salerno
Menu Sound Converter (also works for GP3)
CAP Converter 1.0
By: Öggo
Here's a little tool developed to convert CSM CAP files to INI files and vice versa.
Collision Mesh Editor 1.0
By: Öggo
With this tool, you'll be able to edit the points the game uses to detect car collisions with other objects (other cars or static objects). The editor also allow the end user to import a *.gp4 car mesh and attempt an automatic calculation of the collision points. In the original Collison Mesh file, the points are located in the vicinity of the centre of the respective object bounding box. The automatic calculation attempts to recreate the same situation. The calculation will get the collision points in the vicinity of where they should be and is in no way meant to provide a perfect end result as far as collisions, that will need to be verified in-game for better results.
FFB Power 1.1
By: Lo2k
A small tool to tweak the Force Feedback power of your steering wheel up to 127% (instead of 100% through game menu).
GPaediaMaker
By: petrus
GP4 GPaediaMaker helps you create up-to-date gpaedia GPS and menu STR files for GP4 using simple data sheets for drivers, teams, and tracks.
It uses configuration and language files to generate standard or custom formats, with support for:
- Translations (German, Spanish, French, Italian)
- Track-specific GPS files in CSM mods
- Team and track selection in CSM mods
GPI Browser 1.2
By: Lo2k
GPI Browser is born in december 2002 when Jon Walton and me decided to find GP4 menu images. We finally found them and Jon was able to afford a first editing possibility through Carset Creator but I never managed how to export/import tga files to replace the files and GPI Browser left aside.
Thanks to better knowledge and to other works around file formats, I discovered I was finally able to complete that tool and here it is.
Individual H&W Tweaker 1.1
By: Duffer & Öggo
For Non CSM User, you can enjoy the discovery of Öggo, for the use of several shapes of helmet and wheels
LCD Font Color 2.1
By: Duffer & Öggo
LCD Color Font allows to modify some things on the steering wheel
GP4 Pit & Lap Editor 1.2
By: Alessandro Carrera
An utility to edit GP4 pistop strategies.
Records Editor 1.0
By: Lo2k
- Edit records stored by the game that can't be edited in the .gps files.
- Load and save .rec files created from the game.
GP4 Renamer
By: Öggo
Quick renaming tool for lods creation (particularly if working with 3ds files)
GP4 Rewards v1.6
By: Lo2k, Shutt1e
This tool has been built to change Championship points to match any point system.
Features- Edit points rewards for all 22 cars
- Compliant with GP4 original and GP4 1.02
- Four presets for main point systems
- Modify menu lengths to display more results
- Load/save your custom point systems
New in version 1.6: You can now adjust two additional menu lengths —
the Constructors Race Points List and Championship Leaders List.
Thanks to Shutt1e for the contribution.
Season Result Tools
By: petrus
This archive includes two Windows tools (no install needed) to help print GP4 season results.
seasonresult – Merges GP4 championship season files, especially for more than 17 races. Pulls missing data from race 17’s result file. Try it with the included 2015 example. See seasonresult-readme.txt for details.
gp4results – For non-championship races. Combines full result files to create custom championships with driver and constructor standings. An example from 2001 is included. See gp4result-readme.txt for details.
Setup Editor
By: Zaz
Very old but still useful tool by ZaZ to edit setups outside the game.
Starting Light editor 1.0
By: Patrick C
It can be used to set custom starting light position for new tracks.
PS: Tool is given "as is" so be sure to make backups before all.
Team Editor 3.5
By: Lo2k
TeamEditor is an all-in-one editing tool.
It is the result of the fusion of CamEditor (Cameras editing), TyrePos & TyreSet (Tyres), TeamEditor (Performances), LiveryEditor (Team Management) and On the Gridline (Performances calculator) and goes further in Team editing and management for GP4.
🛠️ Helpful Utilities, Tweaks and Patches
Car Physics Missing weight Value Cap
By: Prblanco
A common bug in recent F1 mods is that cc-cars completely miss the braking point at slower corners (think Monza first chicane), failing to compensate for the extra weight of modern cars. Why that happened remained a mystery, until...I noticed the car weight is stored three times in the GP4.exe, but Physics Editor 1.03 only updates two of them. The third one seems to be linked to braking calculations, and updating it seems to fix the issue. I've made some .cap files (for use with CSM mods, paste in Patch folder) with values for the last few F1 seasons, ready to use, in the link below. These files do not affect and are not influenced by the weight in the .g3p physics file, so you still need those as well
GP4 D3D8dll Zfighting Stencil Buffer Fix
By: gplaps
Fix for distant flickering
No Refueling Animation
By: 32bobo32
This patches the animations to remove the refueller without CTDs.
This is to be used in conjunction with →
↓ DownloadNo Refueling Patch
By: Prblanco
This enables all cars to start the race with full fuel loads.
↓ DownloadHelmet Visor Colours
By: Öggo
Another helpful fix is an age annoying uneditable item in GP4. Originally, the Arrows drivers had orange tinted visors and one of the Minardi drivers had a green tint. This was great for 2001, but it was annoying it continues to be seen in mods. Now this can not only be remedied, but all visors are now customisable per driver.
GP4 Fun
VR Headsets & AI CommentaryBy: Sergio Poletti
GP4 Fun is a Grand Prix 4 add-on that allows to play GP4 using last generation Virtual Reality headsets and to listen a voice commentary about race context of current player and his competitors, including overtakings, distances between drivers, realtime placements and championship ranking informations.
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