GP4: 2026 CSM & non-CSM mod by fongu

 

The first version of the 2026 Grand Prix 4 Mod is finally here!

First and foremost, I'd like to thank all of the original authors whose work has made this release possible. My role has largely been to compile, adapt, and bring everything together into a complete package.

This release features the full 2026 Formula One grid, with cars created by Excalibur and Isaint. I was also pleased to contribute by creating several of this year's cars myself. The Cadillac livery has been revised and is now much closer to the real-world design than the version included in the initial release.
This release also introduces special liveries for used in the early season Grands Prix:

• Japanese Grand Prix – Mercedes, Racing Bulls and Haas special liveries.
• Miami Grand Prix – Racing Bulls, Alpine, and Cadillac special liveries.

These are included alongside the standard 2026 season liveries

The 2026 helmet set has been built on Theofilos' excellent RHP helmet templates, along with Jvinu's Schuberth and Stilo templates. I'm grateful to both of them for providing such a solid foundation on which to paint my own helmets.

Many thanks also go to Excalibur for the updated tyres and the new 3D wheel rims, which add another level of authenticity to the cars.

As with previous releases, this mod benefits enormously from Öggo's GP4++, which brings a wealth of graphical and gameplay enhancements. The flashing lights in particular look fantastic. I've also included gplaps' z-buffer fix. While this feature is now available within GP4++, it is configured here to work alongside crosire's DirectX 9 patch for the best compatibility.

Thanks again to Öggo for making individual cockpit shapes possible. This allowed me to convert cockpit interiors directly from each car, and this release includes the new Aston Martin internal steering wheel.

As always, a huge thank you to Gitanes for his outstanding performance files and physics, which continue to provide an excellent driving experience.

I'm also grateful to Mailson Teles for sharing his updated 2026 TV graphics package, which introduces several exciting new features.

The sound package included in this release is the excellent 2025 Red Bull Honda set by jcgrj.

There are many more contributors who deserve recognition, and a full list of credits is included with the mod. Without the work of the entire GP4 community, this project would be a shadow of what it is.

For a number of reasons, I've had to scale back my modding over the past few months, so I apologise that this release has taken longer than I had hoped. My original plan was to include several additional features and improvements, but unfortunately time simply didn't allow me to complete everything in time for this first release.

As with last year's mod, there is also a non-CSM version which is available too.

I hope you enjoy the mod, and thank you all for your continued support of the Grand Prix 4 community.

GP4: 2025 RHP Helmets by fongu, Theofilos, Excalibur and Nick9320

2025 F1 Helmets Mod for Grand Prix 4

Overview

Apologies for the delay in releasing this, but this is the 2025 helmet set. 

With Jvinu's shapes becoming increasingly out-dated, I was glad to see that new helmet shapes were being developed. ASCPRH had now progressed to version 2, and whilst I had permission and agreement to work with Marco_17, I was unable to contact Daimon for his permission of his helmet shapes. So I was glad to see that Theofilos, some of whose helmets I had converted to GP4 before, had started working on new helmet shapes. 

The project is called 'The Real Helmet Project' (RHP): 

https://www.overtake.gg/downloads/rhp-real-helmets-project.75985/

As previously explained, the converted helmets of the Arai GP7 and the Bell HP77 are from the pre-VRC release of the Real Helmets Project (RHP) by Theofilos. 

Nick9320 and I reached out and struck up a working relationship at the time and whilst this project has taken time, I am glad for the helmet upgrade and I think it has been worth the wait. For the time being, we wait for the Schuberth and the Stilo helmets to be made, I continue to work on Jvinu's helmets for the time being. 

There are two visor strip versions on the Bell helmet, as well as two wing options. The colour of the driver internal fabric is also specific to each driver now. My thanks goes to Excalibur for helping with the conversion. The hans device remains Jvinu's version, simply because it fits GP4  driver bodies better. 

Theofilos is a very talented 3D and 2D artist, and he has painted both Mercedes helmets and the Ferrari helmets, they look stunning. 

Credits

All helmets have been designed from scratch with a focus on accuracy and high-resolution detail.

• Arai & Bell helmet – is from Theofilos’ Real Helmet Project (pre-VRC versions) and converted by Excalibur
• Ferrari & Mercedes helmets – are painted by Theofilos
• Schuberth & Stilo – templates by Jvinu (ACSPRH v1)
• All other helmet designsby fongu

Download

2025 F1 Helmets by fongu & Theofilos

Download

GP4: 2026 Helmets by fongu & Theofilos

2026 F1 Helmets Mod for Grand Prix 4

4K • Full Grid • Accurate Driver Helmets

Overview

The 2026 helmet pack is now available.

Every helmet has been recreated from scratch in 4K resolution, bringing the current F1 grid into GP4 with improved clarity, sharper detail, and more accurate representation of real-world designs.

Credits

This release couldn’t happen without the brilliant work by others in the community, with helmet shapes and templates by Jvinu (ACSPRH v1) and Theofilos (RHP).

All helmets have been designed from the ground up, with a focus on accuracy and high-resolution detail.

• Bell helmet – is from Theofilos’ Real Helmet Project (pre-VRC versions)
• Ferrari helmets – are painted by Theofilos, adapted by fongu
• Schuberth & Stilo – templates by Jvinu (ACSPRH v1)

Driver-Specific Features

This pack reflects the current F1 grid as closely as possible, with each helmet matched to its correct shape and visual identity.

Helmets are not interchangeable — each design is built specifically for its intended model.

Verstappen

Number 3 added to the transparent wing.

Charles Leclerc

HP logo added to the transparent wing (Ferrari helmet).

Lewis Hamilton

HP logo added to the transparent wing (Ferrari helmet).

Valtteri Bottas

Finnish flag added to tear-off strip handles.

Final Notes

I hope you enjoy this new helmet set and its improvements. Each year, I try to add a new level of realism and accuracy. This season it is the 4K textures and some new specific shapes for drivers.

Thanks for the support, and enjoy.

Download

2026 F1 Helmets by fongu & Theofilos

Download

GP4: Real Helmets Project – Arai GP7 & Bell HP77 Templates

 

I’m very grateful to Theofilos for starting the Real Helmets Project for Assetto Corsa last year. It’s an incredibly detailed and well-researched helmet project, and it immediately stood out for its accuracy and modelling quality.

With his permission, both myself and Nick9320 (who now primarily mods for rFactor 2) were able to convert the work to our respective games, helping bring a consistent, high-quality helmet standard across multiple sims.

So far, the project includes:

• The Arai GP7

• The Bell HP77

Both helmets come with various clear and solid wing variants. The Bell HP77 also includes the alternative wing specification used by the Ferrari drivers, again available in both clear and solid versions.

In addition, the Bell features multiple visor options:

• Standard short visor strip

• Extended visor strip variant

These small details make a big difference when recreating specific drivers and seasons accurately.

I’ll admit this release took a little longer than planned. Part of that was waiting to see whether Theofilos would be adding the Stilo and Schuberth helmets to the project. In the end, he shifted focus toward improving the driver body model in collaboration with the VRC modding team instead.

You can find the original Assetto Corsa release here:
https://www.overtake.gg/downloads/vrc-rhp-real-helmets-project.75985/

Today, I’m releasing the converted helmets for GP4 (kindly converted by Excalibur), along with the original templates provided by Theofilos.

The key benefit of this approach is compatibility. Helmets created using these templates will now work consistently across all three supported sims. That opens the door to shared designs, easier collaboration, and a unified standard moving forward.

Personally, I’m really pleased to have these available. They’re noticeably more detailed and more accurate than the previous generation of helmets, and they raise the visual standard of modern-era mods considerably.

Huge thanks again to Theofilos for the original project — and to everyone involved in bringing it across to other platforms.

*** These helmets are based on the original RHP release. I am trying to gain permission to release the updated VRC version. ***

Real Helmets Project v1.0

by Theofilos, Excalibur, fongu

Download

GP4: F1 2025 Mod update v1.2 (CSM) **updated 4th Feb**

F1 2025 Mod compiled by fongu

Here is another update to the 2025 mod. 

Another small update adds some updates for up to the end of the season. This includes performance files by Gitanes, as well as updated track specific weather settings. 

Excalibur has released some excellent additional liveries for the Williams and these have been included in this mod. 

Thanks also to Mailson Teles for exclusively sharing his TV style updated to 2025 exclusively for this mod. There is an option in the CSM menu to enable/disable this, under the TV overlay drop down. 

Thanks to Superman77, the external steering wheels have been fine tuned and the rev lights fit the individual steering wheels much better now. 

The Sound Hardware Acceleration has been updated to a more updated version from GitHub. It's by a number of collaborators. 

The biggest update to this release is by Öggo and thanks to the upgrade of GP4++ to v2.2. This adds modding capabilities to the rear light and blinking under different circumstances. This has now been added to the mod: 

• Now the rain light blinks in wet weather. 
• There is a ERS charging light when you lift and coast. 
• The pit lane light also blinks, but at a different speed to the others. 

Sadly, this does not fix the GP4Tweaker limitation of having a brake light to enable multiple ambient glows, but I have tried to limit it by setting the threshold to 200% brake pressure. It is not full-proof, but also the ERS charging light also comes on when braking at speed. Anyay, GP4++ works seamlessly with GP4Tweaker. 

I hope you enjoy this update. Here's a little video preview of the mod in action. 

Installation Notes

F1 2025 CSM Mod

This is a patch of the original mod, so you will need to install that first

F1 2025 Mod CSM

2025 CSM F1 Mod Update v1.2

Download and install this update from the CSM menu

This package was updated 4th February 2026 to fix the TV graphics

Download update v1.2

GP4: 2025 stand-alone mod (GP4 Memory Access)

F1 2025 Mod compiled by fongu

Let me wish you a very happy New Year. 

I am proud to release to you the 2025 mod as a non-CSM, stand-alone version, the first mod to be released using GP4 Memory Access. 

Like the CSM mod, this is a little bit proof-of-concept than a full blown complete mod. This mod shows a working example of how to use GP4 Memory Access by Carl_gpgames and Öggo. 

I've spent less time creating content and more time in exploring new features to present to you - hoping that other authors may be able to fill in some of the gaps. 

All of the content is already compiled in the CSM version of the mod: 2025 CSM Mod

This has no tracks included, no driver changes, no additional liveries and no special helmets - it's just a generic base 2025 mod. 

What is new to this mod, and will soon be added to the CSM version, are the 2025 TV graphics by Mailson Teles. 

Installation Notes

F1 2025 Stand-alone Mod

Download

To run this mod, simply:

• extract the GP4-2025 folder anywhere on your machine. 
• Open GP4MemoryAccess.exe
• Click 'Patch & Run' on the bottom
• Enjoy racing!

GP4: F1 2025 Mod update v1.1 (CSM)

F1 2025 Mod compiled by fongu

I present to you an update for the F1 2025 Mod. 

This is not a big update, but it contains some fixes and some new files. 

Thanks to jcgrj for creating new sounds from the 2025 Red Bull RB21, which has been added to the mod. 

Thanks also to Gitanes for his recently updated performance files. The average and track specific performaces have been updated up to and including the Brazilian GP. 

And thanks to Excalibur for updating his Williams livery and rims with the Austin GP special livery. 

2025 Williams Austin GP livery by Excalibur

Max Verstappen has been running a transparent wing on his helmet, so I have updated the helmet shape by Jvinu to reflect that in this mod. 

There's also some fixes as well. 

The Mercedes internal steering wheel has been fixed, some of the readouts were incorrectly positioned. 

There was an error in the physics loading, that has now been rectified. 

GP4: F1 2025 Mod v1.0 (CSM)

It's here and ready - the 2025 CSM mod has just dropped. 

As with my previous 2023/24 season mods, this mod is the base mod with everything working smoothly. So it is a kind of work in progress release, designed with future add-ons in mind. 

The mods that I have released this year have been redesigned to make use of Öggos' InjectDLL and bringing new features to current season mods. Whilst the structure has many similarities to the previous seasons, it has significant changes means this is a completely new mod. 

Much of the content in this mod has been released here: https://fongugp4.blogspot.com/p/gp4-2025-download-sources.html

All the cars have been brought to us by the RSCT team of Excalibur and Isaint. I have modified Isaint's cars a little, mostly bug fixes to stop the flickering textures and I have repositioned some of the rear wheel hubs to be more realistic. 

I have also taken all these cars and created them for internal cockpit use. This is a new feature, and with the dashes on the wheel instead of the cockpit shape, it makes for a much easier conversion. Because these cockpits use the main texture, track specific liveries work seamlessly without any additional editing.

Also new, to go with the individual cockpits, are steering wheels for each team. They are based on the 2024 versions and both internal and external versions of these wheels are in the game. As it remains a limitation to run one steering wheel for all teams, you simply need to select a driver from the CSM menu to use that team's steering wheel. 

Thanks again to Excalibur for his excellent 3D rims, however I have amended the size of them and created lods, as in previous seasons with Carl_gpgames. 

Thanks once more to Gitanes for his work on performance files, including torque files, physics and magic data files for each track. The magic data, as in previous mods, is a little experimental, it does depend on how you install your tracks and the TSM profile name you use. I have added an option to turn the torque tweak off, this occassionaly makes cars sit in their pitbox for a good while before the mechanics start work - it is not a foolproof fix though. 

Thanks to Mailson_Teles for his lovely loading screens and to jcgrj for the 2024 engine sounds.

I will talk about the new helmets in their own dedicated post, but I'm indebted to Theofilos for creating and sharing his Real Helmets Project. So far only the Arai and Bell helmet variations have been done, a very nice upgrade from before. Thanks to Excalibur for help in the conversion. Instead of waiting for the set to be complete, I have quickly painted some Schuberth and Stilo helmets on Jvinu's shape for the time being. These temporary helmets are not as accurate as the main set. 

To get this mod released, I had to rush to put some generic items in, like high resolution team arts, plain pitcrews and engineers, not in any way accurate. There remains a generic internal visor. To get this mod released, I thought it was better to have something generic, and these can be patched later as people create them. 

As always, thanks to a good number of community members who made this mod possible - some of them long gone from modding sadly, but their work is still being used to this day. 

• Carl_gpgames - CSM structure base, Generic internal cockpit, pitprops, pitmonitor, GPxPatch graphics, background videos, music and GP4 Memory Access and coding help. 
• Öggo - Blender plugins, Car Collision editor, Individual tyres & helmets tweak, Visor colour cap, gpf editor, Injectdll, csm procss and general support and bug fixing.
• 32bobo32 - Pitcrew & Engineer Template, Director & marshal skins. Hi res menu items, no refuel animation, menu fonts, HUD. hi res menu font
• prblanco - various caps
• gplaps - DirectX 8 patch
• crosire - DirectX 9 patch
• gp4wonder / DOSOAL - Sound Hardware Acceleration
• Petrus - GPH Updater
• btone & Ruboy - Def Panel
• Duffer - LCD font editor
• Zaz  - CSM, TSM, Slimtex... and the rest of Zaz Tools
• Rene Smit  - GPxPatch
• Madman271 - GP4Tweaker
• Lo2K  - GP4 Builder
• KerleyF1 - general help, support and testing

Installation Notes

Zaz Tools & GpxPatch

As with all my mods, you will need Zaz Tools and GpxPatch installed. You will also need to install CSM Process (CSM Add-on) for this mod to work too.

Follow this guide to help you install it: Guide to installing Zaz Tools and CSMProcess

Download GPxPatch Download Zaz Tools Download CSM Add-on

2025 CSM F1 Mod

Download and install this mod from the CSM menu

Download Part 1 Download Part 2

Update v1.1

Download update v1.1

Update v1.2

Download update v1.2

Version History

v1.1 released Nov 25

v1.2 released Jan 26

Happy racing!

Non-CSM standalone version

I have released a non-CSM version for those who prefer it.

Link

GP4: 2023 mod v1.4 update

Hey GP4 fans, it's time for another monster mod update, and this time it's for the 2023 mod. 

This update is only possible because of the dedicated work of Paulo Derpich, my thanks goes to him. Like the 2024 mod, Paulo has gone through the entire 2023 season, and for all teams, has brought all the track specific changes not already created. 

Thanks to all the original authors who did the hard work of creating the cars and doing the original paintwork. There was a good selection of special liveries previously available, but this update is much more complete with all the sponsor changes throughout the season. This really does help the immersion as you work your way from track to track through the season.

It's really impossible to list all the changes, but here's a few screenshots from the Miami cars:

I had done some very quick cockpit colours on Carl's 2022 cockpit, and Paulo has updated them with sponsors and details and track specific changes as well. Here's a sample of the McLaren Monaco and British GP special liveries and an Aston Martin one too. 

Installation Notes

2023 mod:

This update requires 2023 F1 mod previously released on this blog here: 
https://fongugp4.blogspot.com/2024/08/gp4-f1-2023-mod.html

• Download all 3 CSM mod updates below:

CSM update - 2023 mod part 3  (v1.4 released February 2025)
CSM update - 2023 mod part 4  (v1.4 released February 2025)
CSM update - 2023 mod part 5  (v1.4 released February 2025)

• Open CSM
• File | Install new carset template | select F1 2023F CMU23_update3_v1.4.cmu
• File | Install new carset template | select F1 2023F CMU23_update4_v1.4.cmu
• File | Install new carset template | select F1 2023F CMU23_update5_v1.4.cmu

Thank you all for your continued support for GP4. 

GP4: F1 2024 mod v1.6 update

I want to wish you all a very happy Christmas. 

Here's an update to the 2024 mod that brings us to the end of the season. 

In this update we have another update to the Williams by Excalibur. 

Thanks to jcgrj, we have the 2024 McLaren MCL38 Mercedes sounds added as an option to the 2024 mod. 

Thanks to Öggo for the visor colour tweak that was recently released. 

Thanks to Gitanes for the performance pack for the entire season. 

Thanks as well to Paulo Derpich and his many updates to every car this season, bringing many track specific liveries including Alpine, Ferrari, McLaren, Mercedes, VCARB and the Williams. Great work. 

From my side, I've added a few new helmets, Lando Norris' dark helmet used at the final three races, Verstappen's USA helmet that he ran at all three American races, and I've also painted his World Champion helmet with the four World Championship stars on the rear. I've created Hulkenberg's helmet that he used at night races and Russell's white helmet that he used in Qatar. There's also Hamilton and Russell's helmets from the Abu Dhabi GP, as well as Jack Doohan's debut race helmet in the Alpine. 

The mod has also been updated with Jack racing at the final race in place of Esteban Ocon, and you'll find all the usual updates to team arts, CSM previews, performance files etc. 

Thank you all for your support in 2024, I hope you enjoy this update.

Installation Notes

This update requires 2024 F1 mod previously released on this blog here: 
https://fongugp4.blogspot.com/2024/08/gp4-f1-2024-mod-v10.html

• Download both the 2024 CSM mod updates below

CSM update - 2024 CMU24 update 6 v1.6
CSM update - 2024 CMU24 update 7 v1.6

• Open CSM
• File | Install new carset template | select F1_2024_CMU24_update6_v1.6.cmu
• File | Install new carset template | select F1_2024_CMU24_update7_v1.6.cmu

I hope you all have a great New Year, where we look forward to another exciting F1 Season as well as more progress in GP4 modding. 

Happy Racing. 

GP4: F1 2024 mod v1.5 update

The 2024 mod was only released in August, and two months later, we're already on the fifth update pack. That's in large part due to real life driver changes, but also thanks the great community pumping out quality updates to add to this mod. 

Thanks to Excalibur for his most recent update to the VCARB car, with Liam Lawson's number 30 skin now added to the mod. 

2024 VCARB by Excalibur

I've now completed the 2024 version of Liam Lawson's helmet, designed by MDM Designs and painted by BS helmets onto the Bell helmet with a solid wing. I've also added the team-art for Liam. 

2024 Liam Lawson helmet by fongu

I've also taken the liberty to add this special helmet of Franco Colapinto from the Mexican GP (and used at the Brazilian GP too). He's racing with a tribute to Carlos Reutemann's classic helmet design. I don't know about you, but it took me a while to realise the FC on the front of his helmet stands for Franco Colapinto, not some other franchise.

2024 Franco Colapinto Mexican GP helmet by fongu

Ollie Bearman once again stood in for Kevin Magnussen (this time through illness) and he wore his alternative Haas helmet. This is basically red instead of yellow, a different colour visor and slight detail changes. 

2024 Oliver Bearman Brazilian GP helmet

Lewis Hamilton had the privelege of running in a 1990 McLaren at the Brazilian GP, and ran a special Senna inspired helmet for the whole weekend. I couldn't help but add this to the collection. 

2024 Lewis Hamilton Brazilian GP helmet

As promised, my McLaren MCL38 has now been added to the mod. In the mod, there is a new selection for which McLaren you want to use, mine or Isaint's. Below is a screenshot of my version of the Monaco GP livery, the Senna tribute. 

2024 McLaren MCL38 Monaco GP by fongu

... and the Legends livery used at the Singapore GP,

2024 McLaren MCL38 Singapore GP by fongu

... and the shiny Chrome livery used at the US GP at the Circuit of the Americas (no off-track overtaking happened in the creation of this screenshot).

2024 McLaren MCL38 US GP by fongu

Thanks to Paulo Derpich and his epic work to complete all the sponsor changes on my McLaren. There's also more track specific liveries, including the Singapore GP Mercedes, VCARB liveries and the latest Williams liveries, including the yellow engine cover. There's also some cockpit updates to the Mercedes, VCARB and McLaren.
Super job! 

There was a request to add a new weather option, 33% chance of rain, so that's been added to this 2024 mod. 

Other than a missing CSM preview picture, some performance file updates and fixes, fixed alpha channels on the Red Bull, that's all for this update. 

Oh wait you want more?

I'm sharing with you my all new version of the Sauber. It's a bit less toxic green than Isaint's version, and comes with Stake and Kick livery variants. 

It's a shame the livery is so vile because I quite like the shape. Well, at least the car is pretty much confined to the rear of the grid and mostly out of sight. Anyway, the car gets its exclusive release as part of this mod update, but I do plan on releasing the car separately soon. 

2024 Sauber C44 by fongu for GP4

Well that's really it for this update. The file size suggests there's more in this mod update than there are in some mods. 

Installation Notes

This update requires 2024 F1 mod previously released on this blog here: 
https://fongugp4.blogspot.com/2024/08/gp4-f1-2024-mod-v10.html

• Download both the 2024 CSM mod updates below

CSM update - 2024 CMU24 update 4 v1.5
CSM update - 2024 CMU24 update 5 v1.5
CSM update - 2024 CMU24 update 6 v1.5

• Open CSM
• File | Install new carset template | select F1_2024_CMU24_update4_v1.5.cmu
• File | Install new carset template | select F1_2024_CMU24_update5_v1.5.cmu
• File | Install new carset template | select F1_2024_CMU24_update6_v1.5.cmu

As ever, happy racing.