Guerilla Mods GT4 0.5 – Breakthrough Mod For Assetto Corsa?


Terry Farish
Terry Farish
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*Featured Image thanks to Alisa Long

The Guerilla Mods GT4 version 0.5 has just been announced and is downloadable now!

Including some future-proofing fixes for the latest BETA version of CSP ( Custom Shaders Patch ), we’ll be using this pack as part of our GT4 championship and our 4hr of Nordschleife multi-class endurance event, we tested them and detailed how they handle, read on to find out what we thought, it may help you choose your car for the championship!

The official changelog, by Guerilla Mods themselves is:

ready for rain

bop tweaks

fixed fuel usage

tweaked csp extensions

new mapping for windows (skinnable)

small bug fixes

big thanks to Barbiche Bsa for his dirt textures cars will get dirty now!

new light settings (made by malaka Marcel Erner)

Posted by Timo Ha on

Ready for Rain

If you’ve been keeping up to date with the latest developments on the Custom Shaders Patch for Assetto Corsa, you may already know that they’re working on bringing full rain effects to Assetto Corsa, with rain on the windshield and wipers clearing it away, a much-needed update and one that requires modders to change the way their mods work to include this update.

Currently in the beta phase of Custom Shaders Patch, the rain will be one to look out for, for now, we have a video of it in effect on the Audi R8 around Nordschleife, if you’re looking how to get this working, you can find more information over at Ilja’s Patreon at

Audi R8 GT4 Rain Physics | Guerilla Mods GT4 0.5 | Assetto Corsa

BOP Tweaks

The Guerilla Mods GT4 0.5 brings some new BOP (Balance of Power) tweaks which are going to play a large part in our GT4 Championship and our resident Works Racing Driver Ramarra has taken all of the cars out around Oulton Park Island to give us a little bit more information on how all of these cars are balanced, more on that later.

Fixed Fuel Usage

Without having access to the previous fuel usage parameters, we’re unable to determine just how much change was issued but we’ll soon know after the GT4 Championship is complete!

Guerilla Mods GT4 0.5 – All Cars Tested

Let’s have a little delve into what our Works Racing Driver Ramarra thinks of the latest update after he took them around Oulton Park International, the host of our first round ahead of Season one of our GT4 Championship.

*All lap times are set using default setups and are “consistent” lap times, not the ultimate pace of the cars.

Aston Martin Vantage

Aston Martin Vantage GT4 - Guerilla Mods GT4
Aston Martin Vantage GT4 – Guerilla Mods GT4

Reference Lap 1:45.532

The Aston Martin Vantage is a typical front-engined car, initially, it turns in well but then gets washed out into understeer, the overall handling is Neutral/Understeer.

There are a few bugs present with the car, the dash is currently very pixelated and does not work unless you enable the lights, the gearing page of the UI also quotes the top speed as 400kph.

“Overall the Aston Martin Vantage is a very beginner-friendly car. It does nothing to surprise the driver with natural front-engined behaviour. Trail braking improves corner performance and ABS can be reduced to help with braking distance.”

Ramarra on the Aston Martin Vantage GT4 from Guerrilla Mods

Audi R8

Audi R8 GT4 - Guerilla Mods GT4
Audi R8 GT4

Reference Lap 1:44.995

The Audi R8 is a well-balanced car during cornering, it responds well to inputs but can become nervous under harsh inputs and braking, the overall handling is balanced, to slight oversteer.

No bugs were present during the testing of this car.

Out of the box, the Audi R8 is a capable and quick car. It can become nervous with an inexperienced driver but anyone with knowledge can use the car characteristics as an aid to gain lap-time.

Ramarra on the Audi R8 GT4 from Guerrilla Mods


BMW M4 GT4 - Guerilla Mods GT4

Reference Lap 1:45.096

The BMW M4 is a Large front-engined car, due to this it requires wrestling into corners, the braking performance in the default state is lacking and if quick on the power it has a tendency to oversteer due to short gearing in the lower gears. The overall handling is generally balanced to understeer, although as mentioned above, oversteer can be induced.

There was a bug present with the dash not displaying any information.

“The BMW M4 is a fairly beginner-friendly car, however, the weight and braking performance may take some getting used to especially into corners requiring trail braking.”

Ramarra on the BMW M4 GT4 from Guerrilla Mods

Chevrolet Camaro

Chevrolet Camaro GT4 - Guerilla Mods GT4
Chevrolet Camaro GT4

Reference Lap 1:44.876

The Chevrolet Camaro is a car you can really feel the weight of, typically the handling is more leaning towards understeer but due to the inertia of the body during corners and under braking, can also cause oversteer.

No bugs were observed during the testing.

“The Chevrolet Camaro is a torque driven car with long gears, it’s beginner-friendly although the body movements during cornering and braking could take a less experienced driver by surprise.

Smooth driving certainly helps with this beast!”

Ramarra on the Chevrolet Camaro GT4 from Guerrilla Mods

Ford Mustang

Ford Mustang GT4 - Guerilla Mods GT4
Ford Mustang GT4

Reference Lap 1:44.667

The overall cornering of the Ford Mustang is very similar to the Camaro, although a bit more nervous during heavy braking into corners, there’s generally understeer mid corner but can slide with harsh acceleration.

No bugs were observed during testing.

“The Ford Mustang is a big, loud, American muscle car! Quick if you can manage the weight transfer but you have to be careful with heavy braking into corners.”

Ramarra on the Ford Mustang GT4 from Guerrilla Mods

KTM Xbow

KTM X-Bow GT4 - Guerilla Mods GT4

Reference Lap 1:44.866

The overall cornering of the KTM Xbow is light and very responsive, although you need to watch out for the lift off oversteer. This car is very well balanced but needs good pedal control.

No bugs were observed during testing.

“In the right hands, the KTM Xbow is a little pocket rocket capable of quick times. However you do need good pedal control otherwise you may find yourself heading towards the nearest tree far quicker than you would want!

Not recommended for beginners.”

Ramarra on the KTM Xbow GT4 from Guerrilla Mods

McLaren 570s

McLaren 570s GT4 - Guerilla Mods GT4
McLaren 570s GT4

Reference Laptime 1:44.238

The overall handling of the McLaren 570s is well balanced with a hint of oversteer in the fast corners, making this a very beginner friendly car.

The following bugs were present during the testing however, the rev lights and bar don’t fully work on the dash.

“The McLaren 570s is a mid-engined car perfect for beginners, it does nothing surprising to the driver but is still quick.

It’s a good choice for beginners and experienced drivers alike.”

Ramarra on the McLaren 570s GT4 from Guerrilla Mods

Mercedes AMG

Mercedes AMG GT4 - Guerilla Mods GT4
Mercedes AMG GT4

Reference Laptime 1:44.024

The Mercedes AMG is very similar in overall handling to the Aston Martin, it’s a predictable car that doesn’t have the understeer that the other front engined cars suffer from, allowing it to be balanced.

No bugs were observed during the testing.

“In my opinion, the Mercedes AMG is the car for beginners, it doesn’t do anything surprising, brakes well, corners well and is overall a great car.”

Ramarra on the Mercedes AMG GT4 from Guerrilla Mods

Porsche Cayman

 Porsche Cayman 718 GT4 - Guerilla Mods GT4
Porsche Cayman 718 GT4

Reference Laptime 1:45.355

The Porsche Cayman is responsive throughout all phases of the corner, careful brake usage, however, is required as it will try and swap which end is pointing towards the exit with harsh inputs. The overall handling is neutral with good pedal control.

No bugs were observed during the testing.

“Like it’s brother the Porsche 911 GT3, the Porsche Cayman is a very nimble car and does what the driver wants. This comes at a cost however, with harsh inputs during braking or steering, it is unforgiving and will bite.

The Porsche Cayman can also be nervous on bumps and crests due to the weight distribution, although if you get it right, you will win!”

Ramarra on the Porsche Cayman GT4 from Guerrilla Mods

Saleen S1

 Saleen S1 GT4 - Guerilla Mods GT4
Saleen S1 GT4

Reference Laptime 1:44.866

The Saleen S1 is the Jekyll and Hyde of the Guerilla Mods GT4 pack, keep your foot planted and it will love you, lift off and you will make a beeline for the nearest hedge, this a car which has extreme oversteer off the throttle and nervous under heavy braking.

No bugs were observed during the testing.

“The Saleen S1 is not a car for beginners, to get the most out of the car, constant throttle balancing is required through the corner and fine control during trail braking.

Setup work can make it more user friendly, but it will surprise you if you let it.”

Ramarra on the Saleen S1 GT4 from Guerrilla Mods

Toyota Supra

image 11
Toyota Supra GT4

Reference Laptime 1:45.054

The overall handling of the Toyota Supra GT4 from the Guerilla Mods GT4 pack is generally balanced on the throttle, the car is fairly nimble and likes to have power during cornering, the front of the car feels very snappy off the throttle.

“The Toyota Supra GT4 is a quick little addition to the GT4 roster, although the implementation is a little confusing.

The front feels very floaty and I’m unsure if that’s a physics issue or just the general car handling, if that’s how you like your cars to feel, then it’s a good choice!”

Ramarra on the Toyota Supra GT4 from Guerrilla Mods

Current Bugs from Guerilla Mods – 19/08/2020

BMW M4 GT4 – automatic shifting issues between second to third and third to fourth gear

Tyre change & refuelling times adjusting on all cars for pitstops

Windshield dirt reducing

no outside engine sound from KTM X-Bow GT4

Dash displays reflect the light too much, they can not be read

Dirt textures rework of all cars

BMW M4 no engine sound if the BMW drives toward

BMW M4 street tyres need to be changed to slicks

Posted by Timo Ha on


We didn’t experience all of the bugs present in the pack from the Facebook page during our testing, but from putting in some clean, smooth and consistent laps, all of the cars were within one second of each other around Oulton Park International, the first round of our GT4 Championship, we can’t wait to see them all out on track.

Let us know in the comments below what’s your favourite car of the Guerilla Mods GT4 pack!


You can grab the latest version of the Guerilla Mods GT4 0.5 from the Guerilla Mods facebook page at

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