A Tuners Guide To Forza

A lot of Forza players tend to shy away from manually tuning their vehicles because they find it either to complex or to time consuming. Either way they are losing out on some valuable skills within the game.

Here at ForzaTuner.com we want all players to have the tools available to become true masters at tuning, which is why we have wrote a detailed breakdown to tuning your vehicle.


When you think about driving you need to think about tyres, after all they are the only thing in contact with the road. The correct setup is highly important when it comes to cornering or when launching from the start line.

Rims are the most crucial selection when it comes to tyres. A bigger rim tends to effect acceleration for builds that are grip focused and are in theory for cars with more power to deal with weight to acceleration. Where you have the power to overcome weight to acceleration issues, bigger rims on the front of a vehicle can help when turning into corners, and help acceleration when placed onto the rear. However to big on the rear can generate instability. As such when you have the power available to accelerate without any lag or slowdown placing 18 - 20 inch rims on the front and 15 rims on the rear can help dramatically where lots of corners are within the race type.

The reasoning behind this theory comes down to the fact, bigger rims typically hold speed better, this is even more true when it comes to lighter vehicles, where it can increase handling and stability by adding extra weight to the overall calculation. However! Placing too big of a rim will kill acceleration, so it's important to find the correct balance.

In most circumstances it's perfectly fine to leave the tyre as is, unless you are looking at modifying the overal PI (Class Number) within the game.

“Bigger Rims on Lower Weight Vehicles Can Help with Handling and Stability”


You can adjust transmission settings when you swap over to Race transmission within vehicle upgrades menu. This is highly recommended as it's the first aspect of tuning whereby you can increase overall speed or acceleration

The final drive of your vehicle allows you to choose between top speed or acceleration. The simple theory is that a higher final drive will give your vehicle more acceleration but will cause your vehicle to bottom out, this means your vehicle will typically not reach it's high end top speed. Visa versa a lower final drive will increase the top speed of the vehicle but typically leads to slower acceleration.

ForzaTuner.com gives you 3 options to choose from when tuning your transmission

This gives you a balance between acceleration and top end speed.

This gives you good acceleration, however may reduce the top end speed your vehicle will reach.

This gives you good speed, however may reduce the acceleration performance.

ForzaTuner.com takes into account the lose of acceleration and or speed, and will rebalance your gear ratio in attempt to give you best of both worlds, however it is recommend that you adjust the final drive even after calculation to best suit your requirements.

“Higher Final Drive = Better Acceleration - Lower Final Drive = More Speed”


Alignment of your tyres will affect the grip of your car when driving in a straight line or cornering. A negative camber reduces understeer, increases grip when cornering but can make your car unstable driving in a straight line. A Positive camber decreases oversteer, but can also make the car unstable.

When tuning it is best practice to add only a small amount of postive or negative camber to keep your tyres aligned equally, with other fine adjustments made to your optimum setup. Forza Turner will calculate the best settings for you in respect to the driving type required, we don't recommend changing these calculations unless you want to fine adjust them.

Modifying Toe settings will lead to your car becoming more responsive upon corner entry. Remember a Toe-in will increase overall stability of your car but will most likely result in a decrease in response when turning into a corner. Toe-out will increase the responsiveness when turning into a corner but will most likely cause your car to become unstable.

Our recommendation is to avoid maximum toe-in and toe-out to help avoid too much tyre wear.

Modifying the caster angle increases your straight line stability when driving, and is recommended when tuning supercars. High caster angles will enable you to use less negative camber, which results in better acceleration and braking. Low caster angles means you will likely have to increase negative camber to provide more grip or your have difficulty controlling your car whilst driving.

Forza Tuner will provide you with the ideal settings for all the above, we recommend that you only modify these settings if you require more control over your cars stability.

Anti-Roll Bars

The purpose of Anti-Roll bars is to provide more stability in cornering. They work by reducing the amount of body roll within corners. Finding the proper calculations is highly important, as badly tuned Anti-Roll bars will effect the performance and handling of your car!

Oversteer can be achieved by stiffening the rear Anti-Roll bars, however to stiff and the rear wheels can lift of the ground whilst cornering tightly which can result in your car flying off the track! Visa Versa softening the rear Anti-Roll bars reduces oversteer, resulting in easier handling whilst cornering.

Forza Tuner uses an algorithm to make sure your Anti-Roll bars are tuned appropriately for the race type required, we don't recommend changing the values from those given by the calculator!


The springs of a car controls the weight transferred when accelerating, braking and cornering.

Front springs when stiff help transfer more weight across the car, however if you set these too stiff, it can result in a lose of grip when the car is under heavy load. Softer front springs will help increase front grip, however will result in understeer.

The same applies to the rear springs, increasing stiffness will transfer more weight across the car, but will result in a lose of grip in the rear tyres when under heavy load. Softer rear springs will again increase rear grip, however will result in the rear not exiting the corner as smoothly.

Making springs too stiff can also result in the car bottoming out under heavy braking!

Forza Tuner as with Alignment, will calculate the ideal settings for your springs, we don't recommend changing the figures given by the calculator.

Ride Height

Adjusting your car height improves overall handling.

Lowering your cars height, lowers the center of gravity thus improves handling. However if you lower your car too much, this can result in your car becoming uncontrollable.

Our calculator gives you the ideal settings required, without compromising handling. The ideal setting helps to keep your car under control but at the same time prevents your car from bottoming out.

It is recommended to set your cars height to that given by the calculator!


Downforce can help you keep better contact with the road, whilst heating up your tyres more efficiently. This can result in overall improvement with handling.

Increased downforce results in better contact with road, however too much can create excessive drag, which results in reduced top speed.

Forza Tuner doesn't calculate these settings as the base settings from within Forza are typically best suited, if fine adjustments are required the player themselves will know what style driving they prefer.


Braking is an important factor when driving. Obviously you want brakes to work when you need them. Not only can brakes help prevent accidents, they can provide a degree of handling. Adjusting the brake balance on your car is highly important in helping maximise the performance of your brakes.

Changing the brakes balance to the rear of the car increases oversteer but decreases stability. Moving the balance to the front of the car increases understeer whilst increasing stability, however it can lead to even more understeer being added when under harsh braking.

Therefore it is highly important to find the correct level of compromise within the brakes tuning, otherwise your braking distances can increase, resulting in slowing you down within a racing.

Forza Tuner takes into account the weight of your car, the speed of your car, and also the race type to provide you with the most optimal brake settings, we therefore recommend you don't change the settings given.


Now you know more about how tuning works, we hope you have better insight on how our calculator works. In order to use our calculator you only need to upgrade a few parts below we provide the minimum parts required:

1. Transmission and Gears
2. Race Brakes
3. Springs (Rally, Race, Drift)
4. Tyres (Optional)
5. Drive Train (AWD, FWD or RWD - Optional)

We highly recommend whilst upgrading your car, that you try to upgrade to the highest figure within a given class, as example (A-800, S1-900, S2-998), a bad upgrade choice would be (A-790, S1-890, S2-990) this is because expert tunners will always try to max out the car with parts to the highest PI figure within a given class.

Thanks for reading.