How to Tune Cars – Forza Horizon 6 Tuning Guide

The catch of tuning is the class brackets. Downloading a tune rated above the race’s PI cap will lock the car out of the event, so always check the tune’s Performance Index before applying it. Pick a tune built for the exact class you plan to race in.

The rest of this guide covers what to do when a downloaded tune is not enough, how to manually tune a car for grip and pace, and what every slider in the fine-tune menu actually does. Skip ahead to any section using the table of contents, or read in order to build a full tuning mindset from scratch.

Quick Tunes

If you just want a car that works and don’t want to read the rest of this guide, the table below is your shortcut. Three rows ship with verified community share codes you can drop straight into Forza Horizon 6. The rest are class-leading picks where any top-rated community tune in the relevant bracket will keep you on pace.

The MX-5 Forza Edition and BRZ Forza Edition are fairly easy to obtain cars, and I generally don’t advocate for paid cars that cost over 25$ so I’ve tried to steer clear of those. Most of the cars above are brought from the Autoshow and pulled from Wheelspins.

The Easy Way: Download a Community Tune

Most players never need to build a tune from scratch. Forza Horizon 6 lets you download community-uploaded tunes for almost any car. For a player who just picked a specific car to run a specific race, this is the fastest path to a competitive setup.

Open the car in your garage, head into the Upgrade and Tune menu, and browse shared tunes. Sort by likes or downloads, pick a top result that matches the class you need, and apply it. The car is now ready to race without touching a single slider. Alternatively, pressing Y or Backspace allows you to find tunes by class or search bar.

The Class Bracket Warning

This is where most new players get caught. Every race in Forza Horizon 6 has a class restriction. A B-Class Road Race will not let you start the event in a car rated A-Class or higher, even by a single Performance Index point.

When you download a tune, check the PI value at the top of the screen before saving. If the tune you picked is built for S1 but you wanted to run B-Class events, the car will be locked out. Always filter shared tunes to the class you actually need. Generally, you’ll want to get to the next hundredth value, for example, from 434 to 500 would mean that the car stays in the same bracket (or the next hundred (600) would mean that the car is the top of the next bracket)

When a Downloaded Tune Is Not Enough

Shared tunes cover most casual use. But community tunes are built for specific driving styles, and the top result may not match how you actually drive. If a downloaded tune feels twitchy, understeery, or unpredictable, the rest of this guide explains exactly what to change to fix it or make your own.

Tuning Mindset: One Variable at a Time

The single biggest mistake new tuners make is changing five settings at once. If the car feels better afterward, you have no idea which change actually helped. If it feels worse, you have no idea which change broke it. This primarily applies to Custom Tunes.

Pick one setting, make a small adjustment, then drive the car. Decide if the car feels better, worse, or the same. Then move to the next setting. This primarily applies to drift builds, but can apply to racing / off-road / challenge-specific tuning.

Upgrades Before Tuning

You cannot tune what you have not installed. Several upgrades exist solely to unlock tuning sliders; without them, the fine-tuning menu will be greyed out. Always install these before opening the tune menu.

Required Tuning Unlocks

Build Order

Work from the bottom of the upgrade menu up. Start with Conversions because engine swaps and aspiration changes replace any earlier engine upgrades, wasting the PI spent on them. Body kits also belong early since some unlock wider rear tires and adjustable front aero.

From there, run as much weight reduction as you can afford. Weight reduction is one of the most PI-efficient upgrades in the game, helping acceleration, braking, and cornering all at once. Power upgrades should fill out whatever PI remains.

Tire Pressure

Tire pressure is the simplest tuning category and a good place to start. Lower pressure gives more grip but feels softer. Higher pressure gives a sharper response, but can lose grip if pushed too far.

For all-wheel-drive race builds, start at around 28 PSI front and 27-28 PSI rear. For rally tires, run softer, around 21 to 26 PSI. For semi-slicks and slicks, run slightly higher, around 30 to 32 PSI.

Gearing

Gearing controls acceleration versus top speed. The fastest way to set it is to open the Final Drive slider and check the speed graph in the bottom right corner. Move the slider so the line just touches the right edge of the graph, meaning the car will barely hit top speed at the end of the longest straight.

If the car is bouncing off the rev limiter too early on straights, move Final Drive toward speed. If the car feels weak accelerating out of corners, move the Final Drive toward acceleration. For most races, leaving the individual gears alone and adjusting only the final drive is enough.

For cars with a strong top-end power band (like the Lamborghini Huracan, which makes peak power near 8500 to 9000 RPM), lengthen first gear slightly to avoid hitting the limiter immediately off the line.

Alignment

Camber

Camber is the angle the wheel leans inward at the top. Negative camber improves cornering grip but reduces braking and acceleration grip when driving straight. For most all-wheel drive race builds, start at -1.5 to -2.0 on the front and -1.0 to -1.5 on the rear.

If the car refuses to turn in, add slightly more negative camber to the front. If the rear feels loose, reduce negative rear camber. Stay between -1 and 0 for most setups unless you are chasing an extreme tune.

Toe

Toe is the last resort, not the first stop. For almost every race build, leave toe at zero or extremely close to zero. Tiny amounts of front toe-out (0.1 to 0.2) can sharpen turn-in if the car still refuses to rotate, while small amounts of rear toe-in add stability.

Caster

A higher caster gives more stability and better cornering grip. For racing, run caster high, between 5.5 and 7.0, with 6.5 to 7.0 being the most common starting point. Drop it slightly only if the steering feels too heavy.

Anti-Roll Bars

Anti-roll bars (ARBs) control how the car leans through corners and how grip is balanced between the front and rear. Softer means more grip on that axle. Stiffer means less grip but sharper response.

For all-wheel drive race builds, max ARBs (around 165 front and rear) are often a fast starting point. From there, adjust based on behavior. If the car understeers, soften the front or stiffen the rear. If the car oversteers, soften the rear or stiffen the front.

Historically, the heavier a car is, the better off-road the car can handle – this is because the car doesn’t bounce as much, so for maximum off-road builds, this is useful.

Springs and Ride Height

Spring Stiffness

Springs in Forza Horizon 6 work counterintuitively. Many fast all-wheel drive race builds run very soft springs, often close to the minimum on both axles. Softer springs help the tires stay planted and increase mechanical grip.

The default spring distribution should match the car’s weight distribution. If the car carries 55% of its weight at the rear, the rear springs should be stiffer than the front springs by the same ratio. The garage menu shows the front-rear weight split.

If the car oversteers out of corners, stiffen the front springs and soften the rear. If the car understeers, do the opposite. If the car feels bouncy or sloppy, stiffen both slightly.

Ride Height

Lower ride height improves cornering, but too low causes the car to bottom out and lose grip over bumps. For most race builds, run it low but not slammed. Some setups also benefit from a higher front and lower rear, which trades stability for top speed and rotation.

Damping

Damping controls how fast the suspension reacts. Rebound is how quickly the suspension extends back out. Bump is how quickly it compresses down. Rebound should almost always be higher than bump.

A solid starting point is 18 rebound front and rear, with 6 bump front and rear. For softer overall setups, raise rebound up to 20. If the car feels twitchy or harsh, lower the rebound slightly. If it feels lazy or floaty, raise it.

If the front feels too stiff entering corners, drop front damping. If the rear feels unstable, drop rear damping. Adjust springs before damping, since damping cannot fix a fundamentally wrong spring setup.

Aero

Aero is the easiest way to gain cornering grip, but it comes at the cost of straight-line speed. The classic setup is maximum front downforce paired with minimum rear, giving the most grip with the least drag. Horizon 6 has shifted slightly, so balanced aero now matters more.

For time attack and circuit racing, run high downforce on both ends. For sprint racing and open-road events where top speed matters, run lower downforce overall. Aim for a front-rear aero balance around 0.40 to 0.45 as a starting point.

If the car understeers at high speed, add front aero. If the rear keeps sliding at high speed, add rear aero. Watch top speed when raising downforce, since too much aero kills straight-line pace.

Brakes

Brake balance shifts braking power between the front and rear. Moving the slider toward the front gives more stability under braking. Moving it toward the rear helps the car rotate into corners but can cause spins if pushed too far.

A safe starting point for most road race builds is 48% to 50%, slightly rearward of centre. This gives a little extra rotation for trail braking without losing the back end. Be precise: a single percentage point makes a noticeable difference, so adjust one click at a time.

Brake pressure controls how hard the brakes bite. Leave it at 100% for most builds. If the tires lock up too easily under heavy braking, drop pressure slightly. If braking feels weak, push it higher.

Differential

The differential controls how the wheels share power. For grip builds, the goal is to put power down without spinning out, while allowing the wheels to rotate at slightly different speeds through corners.

Acceleration Lock

Higher acceleration lock gives more traction out of corners but can cause understeer when accelerating. For all-wheel drive grip builds, run 100% on both front and rear acceleration. For rear wheel drive, start at 50% to 60% and raise it if you can manage the throttle.

If the car understeers heavily when accelerating, drop acceleration lock. Going above 95% can sometimes restrict turn-in, so back it down if cornering suffers.

Deceleration Lock

Lower deceleration lock helps the car rotate into corners when lifting off the throttle. Start at 0 and raise it slightly if the car feels unstable on corner entry. For Rear Wheel Drive cars, 10% to 20% is a typical range.

Center Balance (All-Wheel Drive Only)

Center balance controls how much power goes to the rear wheels. Higher values send more power rearward, making the car feel more like a Rear Wheel Drive build. Most all-wheel-drive grip setups run a 70% to 85% rear bias.

If the all-wheel-drive car feels boring and refuses to rotate, increase the rear bias. If it slides too much on power, lower it. Never drop below 50%, and most builds settle somewhere between 60% and 90%.

Tuning Workflow Summary

Frequently Asked Questions