Tune builder
Plan a Forza Horizon 6 build part by part. Load a proven starter, weigh what each upgrade changes, and read a live telemetry summary of where your car is heading, then copy a sheet straight into the in-game upgrade menu.
Once your parts are on, get slider baselines from the tuning calculator, or learn what every setting does in the full tuning guide.
- 6
- Starter builds
- 9
- Upgrade stages
- 0
- Fabricated stats
Start from a proven build
Load a common competitive starting point, then adjust any part below. These are directions, not fixed setups, so confirm the numbers in game.
This advisor shows which way each upgrade moves your car, not simulated PI or stats, because those change with patches. Arrows and the telemetry read show direction only. Confirm the real numbers in the in-game upgrade menu.
Aspiration
How the engine breathes. Forced induction is the biggest single power lever and the cheapest way up the PI ladder.
Engine swap
Changing the engine itself. Swaps unlock power a stock block cannot reach, but they move weight around.
Drivetrain swap
Which wheels get the power. This reshapes how the car puts power down and rotates more than almost any other part.
Tyres and compound
The single biggest grip lever. Compound sets how much mechanical grip you have before any tuning.
Brakes
Often skipped, and newly important in FH6.
Transmission
Gearing and shift behaviour.
Differential
How locked the driven wheels are, which controls rotation on and off throttle.
Weight and chassis
Less mass and a stiffer shell help every part of the lap.
Aerodynamics
Downforce trades top speed for cornering grip, and shifts balance front to rear.
Build console
0/9Load a starter build or pick parts on the left. Your build reads, telemetry and a copyable sheet appear here.
Frequently asked
Does the tune builder calculate PI?
No, and that is on purpose. It does not simulate Performance Index or stat numbers, because those shift with game patches and anything we showed would be guesswork. Instead it explains what each upgrade does and which direction it moves power, weight, grip and PI, then you confirm the exact numbers in game.
Where do the starter builds come from?
They are common competitive starting points for each discipline, road, rally, dirt, drift and drag, assembled from general Forza tuning knowledge. They choose the parts, not an exact PI. Load one, then swap any part and confirm the numbers in game, because the best drivetrain and engine choice depends on the specific car.
How is this different from the tuning calculator?
The tune builder helps you decide which parts to fit. The tuning calculator gives you slider starting points for springs, dampers, anti-roll bars and the rest once those parts are on the car. Use the builder to plan the build, then the calculator to set it up.
What does it get right about Forza Horizon 6 specifically?
Brakes now matter and weak stock brakes can lock a wheel on downshift, a race transmission removes clutch behaviour even if you drive manual with clutch, the 6.2L V8 swap is roughly 100 lb heavier than in FH5, and the rally differential often feels better than the race diff on road. Each of these is flagged on the relevant upgrade.
Sources
Upgrade guidance is general Forza tuning knowledge cross-checked against these references. Last reviewed 2026-05-29.