Final drive versus individual gears
The final drive is a master control: raise it and every gear gets shorter for acceleration, lower it and they all get longer for top speed. The individual gear ratios then fine-tune the spacing. Start with the final drive, then space the gears.
Why the 10-speed is meta
A 10-speed race gearbox is one of the best value upgrades in the game. More ratios mean the engine stays closer to peak power at all times, and each shift drops fewer revs, so you lose less time changing gear. It is cheap PI for a real, repeatable gain.
A final drive starting point
Use this as a baseline, then adjust on track: final drive equals 4.25 plus 400 minus your horsepower, divided by 6, times 0.01. For very high power builds the figure is capped so it does not swing wildly. Then tune to the track.
- Aim to hit the rev limiter right at the end of the longest straight.
- On fast circuits, lengthen the final drive by 0.2 to 0.3.
- On tight technical circuits, shorten it by the same.
- Shorten first gear slightly if you bog off slow corners.
Discipline differences
Not every event wants the same gearing.
- Drag: tune first gear on the strip for a hard launch with controllable wheelspin, and set top gear to reach trap speed.
- Off-road: shorten everything for acceleration between obstacles, you rarely reach top speed.
- Drift: close-ratio gears so you can hold the redline in third and fourth through a slide.
Frequently asked questions
Is the 10-speed gearbox worth it in Forza Horizon 6?
Yes. More ratios keep the engine in its power band and cut the dead time between shifts, for very little PI. It is a meta pick on almost every build.
How do I set the final drive?
Start from the baseline formula, then adjust so you hit the rev limiter at the end of the longest straight. Lengthen it on fast tracks, shorten it on tight ones.
Why is my car bouncing off the rev limiter?
Your gearing is too short. Lengthen the final drive or the top gears so the car reaches the end of the straight just as it hits the limiter.
What gearing should I use for drift?
Close-ratio gears so you can hold the redline in third and fourth through a typical slide, with the final drive set to keep you in the power band during transitions.
Put this into practice: the FH6 tuning calculator builds a full setup for any of 630 cars, and the meta cars list shows what to build first.