For this week's “Small but Mighty” championship, FH6 Credits are best spent carefully rather than thrown at every available upgrade. The D 400 restriction leaves little room for unnecessary parts, and the Eclectic Domestics requirement narrows your choices even further. The championship is not about creating a car with impressive statistics on paper. It is about making a small, responsive machine that can stay fast through technical corners.

That is why FH6 Credits should mainly go toward upgrades that improve efficiency rather than raw power. The championship visits Shimanoyama Circuit, Edamame Circuit, and Irokawa Circuit, so braking, cornering, and acceleration out of slow turns are much more important than having a high top-speed number. Winning all three races also rewards 5 Festival Playlist Points and unlocks the 1970 Honda S800.

Start With A Lightweight Platform

The 1991 Honda Beat is the standout option for this week's event. Its compact body and low weight make it naturally suited to D-Class racing. It can rotate quickly through corners and preserve speed without needing a large amount of horsepower.

A useful community tune is available through share code 156 082 184. If you do not enjoy building tunes from scratch, this is an easy way to get started and see how the car behaves before making your own changes.

The 1970 Honda S800 is another strong candidate. Players who already own it can use its balanced chassis to good effect, particularly around the tighter portions of Irokawa Circuit.

The Toyota Sports 800 Is Worth A Look

The Toyota Sports 800 is a good alternative for anyone who wants a classic lightweight car with room for simple upgrades. Because it starts from a low-weight platform, reaching D 400 does not require sacrificing the entire build to one category.

At this level, starting with the right car is almost as important as the final tune. A heavy car can consume valuable PI just trying to compensate for its weight, while a lightweight car can turn the same PI into useful handling and power improvements.

Build The Chassis Before The Engine

The first major upgrade should usually be weight reduction. Less weight means shorter braking distances, quicker direction changes, and better control when the track becomes technical.

Choose the highest weight reduction level that fits comfortably within your PI budget. Street or Sport can both work depending on what else you want to install.

Race anti-roll bars are another excellent investment. They are particularly useful because they can reduce body roll without consuming much PI. The result is a car that feels more stable when transitioning from one corner to another.

Upgraded brakes can also be worthwhile. Street or Sport brakes should provide enough improvement without forcing you into C-Class.

Keep The Stock Tire Compound

It is tempting to install better tires, but D-Class racing requires restraint. The stock tire compound usually gives you enough grip for this championship while preserving PI for more important upgrades.

If you have one or two spare PI points, consider adding some rear tire width. That can help the car put power down more effectively when leaving slower corners.

You can also leave the transmission alone. A Sport Transmission only becomes particularly useful if you want to fine-tune the final drive for these shorter circuits.

Add Small Power Improvements

After handling and weight are optimized, use the remaining PI for power. An air filter and exhaust are sensible upgrades because they provide useful horsepower without adding a large amount of weight.

Large engine swaps are usually counterproductive here. They can make the car heavier at the front and use PI that would be better spent elsewhere. More power does not help much if you have to slow down dramatically for every corner.

The ideal D-Class car should feel responsive and balanced. You should be able to get back on the throttle quickly rather than waiting for a heavy car to settle.

Reading The Three Tracks

Shimanoyama Circuit is mainly about protecting momentum. Try not to brake too aggressively before sweeping corners. Enter smoothly and keep the car moving instead of relying on late corrections.

Edamame Circuit requires more awareness of the curbs. The transitions around the stadium can unsettle a small car, so keeping the suspension stable is more important than taking every curb as aggressively as possible.

Irokawa Circuit is the most technical track of the group. Use tight inside lines and make use of the car's low weight when braking. The AI may have more speed on short straights, but a clean corner exit can give you the advantage before the next turn.

Getting More From The Event

The “Small but Mighty” championship is ultimately a lesson in making every PI point count. A 1991 Honda Beat is the simplest choice, while the Honda S800 and Toyota Sports 800 can also work very well. Focus first on weight, brakes, and chassis control, then use the remaining PI for modest power improvements. If you are mainly interested in collecting seasonal rewards and would rather reduce the amount of repetitive driving, Forza Horizon 6 Super Wheelspins can be another way to improve your overall garage resources while you continue working toward the championship rewards.