Tech Report: X1’25 with HUDY Foam Tires

Last weekend, I dedicated my time to testing the Xray X1’25 with the new HUDY foam tires. The goal was to develop a solid baseline setup for our drivers and customers racing on carpet, particularly as these tires are gaining renewed interest in the Formula class at Hudy Series events.

With the reintroduction of HUDY foam tires, we’ve seen a surge of attention toward the Formula category. I wanted to ensure every driver has a reliable starting setup that provides confidence and competitiveness right out of the box.

Below is the setup I recommend based on my testing. The car felt very neutral and easy to drive—well-balanced and predictable. Given the already high traction level at the Hudy Arena, I opted for a solid rear axle to maximize steering and on-power acceleration.

Tire Glue Strategy – A Key Detail:

One of the most critical aspects was the glue application on the front tires. As the run progressed and traction increased, I noticed significant on-power oversteer developing toward the end of the run. To address this, applying glue not only on sidewall but also along the sidewalls proved essential.

After testing different amounts, I found the sweet spot at around 4.5mm of glue coverage over the sidewall. Less than that, the car would begin to oversteer later in the run. More than that, it became pushy and understeered excessively. For lower-traction tracks, just gluing the sidewalls might be sufficient—but I strongly recommend monitoring tire behavior during long runs. If you experience increasing oversteer after a few minutes, adjusting the front tire glue is a quick and effective solution.

Chassis Comparison – Carbon vs. Aluminum:

I tested both the carbon and aluminum chassis options. Performance-wise, lap times were nearly identical. However, the aluminum chassis offered more consistency in high-traction conditions. That said, the carbon chassis was still competitive and just as easy to drive. So, if you're coming from asphalt and only have the carbon chassis, don’t worry—you’ll still be fully competitive.

Additional Setup Notes:

I ran maximum front droop to calm down the steering response and improve stability through chicanes.

I also compared different front wings and found the Ehrbar Engineering wing provided the most neutral handling, making the car even easier to drive.