XRAY X12 Tech Tips for GT12 class by Adam Izsay

Over the past weekends, I participated in two different races in the GT12 class with my all-new XRAY X12, using foam tires to gain insights and gather setup information, which I would like to share.

First Race: Hudy Series Slovakia at Hudy Arena

The first race took place at the Hudy Series in Slovakia, held on a high-traction track with grey ETS carpet. I began with a setup close to the kit specifications but made several adjustments to enhance the outstanding performance of the new X12’25 in the GT12 class.

To improve cornering speed, which was crucial for this fast and flowing track, I increased the front kingpin oil from 10K to 15K. This change significantly enhanced cornering speed and made the car less reactive initially. Following this, I moved the battery all the way forward, further improving the car's driveability.

I also wanted to experiment with the center shock oil, so I tested several viscosities and ultimately preferred 400cst. This choice provided excellent on-power stability while maintaining good rotation into the corners. After these adjustments, the car felt phenomenal and easy to drive, but I was still eager to refine it further.

Next, I experimented with increasing the rear pod angle, settling on 4mm, which provided greater rear stability and allowed me to hit the chicane entries confidently without worrying about losing the rear end. To enhance side bite and reduce initial steering, I switched to the optional 1mm side braces and, later during the race, adjusted the front kingpin to 1.5 degrees, improving cornering in tight situations.

By the end, the car handled so well and felt effortless to drive that I was able to achieve lap times close to those of top modified touring car drivers, all while using a handout fixed timing 13.5T motor.

Second Race: Hudy Series – MR Cup, Czech Republic

The following weekend, I attended the next Hudy Series – MR Cup, this time in Jedovnice, Czech Republic, where the track featured much lower traction due to a black ETS carpet. I started with the same setup as before but quickly realized that I needed to improve rear traction and stability to adapt to the low-traction conditions.

To address this, I first moved to the longest pivot, which significantly enhanced rear traction and overall driveability. I then switched to softer C0.5 side springs and widened the rear of the car by 2mm; both adjustments contributed to improved side traction and made the car much easier to handle in low-traction conditions.

While the car already felt good, I wanted to reduce some steering compared to Hudy Arena. Therefore, I adjusted the caster from 3mm to 2mm, making the car less reactive, and changed the kingpin to 1 degree to alleviate low-speed steering. By the end of the adjustments, my car felt perfect, and I thoroughly enjoyed driving around the track.

Throughout both races, I utilized the new HUDY Adjustable Servo Saver with the shortest link position to maximize Ackermann and corner speed—this setup is highly recommended.

Additionally, I modified the standard X12 body posts by replacing them with the X4 front body posts to fit the body at the correct height. I moved the front posts from their standard position to the bumper holder holes, bringing them closer together and allowing them to fit precisely on the motor hood of the Superkura bodyshell I was using.