Race Cup as the natural environment for RST Racing

RST Racing was created out of the need to connect design, production and practical verification on track. We do not want to build parts based only on catalogue assumptions. We want to test them where the car works under real load – through corners, under braking, during power transfer and in conditions that quickly reveal the limitations of factory components.

That is why our presence in Race Cup is a natural step for us. On the RST Racing page, we emphasize that we focus on conscious drivers and teams for whom durability, repeatability of results and safety matter. The American Muscle segment is especially important to us – cars in which factory solutions often stop being enough once fast track driving begins.

Mustang GTM – a project that had to start with data

The first Race Cup round at Silesia Ring was planned for us as the baseline verification moment for the Mustang GTM. The car was meant to go out on track before receiving the full package of our own modifications, in order to check how the factory S550 platform behaves in limit conditions. The goal was to collect data, observe the car’s behaviour and build a reference point for future changes.

This approach reflects the Restomotive philosophy very clearly. We do not start with declarations that something works. First, we test the baseline. Then we analyse the weak points. Only after that do we implement solutions. In the case of the GTM, this meant testing the factory platform, analysing the logs and preparing the ground for the car’s final specification.

The tests at Silesia Ring ended earlier than we had expected, but they did not stop the project. Quite the opposite – they gave us solid material for analysis. In the publication released after the event, we explained that the objective was to identify the critical point of the factory Mustang platform, and that the incident itself provided valuable data for the further development of the GTM.

The key conclusions concerned several areas: traction management at high power, the limitations of the factory suspension geometry, torque transfer and the need for greater vehicle control in limit situations. Under high lateral load, the factory suspension revealed limitations that the GTM project is intended to eliminate through adjustable components, better tyres, tailored calibration and solutions that improve both safety and chassis rigidity.

For us, that moment was not the end of the story. It was the beginning of the next stage. Motorsport is not about avoiding difficult data. It is about knowing how to use it.

GTM rebuild – a stronger foundation for the return to the track

After the incident, the Mustang GTM went to Race Rush Garage, where the first stage of the rebuild began. The decision to work with Race Rush Garage was driven by their approach to safety, body structure and fabrication. The rebuild was not treated as a simple repair, but as the creation of a stronger foundation for the car’s new specification.

As part of the work, the body shell was mounted on a repair frame to verify the nominal chassis reference points. Structural analysis led to the decision to replace the frame rails, and the entire process is intended to restore – and ultimately increase – the stiffness of the car’s front end. At the same time, Restomotive components are being prepared, including suspension parts that will become part of the further evolution of the GTM project.

A key stage of the rebuild is also the preparation of the body for a full safety cage compliant with FIA specification. This element is intended to improve both safety and structural rigidity – two fundamental areas for a car being developed with track use in mind.

PLN 100,000 prize pool from Restomotive

Our presence in Race Cup does not end with the GTM project. In the 2026 season, Restomotive is allocating PLN 100,000 to the prize pool within the Race Cup series. The prizes will take the form of vouchers for RST Custom services and products available in the Restomotive store.

The prize pool is divided as follows:

American Car Class – PLN 70,000
1st place – PLN 50,000
2nd place – PLN 15,000
3rd place – PLN 5,000
Open Class – PLN 20,000
“Dzikus” Bonus – PLN 10,000

This is real support for drivers who develop their cars, invest in competition and help build the American Cars community in Poland. For Restomotive, it is also a natural way to strengthen the class that is closest to our area of specialization.

Race Cup calendar – a season of diverse tracks

The Race Cup series includes rounds at various venues across Poland. The calendar features, among others, Silesia Ring, Tor Poznań, Tor Kielce and MotoPark Ułęż. Each of these tracks places different demands on both the car and the driver – from fast sections, through technical parts, to changing grip conditions.

For RST Racing, this variety has significant value. It allows us to look at the development of the car more broadly than through the lens of a single track configuration. This is especially important for the GTM project, which is intended to be not only impressive, but above all repeatable, predictable and effective in track conditions.

Technology verified in practice

On the Restomotive blog, we are also developing technical topics related to the Mustang S550. The “Architecture of Precision” series discusses consecutive elements of the GTM suspension, including front and rear control arms, the vertical link and the toe link. In these publications, we show that the GTM project is built around specific technical challenges: geometry stability, wheel hop, rear axle behaviour and the predictability of the car under load.

That is exactly why Race Cup and the GTM are so important to us. The track reveals the problem, the blog allows us to explain it, and Restomotive parts are the engineering response to the specific limitations of the factory platform.

More than a logo at an event

Restomotive is not present in Race Cup merely as a logo on a sponsorship graphic. Our role includes patronage, co-organization, funding prizes, developing the GTM and building technology that is verified in practice.

For us, Race Cup is a meeting point with drivers, a source of data, a space for discussing real problems of track cars and a platform where we can show the development of RST Racing step by step.