GTP Cars: The Refueling Advantage & Energy Management Explained

The ability of IMSA’s Grand Touring Prototype (GTP) cars to effectively refuel energy during races is emerging as a critical component of competition, influencing not only on-track performance but also pit stop strategy. A key point, highlighted in recent discussions among racing enthusiasts, is that GTP vehicles can replenish energy, a feature that distinguishes them from traditional race cars.

This energy management capability stems from the hybrid powertrains employed in the GTP class. Teams are focused on maximizing efficiency, aiming to complete a given distance using the optimal blend of fuel and battery power. According to reports, GTP cars operate with three distinct race modes – Build, Balanced, and Attack – each designed to utilize battery power in a specific manner. The “Build” mode prioritizes energy recovery, while “Attack” mode focuses on deploying maximum power, and “Balanced” seeks a compromise between the two.

The “virtual energy” concept, as it’s been termed, directly impacts the duration of pit stops. While teams have reported that situations requiring maximum energy replenishment have been infrequent thus far, a defined procedure exists for addressing such scenarios. The series has protocols in place to handle instances where a car’s energy reserves are critically low, though details of those procedures remain largely undisclosed.

The technology underpinning this energy management system is complex. GTP cars are equipped with sophisticated systems that recover energy during braking and deceleration, storing it in a battery for later use. This recovered energy can then be deployed to supplement the internal combustion engine, providing a performance boost when needed. The goal, mirroring the approach taken in hybrid road cars, is to optimize energy usage for both performance and efficiency.

IMSA officials have also emphasized the importance of both on-track and in-garage battery charging strategies. The ability to effectively charge batteries during pit stops and while the cars are in the garage is crucial for maintaining a competitive edge throughout a race. The specifics of these charging methods, however, have not been publicly detailed.