At HPT Turbochargers, we take pride in offering a wide range of sizes to suit various engine applications. To assist you in choosing the right size for your needs, we have created a categorized system. In this article, we will discuss the meaning of “F” in F-Series, how the turbos are classified, and the release dates for F1, F4, and F5. So, let’s start with the question – what does “F” stand for? As you can see in the picture above, the “F” refers to the Fujita Tornado Damage Scale, which was developed by T. Theodore Fujita of the University of Chicago in 1971. This scale rates the intensity of tornados based on wind speeds and potential damage. For more information, click here to learn about the international F-Scale. We were inspired by this classification and utilized it to categorize our turbocharger offerings. Our turbos are designed to deliver exceptional horsepower, high speeds, and outperform the competition. Here’s how we have grouped the F-Series Turbochargers: We are passionate about all kinds of high-performance motorsports, so we wanted to provide options for various applications. The different F-Series helps us classify the turbos into specific categories. Let’s break it down: F1 – perfect for smaller engines with high-power setups, such as side-by-sides, daily drivers, and motorcycles. F2 – ideal for those seeking 750 – 1000 horsepower. F3 – a smaller frame turbocharger for achieving over 1000 horsepower. F4 – for when a small frame turbocharger is not enough and you need to take your horsepower to the next level. F5 – for maximum effort combinations and winning races. You can check out our currently available F2 and F3 turbochargers for purchase. Now, you may be wondering when F1, F4, and F5 will be released. We believe in full transparency, and the truth is that we are still in the research and development stage for various turbocharger sizes. We are taking our time to ensure that we produce high-quality products and source components from reliable suppliers. We are not in the business of rushing to release new turbos. Our priority is to deliver the best products possible, and if that means it takes a bit longer, then so be it. However, we are in the final stages of developing F1, F4, and F5, and they should be available in Spring 2023. We are excited to amaze you with our new products!