In this video, we put Scrat, our high-performance Cummins drag truck, back on the dyno to run a detailed turbine housing comparison. The truck is running a compound turbo setup with an S480 and a GT55, and we tested three different turbine housings to measure their effect on performance. The housings tested include a 115 divided, a 132 divided, and Power Driven Diesel’s new undivided turbine housing. We are focusing on how each one affects boost, drive pressure, interstage pressure, air-fuel ratio, and horsepower across the RPM range.
This is not just a dyno pull video. We dig into the data and break down exactly how each housing impacts engine behavior. We look at boost versus drive pressure relationships, analyze horsepower gains at high RPM, and compare interstage pressure levels. The results are clear. The undivided housing produced the highest peak horsepower at 1,529 and also showed the lowest drive pressure. This kind of change can make a major difference in how a turbo system performs, especially in high-power applications.
The engine in Scrat is also equipped with several new parts we are testing before they are released. It features a brand new OEM-style cylinder block that has been machined for 14 millimeter main studs, along with our new Power Driven Diesel 6.7-liter crankshaft. We are testing advanced honing techniques for better ring seal and have installed our new induction-hardened seat cylinder head. This dyno session is not just about turbine housings. It is part of a full validation process for new product development and long-term durability.
If you are building a compound turbo setup or looking to maximize power in a high-RPM diesel application, this video offers critical insight. Each housing has strengths and weaknesses. The smaller 115 divided housing helps with bottom-end response and spool-up, while the larger and undivided options improve top-end horsepower and reduce drive pressure. Understanding how these changes affect your setup can help you choose the best configuration for your goals.
Whether you are a diesel performance enthusiast, engine builder, or someone looking to make more informed decisions about your turbocharger setup, this is the kind of technical content that delivers real answers. Make sure to like the video, subscribe to the channel, and leave a comment with any questions or suggestions for future testing. We appreciate your support and look forward to bringing you more real-world diesel data and performance insights.
Power Driven Diesel is a specialty performance shop engaged in the engineering and development of high-performance turbo diesel technologies.
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