The IHI IS20 turbo is a common sight in the engine bay of the Mk7 GTI. But how does this turbocharger compare in size and performance to other popular options like the IS38 and Garrett Pmax? This article delves into a comparative analysis using averaged dyno chart data to understand the power and torque curves of each turbo.
IS20 vs. IS38: Power and Torque Delivery
To understand the performance differences, average dyno results were compiled for both Stage 2 IS20 and tuned IS38 turbochargers. While individual results can vary, the averaged data provides a general comparison of their power delivery characteristics. The data reveals distinctions in both horsepower and torque curves across the RPM range.
Introducing the Garrett Pmax: A Third Contender
The Garrett Pmax Stage 1 turbocharger offers another compelling alternative to the IS38. To compare its performance, dyno charts for the Pmax (specifically using pump gas tunes) were gathered and averaged. The RPM range was extended to 7,000 RPM for the Pmax analysis due to greater data availability at higher engine speeds. However, IS20 data was limited to a lower RPM range, and IS38 data at higher RPMs was sparse, potentially impacting the smoothness of the curves in those regions.
Analyzing the Results: Averages and Individual Variation
It’s crucial to remember that these charts represent averaged data. Individual dyno results will inevitably vary due to factors like tuning, fuel quality, and other modifications. The charts illustrate general trends in power and torque delivery for each turbo, providing a valuable benchmark for comparison.
Understanding the IS20 Turbo Size and its Implications
While the exact dimensions of the IS20 turbo aren’t explicitly stated, its smaller size compared to the IS38 and Garrett Pmax is reflected in the dyno charts. The lower peak horsepower and torque numbers suggest a smaller turbine and compressor wheel within the IS20, resulting in a different flow capacity and ultimately affecting its power output potential. This analysis underscores the importance of considering turbo size when modifying a vehicle for performance. The IS20, while sufficient for the stock GTI, might become a limiting factor for those seeking significant power gains. Upgrading to a larger turbo like the IS38 or Garrett Pmax offers the potential for substantial increases in horsepower and torque, but it’s essential to weigh these benefits against other factors like cost, installation complexity, and the potential need for supporting modifications.
Conclusion: Choosing the Right Turbo
Ultimately, the “best” turbo depends on individual performance goals and budget. The IS20 provides a solid foundation for the GTI, while the IS38 and Garrett Pmax offer significant performance upgrades for those seeking more power. Understanding the performance characteristics of each, as illustrated by these averaged dyno charts, helps inform the decision-making process when considering turbo upgrades.
