Upgrading your 1.8T engine with a turbo kit can significantly enhance performance. But with numerous options available, selecting the right 1.8T turbo kit can be challenging. This guide draws from extensive experience with various turbo setups on a 1.8T engine, including K03, K04-15, hybrid Frankenturbo, GTRS eliminator, 60-1 T3/T4, and Comp Triplex 5556, to help you make an informed decision.
GTRS Eliminator: A Balanced Approach to Power and Reliability
Among the many 1.8T turbo kits tested, the GTRS eliminator stands out as an excellent balance of power, drivability, and reliability. With supporting modifications and proper boost control, achieving 300 crank horsepower (CHP) on stock internals is readily attainable. The GTRS eliminator’s boost characteristics are particularly impressive. At 3500 feet elevation, full boost (21 PSI) is achieved around 3200 RPM. At lower elevations (below 1000 ft), expect full boost closer to 2700 RPM, with positive pressure building as early as 1800-2000 RPM. This translates to a broad 4000 RPM powerband and exceptional transient response above 3000 RPM for a 1.8T engine with a 7000 RPM redline.
Frankenturbo: Enhanced Response and Torque
Modern Frankenturbo 1.8t turbo kits, featuring mixed-flow turbines and improved compressor designs, also present a compelling option. These turbos offer superior boost response and increased low-end and peak torque compared to the GTRS eliminator. While delivering a similarly impressive power curve, the Frankenturbo’s enhanced low-end performance might be preferable for certain driving styles. Furthermore, a Frankenturbo can often be integrated with existing modifications, providing a noticeable power increase even before other supporting upgrades are implemented.
Considering APR Kits and Tuning Options
While APR 1.8t turbo kits were once popular, they now present certain drawbacks. The need for exhaust modifications to accommodate the Garrett turbo’s discharge flange adds complexity and cost. Additionally, the T25 flanged GT28RS in APR kits offers no performance advantage over an eliminator-style turbo. Both have identical turbine volute areas, and the larger T25 throat might even hinder spool time without increasing power output. Moreover, more advanced and customizable tuning options are now available, surpassing the older APR Stage 3+ tunes. These newer tuning solutions can be tailored to specific ambient conditions, fuel types, and modifications like water/meth injection, offering greater flexibility and performance potential.
Choosing the Right 1.8T Turbo Kit: Final Considerations
Ultimately, the best 1.8T turbo kit depends on individual needs and priorities. The GTRS eliminator provides a well-rounded combination of power, drivability, and reliability. The Frankenturbo excels in responsiveness and torque. Factors like budget, desired power levels, existing modifications, and tuning preferences should all be considered when making a decision. Remember to factor in the potential costs of exhaust modifications and explore the latest tuning options for optimal performance.
