Why Upgrade the Turbocharger on Your 2.7T Engine

The 2.7T engine platform has long been a favorite among automotive enthusiasts who crave a balance of daily drivability and serious performance potential. While the factory turbocharger delivers respectable boost for stock applications, it quickly becomes the bottleneck when you chase higher horsepower targets. Upgrading to a larger turbocharger, such as the GTX3584RS, unlocks the engine's true breathing capacity and transforms the driving experience. Whether you are building a street-driven weekend warrior or a dedicated track car, the jump to a 2.7T turbo of this caliber delivers measurable gains in power, throttle response, and overall efficiency.

This article breaks down everything you need to know about the GTX3584RS upgrade: the power gains you can realistically expect, the supporting modifications that make the setup reliable, and the installation steps that separate a clean build from a headache. If you are considering this upgrade, read through the full guide before you turn a single wrench.

Understanding the GTX3584RS Turbocharger

The GTX3584RS is part of Garrett Motion's GTX Gen II family, widely regarded as a benchmark for high-performance ball-bearing turbochargers. It is engineered for applications that demand both high flow capacity and quick spool characteristics. The turbo features a 58mm inducer wheel paired with an 84mm turbine wheel, a combination that supports airflow ratings well beyond what a stock 2.7T turbo can deliver.

Key Design Differences Compared to Stock

  • Ball-Bearing Center Section: The GTX3584RS uses a dual-ball-bearing cartridge instead of the journal bearings found in most factory turbos. This design reduces friction, improves oil flow requirements, and dramatically shortens spool time.
  • Extended-Tip Compressor Wheel: Garrett's proprietary extended-tip technology improves aerodynamic efficiency and allows the compressor wheel to move more air at the same rotational speed. This translates to higher boost pressure with less heat generation.
  • Nickel-Chrome Turbine Housing: The turbine housing is cast from high-nickel-content material that withstands higher exhaust gas temperatures without warping or cracking. This is critical when running aggressive tunes or higher boost levels.
  • Integrated Compressor Cover: The compressor cover is designed for smooth inlet flow and includes a port for a blow-off valve or recirculation system, simplifying installation in engine bays with limited space.

Flow Capacity and Compressor Map

The GTX3584RS compressor map shows a peak efficiency island in the 55–65 lb/min airflow range, depending on the specific trim and housing combination. For a 2.7T engine, this translates to a practical power ceiling of approximately 600–700 wheel horsepower when paired with proper fueling and tuning. The turbo maintains strong efficiency well beyond 30 psi of boost, making it suitable for pump gas, E85, or race fuel applications.

Real-World Power Gains with the GTX3584RS on a 2.7T

The power increase you see from upgrading to a GTX3584RS depends heavily on the supporting modifications, fuel choice, and tuning strategy. However, consistent patterns emerge from thousands of builds in the enthusiast community.

Power Gains Over Stock Turbo

  • Whp Gains of 100–200: On a well-prepped 2.7T with basic bolt-ons (intercooler, exhaust, intake), the GTX3584RS typically delivers 100–200 more wheel horsepower than the stock turbo at the same boost level. When boost is turned up, the spread widens further.
  • Torque Curve Shape: The larger turbine wheel shifts the torque peak slightly higher in the RPM range, but the ball-bearing design keeps spool within 300–400 RPM of the stock turbo. The result is a broader, flatter torque curve that pulls hard all the way to redline.
  • E85 Gains: Switching to E85 or other high-octane ethanol blends can add another 50–80 whp on top of the gains seen on pump gas. The GTX3584RS has the headroom to exploit the knock resistance of ethanol fuels.

Typical Horsepower Targets by Build Level

  • Stage 1 (bolt-ons + tune): 450–520 whp on pump gas, 520–580 whp on E85.
  • Stage 2 (fuel system upgrade + larger intercooler): 550–620 whp on pump gas, 620–700 whp on E85.
  • Stage 3 (built engine + port injection): 650–750+ whp, limited only by turbo flow ceiling.

Essential Installation Tips for the GTX3584RS

Installing a turbocharger of this size on a 2.7T engine is not a weekend job for a novice, but with careful preparation, it is achievable for a motivated DIY builder. The following steps cover the critical path from unboxing to first start.

Preparation and Tooling

  • Gather all gaskets, O-rings, and sealing washers before you begin. Garrett supplies the turbo, but you will need manifold gaskets, oil return line gaskets, and coolant line seals separately.
  • Have a set of high-quality hex keys, torque wrenches, and stubby ratchets on hand. The 2.7T engine bay is tight, and reaching the lower turbo mounting bolts often requires short tools.
  • Pre-fit the turbo to the manifold and downpipe before final assembly. This allows you to identify clearance issues and make adjustments without the pressure of a running engine.

Oil and Coolant Line Routing

The GTX3584RS requires a dedicated oil feed line with a restrictor to limit oil pressure to 40–60 psi at the inlet. Running full engine oil pressure through the ball-bearing cartridge can cause seal failure. Use a -4 AN oil feed line with a 0.035-inch restrictor. The oil return line must be gravity-fed and at least -10 AN to prevent drain backup. Coolant lines can follow the factory routing, but upgrading to braided stainless lines improves durability.

Boost Control and Wastegate Setup

Larger turbos produce more exhaust backpressure, which can overwhelm a stock wastegate actuator. Use a dual-port or high-pressure actuator rated for 15–20 psi of spring pressure. If you plan to run boost above 25 psi, consider an external wastegate setup with a 38mm or 44mm gate mounted on the manifold or downpipe. This gives you precise boost control and reduces the risk of boost creep.

Intake and Inlet Plumbing

The GTX3584RS has a 4-inch compressor inlet, while the stock 2.7T airbox and MAF housing are typically 3 inch. You will need a silicone reducer coupler and a larger MAF housing or a speed-density tuning solution. Many builders switch to a blow-through MAF setup or eliminate the MAF entirely with a standalone ECU for the cleanest intake path.

Exhaust and Downpipe Fitment

The turbine outlet on the GTX3584RS is a standard T3 or T4 flange, but the downpipe must be custom-fabricated to clear the engine block, steering shaft, and chassis rail. Plan on a 3-inch downpipe with a flexible section to absorb thermal expansion. If your car is a manual transmission, verify clutch fork clearance before welding the downpipe.

Supporting Modifications That Make the Upgrade Work

Throwing a bigger turbo onto a stock engine is a recipe for disappointment. The following modifications are not optional if you want reliable power and safe operation.

Fuel System Upgrades

  • Larger fuel injectors (minimum 850cc for pump gas, 1200cc+ for E85).
  • High-flow fuel pump or in-tank pump rewire to maintain fuel pressure at higher flow rates.
  • Fuel pressure regulator and return-style fuel system if your 2.7T uses a returnless setup.

Intercooler and Charge Air Cooling

The GTX3584RS flows enough air to overwhelm a stock side-mount intercooler. Upgrade to a bar-and-plate front-mount intercooler with a core size of at least 600 cubic inches. Keep the charge piping diameter at 2.5–3 inches and use bead-rolled couplers to prevent blow-offs under boost.

Engine Management and Tuning

A custom tune is non-negotiable. The stock ECU calibration cannot compensate for the vastly different airflow characteristics of the GTX3584RS. Use a standalone ECU (such as a Haltech, Link, or AEM Infinity) or a reflashable stock ECU with a professional calibration. The tune must address not only fuel and ignition timing but also boost control target, knock thresholds, and cold-start enrichment.

Common Challenges During Installation and How to Solve Them

Space Constraints and Clearance Issues

The 2.7T engine bay was not designed for a turbo this large. The compressor housing often contacts the engine mount, the coolant reservoir, or the brake booster heat shield. Solutions include aftermarket engine mounts with adjustable positioning, relocation of the coolant tank, and custom heat shielding made from DEI reflective material.

Boost Leak Management

With the higher boost pressures the GTX3584RS can generate, even small leaks in the intake system become massive performance killers. After installation, perform a boost leak test by pressurizing the entire intake tract to 30 psi with a shop air adapter. Listen for hissing at couplers, the throttle body shaft, and the intercooler end tanks. Repair leaks with proper T-bolt clamps.

Heat Management and Cooling System Upgrades

  • Install a high-flow water pump or electric water pump controller to increase coolant circulation at low RPM.
  • Use a larger aluminum radiator with dual electric fans to shed the additional heat load.
  • Wrap the turbo downpipe and exhaust manifold with titanium heat wrap to reduce under-hood temperatures.

Maintenance and Longevity of the GTX3584RS

With proper care, a GTX3584RS can last 100,000+ miles on a street-driven 2.7T build. The key is oil quality and cooldown discipline. Use a high-quality synthetic oil with a viscosity of 5W-40 or 10W-40, and change it every 3,000–5,000 miles. After a hard pull, let the engine idle for 60–90 seconds before shutting it off to allow the ball-bearing cartridge to cool evenly and prevent oil coking.

Inspect the compressor wheel for debris damage every oil change by looking through the inlet. Replace the air filter at least once per year, and consider a pre-filter if you drive on dusty roads.

Cost Breakdown and Return on Investment

A fully built GTX3584RS turbocharger typically costs between $1,500 and $2,200 depending on the housing configuration and vendor. When you add supporting modifications (fuel system, intercooler, piping, tune, labor), the total investment for a reliable 600 whp build ranges from $5,000 to $8,000. Compared to other power-adders, this is one of the most cost-effective ways to double the factory horsepower output of a 2.7T engine.

Final Thoughts on the GTX3584RS Upgrade

Upgrading to a 2.7T turbocharger like the GTX3584RS is one of the most rewarding modifications you can make to your vehicle. The power gains are immediate and meaningful, the spool characteristics remain street-friendly, and the platform supports further upgrades down the road. By investing in proper installation, supporting modifications, and a professional tune, you build a car that delivers thrilling performance without sacrificing reliability. If you are ready to push your 2.7T beyond its factory limits, the GTX3584RS is a proven path to serious horsepower.

Additional Resources