GS300 2JZ-GE Turbo Kit: Ultimate Performance Upgrade Guide

Turbocharging the Lexus GS300’s 2JZ-GE engine transforms the vehicle from a sleek, dependable luxury sedan into a more exhilarating performance machine.

Our extensive knowledge and experience with turbo kits empowers us to assess the options available for the GS300 owner looking to make significant power gains.

Installing a turbo kit not only increases horsepower but also enhances torque, fundamentally altering the driving dynamics of your Lexus.

A sleek GS300 with a 2JZ-GE turbo kit, parked in a dimly lit garage, surrounded by tools and equipment

Selecting the right turbo kit requires an understanding of the components involved and the level of modification you’re willing to undertake.

We have observed the impressive potential of kits like those from CXRacing, which include quality components and the necessary hardware for boosting the naturally aspirated 2JZ-GE engine.

Reliability and performance go hand in hand, as the addition of a turbocharger demands durable parts and a well-tuned setup to ensure longevity and a seamless power delivery.

We aim to provide clarity on the various turbo kit solutions, weighing factors such as compatibility, ease of installation, and expected performance outcomes.

Whether targeting mild power improvements or aiming for high horsepower figures, there’s a turbo kit designed for your specific needs and mechanical skill level.

By prioritizing a combination of quality, efficiency, and support, we help ensure that your investment results in a rewarding upgrade to your GS300.

2JZ-GE Engine Overview

To truly understand the capabilities of a turbo kit for the GS300’s 2JZ-GE, we must begin with an overview of the engine itself.

Known for robustness, the 2JZ-GE engine is a favorite among enthusiasts for forced induction applications.

Historical Significance of the 2JZ

The 2JZ engines have an iconic status in the automotive world, in part due to their presence in the Toyota Supra.

With durability as a cornerstone, the 2JZ-GE (non-turbo variant) is a testament to Toyota’s engineering prowess and has been a popular choice for tuners for over three decades.


2JZ-GE (Naturally Aspirated):

  • Lacks factory turbochargers
  • Lower output of ~220 horsepower
  • Higher compression ratio: typically 10:1

2JZ-GTE (Turbocharged):

  • Equipped with factory turbochargers
  • Higher output of ~276+ horsepower
  • Lower compression ratio: typically 8.5:1

Our focus, the GE variant, is naturally aspirated, while the GTE is known for its turbochargers. When it comes to upgrading the 2JZ-GE with a turbo kit, understanding these differences is crucial for maximizing performance.

Understanding Compression in GE and GTE Motors

Compression ratio is a fundamental concept when discussing the 2JZ-GE and its turbocharged counterpart, the 2JZ-GTE.

The NA GE motor sports a higher compression ratio around 10:1, beneficial for throttle response and efficiency.

In contrast, the GTE’s ratio is reduced to approximately 8.5:1, which supports forced induction by allowing room for the added air charge without causing premature detonation.

The compression disparity is essential when adding a turbo to a 2JZ-GE—adjusting the engine’s compression ratio can be key to handling the boost without sacrificing reliability.

For those modifying the 2JZ-GE engine, a reduction in compression is often required to safely incorporate turbocharging technologies.

This involves changing internal components such as pistons and rods, a worthwhile endeavor for the power gains turbocharging brings.

Turbocharging the 2JZ-GE

The Toyota 2JZ-GE engine is a powerhouse ready for an upgrade. When turbocharged, the SC300 and Lexus GS300 can achieve significant power gains, transforming them into high-performance vehicles.

This process involves several crucial components that need to work harmoniously to deliver the desired performance outcomes.

Selecting a Turbo Kit for the SC300 and Lexus GS300

When choosing a turbo kit for the SC300 or Lexus GS300, consider these vital factors:

  • Turbocharger Type: A GT35 turbo is widely favored for its balance of power and responsiveness.
  • Intake and Fueling: Ensure the kit contains a larger injector and high-flow fuel pump to meet the increased fuel demands.
  • Intercooler: Opt for a front mount intercooler (FMIC) with appropriate piping and T-bolt clamps.
  • ECU and Tuning: A programmable ECU and professional tune are critical to handle the boost safely, especially on 93 octane fuel.
Component Consideration
Turbocharger GT35 with Garrett internals, oil cooled
Fuel System Upgraded injector, high-flow fuel pump
Intercooler FMIC with high-quality piping
ECU & Tune Programmable ECU, tailored tune for 93 octane

The Role of the Manifold and Wastegate in Boost Control

A properly designed manifold ensures effective exhaust gas flow to the turbo. Look for manifolds with equal length runners for optimal performance.

The wastegate, essential for boost control, should be chosen based on the engine and turbo specs.

A 50mm external wastegate with a v-band connection is a common and reliable choice to maintain the desired boost levels.

Intercoolers: Ensuring Thermal Efficiency

Intercoolers play a crucial role in cooling the compressed air from the turbocharger.

A thermally efficient intercooler will reduce the temperature, thus increasing the air density and allowing for more effective combustion.

A FMIC setup is typically recommended for these applications because of its superior cooling capabilities.

Exhaust Considerations: Downpipes and Dump Tubes

A 3-inch v-band downpipe is essential for exhaust gas expulsion and to prevent backpressure that could reduce turbo efficiency.

If an external wastegate is used, a dump tube should be installed to direct the wastegate exhaust gases away, reducing turbulence and improving the overall performance of the turbo system.

Performance Tuning and Upgrade Paths

Our focus here is clear. We’re aiming to maximize the performance of a 2JZ-GE engine fitted with a turbocharger, specifically for the Lexus IS300.

Starting off, we will address the critical nature of fuel and injector upgrades, followed by the intricacies of electronic management systems, and finally, the importance of reliable gauges in monitoring performance.

Fuel and Injector Upgrades for Optimal Delivery

To support the increased air intake from the GT35 T4 .68AR turbocharger, upgrading the fuel system becomes essential.

With a target of 550hp, installing injectors capable of high flow rates will ensure the engine gets the necessary fuel.

These injectors should be paired with a robust fuel pressure regulator to maintain optimal delivery across all performance levels.

ECUs and Electronics: Achieving the Perfect Tune

Fine-tuning is critical, and that’s where engine management comes in.

Utilizing systems like the SAFC (Super Air Flow Converter) enables us to manipulate fuel maps for optimal efficiency.

When pushing beyond 7-15psi, expert calibration by an ASE certified mechanic is advised.

This calibration can be achieved using a programmable ECU to manage variables precisely.

Gauging Performance: Managing Boost and Oil Pressure

Accurate gauging is indispensable to monitor our vehicle’s vitals.

Here, we’re talking about installing a high-quality turbo boost controller and a reliable oil pressure gauge.

These tools help us keep tabs on our Lexus IS300’s performance metrics in real-time.

They allow for adjustments on the fly to prevent damage to the engine.

Pairing an oil catch tank with the 10AN oil drain/return line kit ensures the engine runs clean, reducing the risk of blow-by contaminants.
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