Introduction: Unleashing the Full Potential of Your A90 Supra

The A90 Toyota Supra has rightfully earned its place as a modern icon, blending a striking design with the legendary B58 inline-six engine. While the stock turbocharger delivers an impressive 335–382 horsepower depending on the market, the aftermarket has unlocked enormous headroom for those seeking substantially more power. A turbocharger upgrade is the single most effective modification for dramatically increasing output, but choosing the right unit requires balancing your horsepower goals, driving style, budget, and the supporting modifications needed to make the setup reliable.

Below we have evaluated the five most popular turbocharger upgrades for the A90 Supra. Each offers a different combination of power potential, spool characteristics, and ease of installation. We have also included critical context on supporting modifications and tuning requirements so you can make an informed decision.

Factors to Consider Before Choosing a Turbo Upgrade

A turbocharger does not operate in isolation. To successfully run a larger turbo on the B58 engine you must plan for increased fuel flow, upgraded intake and exhaust systems, and professional engine management. Below are the key considerations to keep in mind before selecting a specific kit.

Your Power Goals and Driving Application

Are you building a daily-driven street car that needs quick spool and low-end torque? Or are you chasing quarter‑mile times where peak top‑end horsepower is the priority? Turbocharger selection directly influences how the power is delivered. A small-frame turbo will spool quickly and produce a broad torque curve, while a large-frame unit sacrifices instant response for massive top-end gains. Be honest about how you use your Supra.

Supporting Modifications Are Non‑Negotiable

Every turbo upgrade requires at least an upgraded fuel system (high‑pressure fuel pump, larger injectors, or port injection), a high‑flow intake and intercooler, a full exhaust system, and a custom tune from a reputable shop. Without these components, you risk knock, fuel starvation, and catastrophic engine failure. Plan your budget accordingly—the turbo itself is only part of the total cost.

Transmission and Drivetrain Limitations

The A90 Supra’s ZF 8HP automatic transmission is stout, but beyond 700–750 hp it begins to require upgraded clutches and valve body modifications. The factory differential and axles also become marginal at very high power levels. If you are aiming for 800+ hp, factor in these drivetrain upgrades as well.

Many aftermarket turbo kits eliminate catalytic converters or require downpipes that violate emissions regulations in certain states and countries. Check your local laws and consider whether you need to retain factory emissions equipment.

Top 5 Turbochargers for the A90 Supra

1. HKS GT II Turbo Kit – The Reliable Powerhouse

HKS has been a trusted name in Japanese performance for decades, and their GT II Turbo Kit for the A90 Supra is engineered for enthusiasts who want a substantial power bump without sacrificing daily‑driver civility. The kit includes a precision-machined turbine housing, a lightweight compressor wheel, and all necessary hardware for a straightforward installation.

  • Power Output: Up to 600 hp on pump fuel; 650+ hp with ethanol blends.
  • Spool Characteristics: Full boost arrives around 3,500–3,800 rpm, barely noticeable later than the factory unit. Torque delivery is linear and predictable.
  • Key Features: Compact design retains factory heat shielding; includes a billet wastegate actuator for stable boost control; compatible with factory oil and coolant lines.
  • Pros: Excellent reliability record; HKS provides detailed calibration maps for major tuning platforms (ECUTek, Syvecs); relatively easy DIY install for experienced mechanics.
  • Cons: Ceiling of around 650 hp means it may not satisfy those chasing 800+ hp goals.
  • Supporting Mods Needed: Downpipe, upgraded intercooler, larger low‑pressure fuel pump, and a custom tune.
  • Ideal For: Street-driven cars that see occasional track days or autocross. A great first upgrade for someone who wants a reliable 600 hp daily driver.

External link: Official HKS GT II product page.

2. Greddy TD06SH Turbocharger – Balance of Response and Top End

The Greddy TD06SH turbocharger has a long history of success on inline‑six engines, and the B58 is no exception. This unit features a redesigned TD06 turbine wheel paired with a modern compressor cover optimised for high flow without excessive shaft speed. Greddy’s design prioritises a smooth, progressive power curve that makes the car easy to control on the street or track.

  • Power Output: 650–700 hp depending on fuel and supporting mods.
  • Spool Characteristics: Full boost at 3,800–4,200 rpm; still responsive enough for spirited back‑road driving.
  • Key Features: Advanced compressor geometry reduces surge at lower boost levels; integrated bypass valve port for anti‑surge plumbing; high‑temperature turbine wheel ensures durability under sustained load.
  • Pros: Excellent mid‑range torque makes the car feel faster than peak numbers suggest; well‑proven on B58 engines with many tuners familiar with the setup.
  • Cons: Slightly laggier than the HKS GT II; larger physical size may require repositioning of the factory heat shield.
  • Supporting Mods Needed: Upgraded fuel system (HPFP and injectors), high‑flow intake and intercooler, full 3‑inch exhaust, and a professional tune.
  • Ideal For: Enthusiasts who want a strong mid‑range punch and are willing to trade a bit of low‑end response for 100 extra horsepower over the HKS option.

External link: Greddy TD06SH technical brochure.

3. Precision Turbo PT5858 – High–Horsepower Contender

Precision Turbo is a dominant name in the high‑hp community, and the PT5858 is one of the most popular frame sizes for late‑model BMW and Supra builds. This turbo uses a 58mm compressor wheel and a 58mm turbine, offering exceptional flow capacity while still spooling faster than larger 62mm+ units. The PT5858 is often chosen by racers aiming for 800 hp on a fully built engine.

  • Power Output: 700–800 hp (with E85 and built bottom end).
  • Spool Characteristics: Full boost at 4,200–4,600 rpm; requires higher revs to stay in the power band.
  • Key Features: Ceramic ball bearing center section for low friction; billet compressor wheel with extended tip technology; available with T4 or T3 turbine housing.
  • Pros: Extremely high efficiency allows big power without excessive backpressure; ball bearing design reduces lag relative to journal bearing units of similar size.
  • Cons: Requires a built engine and upgraded transmission for full power capability; installation is more involved—may require custom hot‑side piping.
  • Supporting Mods Needed: Forged pistons and rods, upgraded valvetrain, large port injection system, upgraded transmission components, and a high‑capacity oil cooler.
  • Ideal For: Hard‑core drag racers or track‑focused cars where maximum horsepower is the primary goal and low‑end response is less critical.

External link: Precision Turbo PT5858 specifications.

4. BorgWarner EFR 7670 – Cutting‑Edge Technology

BorgWarner’s EFR (Engineered For Racing) series incorporates decades of aerospace and motorsport expertise. The EFR 7670 uses a 67mm compressor wheel and a 70mm turbine, along with an integrated stainless steel wastegate that eliminates boost creep. The dual ceramic ball bearing system provides lightning‑fast spool relative to its size, and the titanium‑aluminide turbine wheel reduces rotational inertia.

  • Power Output: 700–750 hp (conservative on pump gas; 800+ hp on race fuel with built engine).
  • Spool Characteristics: Full boost by 4,000–4,300 rpm—impressive for a turbo of this capacity.
  • Key Features: Integrated boost control solenoid port; smooth cast compressor housing reduces inlet noise; reverse turbine scroll design improves flow distribution.
  • Pros: Lightweight and compact; excellent transient response because of the low‑inertia turbine; integrated wastegate simplifies tuning and reduces installation complexity.
  • Cons: Premium price point; not as many off‑the‑shelf bolt‑on kits for the A90 Supra as other options (often requires custom fabrication).
  • Supporting Mods Needed: Upgraded fuel system, high‑flow intake, 3‑inch downpipe, and a tune tailored for the EFR geometry. For 750+ hp, forged internals and transmission upgrades are recommended.
  • Ideal For: Enthusiasts who appreciate engineering excellence and want a turbo that combines high flow with surprisingly fast spool. Great for road courses and street cars that see occasional drag racing.

External link: BorgWarner EFR technology overview.

5. AEM Turbocharger Kit – Complete Bolt‑On Solution

AEM Electronics is renowned for their engine management systems, and their turbocharger kit for the A90 Supra aims to provide a complete, user‑friendly upgrade. The kit includes a high‑flow turbocharger, wastegate, blow‑off valve, and all necessary plumbing and gaskets. AEM also provides a base calibration map that makes initial startup and tuning easier for shops.

  • Power Output: 650–700 hp on E85; 600 hp on 93 octane.
  • Spool Characteristics: Full boost at 3,800–4,000 rpm—similar to the Greddy offering but with slightly more aggressive mid‑range.
  • Key Features: 58mm billet compressor wheel; T4 twin‑scroll turbine housing; includes AEM boost control solenoid and intake piping kit.
  • Pros: Everything needed in one box reduces the guesswork; AEM’s calibration support is excellent; kit is designed for a straightforward bolt‑on installation with no custom fabrication.
  • Cons: Power ceiling is limited to around 700 hp; the included wastegate may need upgrading for sustained high‑boost track use.
  • Supporting Mods Needed: Larger intercooler, upgraded fuel system (at least HPFP and injectors), downpipe, and a custom tune. AEM provides a solid starting point but final adjustment is still required.
  • Ideal For: Someone who wants a proven, all‑in‑one kit without having to source individual components. Good for a high‑horsepower street car that is professionally tuned.

Installation and Tuning Considerations

Regardless of which turbocharger you choose, proper installation and calibration are paramount. The B58 engine’s closed‑deck block is robust, but pushing it beyond 700 hp without careful tuning can lead to ring land failure or cracked exhaust manifolds. Work with a tuner who has specific experience with the A90 Supra and the ECU platform you plan to use (ECUTek, Syvecs, or Motec).

Key installation tips:

  • Replace all gaskets and crush washers during turbo swap to prevent oil and exhaust leaks.
  • Upgrade the turbo oil feed line to a braided stainless unit with a restrictor if recommended by the turbo manufacturer.
  • Verify that the wastegate port size matches the boost control strategy. A smaller port can cause boost creep, while an oversized port may bleed off power.
  • Use a high‑quality intercooler (at least 3.5 inches thick) to keep intake air temperatures low.
  • Invest in a catch can system to prevent oil vapour contamination of the intake tract.

Conclusion: Matching the Turbo to Your Vision

The A90 Supra’s B58 engine responds exceptionally well to turbocharger upgrades, and each of the five options above delivers a distinct driving experience. The HKS GT II remains the gold standard for those who want a straightforward, reliable 600 hp. The Greddy TD06SH and AEM kit offer excellent all‑round performance with room to grow. The Precision PT5858 is the choice for hard‑core power seekers who are willing to build the engine and transmission. Finally, the BorgWarner EFR 7670 stands out as a technological marvel for those who value fast spool and engineering quality above all else.

No matter which path you take, remember that a larger turbo is only one piece of the puzzle. A comprehensive approach—including fuel system upgrades, proper cooling, and professional tuning—will ensure your Supra remains thrilling, reliable, and safe at any power level. Take the time to research supporting components, consult with experienced builders, and do not cut corners on installation. The result will be a car that exceeds your expectations every time you press the throttle.