Toyota Supra MK5 A90 GR B58TÜ turbocharger

Toyota Supra MK5 (A90/A91) utilizes the BMW-sourced B58TÜ (B58B30O1) engine, which features a sophisticated twin-scroll turbocharger system. Depending on the production year of the Supra, there are important distinctions in the turbocharger and manifold design.

1. Technical Specifications

The B58TÜ turbocharger is a single Twin-Scroll unit integrated directly into the exhaust manifold to improve thermal efficiency and reduce turbo lag.

• Manufacturer: Garrett (MGT22 series) or BorgWarner (depending on specific production batch/market).

• Design: Twin-scroll (two separate exhaust gas paths to the turbine) to minimize exhaust gas interference.

• Wastegate: Fully electronic actuator for precise boost control and faster catalyst heating.

• Cooling: Water-cooled bearing housing and integrated into the engine’s indirect intercooling circuit.

2. The 2-Port vs. 6-Port Distinction

This is the most critical factor when sourcing or upgrading a Supra B58TÜ turbocharger:

• 2-Port (2020 Model Year): The exhaust manifold integrated into the turbo has only two exhaust ports. These models are rated at 335 hp.

• 6-Port (2021+ Model Years): The redesigned manifold has six individual ports (one for each cylinder). This design allows for better flow and heat management, contributing to the factory power bump to 382 hp.

  • Note: The 6-port turbo is a popular retrofit for 2020 owners, but it requires the matching 6-port cylinder head.

3. Key Part Numbers & Components

4. Common Failure Points & Maintenance

While the B58TÜ is generally considered very robust, there are a few areas to monitor:

• Coolant Loss: The B58 is known for minor coolant consumption. Ensure the turbo cooling lines are tight and the expansion tank caps are sealing correctly.

• PCV System: A failing PCV (Positive Crankcase Ventilation) can send oil into the turbo inlet, leading to smoke or carbon buildup on the compressor wheel.

• Heat Management: For track use, the integrated manifold generates significant heat near the cylinder head. Upgraded heat shielding is a common preventative measure.

5. Performance Potential

The stock B58TÜ turbo is highly efficient but reaches its physical limit at approximately 450–480 wheel horsepower (whp) with ethanol blends.

• Hybrid Upgrades: Many enthusiasts swap the internal wheels (Pure700, Pargas, etc.) while keeping the stock housings to maintain the fast spool and factory electronic wastegate control.

• Big Turbo Kits: For builds exceeding 600whp, top-mount kits (Precision or Garrett G-Series) that bypass the integrated manifold are standard.