Gen 2 or Gen 3 B58

[Pxtra]

I recently bought a 2025 mk5 supra, was wondering if anyone could help identify if it’s a gen2 or gen3 b58. some parts of the car say 9/2024 so it could be a 2024 with a 2025 name over it, any help would be appreciated, also a manual if that means anything at all, thanks

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[itzTang]

I recently bought a 2025 mk5 supra, was wondering if anyone could help identify if it’s a gen2 or gen3 b58. some parts of the car say 9/2024 so it could be a 2024 with a 2025 name over it, any help would be appreciated, also a manual if that means anything at all, thanks

2

 

[razorlab]

All Supras are Gen 2, including 2020 2-ports.

BMW M340i/M440i get Gen 3 now, while the M240i still has the Gen 2.

 

[Pxtra]

All Supras are Gen 2, including 2020 2-ports.

BMW M340i/M440i get Gen 3 now, while the M240i still has the Gen 2.

gotcha and all supras after 2021 are 6-port?

 

[razorlab]

gotcha and all supras after 2021 are 6-port?

In North America, yes.

 

[Pxtra]

In North America, yes.

Sounds good! Thank you

 

[razorlab]

Sounds good! Thank you

I read your question again and just to be clear, 2021 and after are 6 ports in North America. 2020 is the only year in NA that had the 2 port.

Gen 3 B58 is back to 2 port everywhere but the Supra doesn't have that.

 

[ColonelAdama]

Sure would have been nice to get PI from the factory on our Gen 2s though...

 

[i3igpete]

But OTOH, I've seen the downpipes on the gen3 engines are ENORMOUS and you need to drop the subframe to get them out...

 

[itzTang]

But OTOH, I've seen the downpipes on the gen3 engines are ENORMOUS and you need to drop the subframe to get them out...

dang those are tortas

 

[J29DB03]

But OTOH, I've seen the downpipes on the gen3 engines are ENORMOUS and you need to drop the subframe to get them out...

 

[FLtrackdays]

Interestingly there are various AI ? takes on it. Which supports why an upgraded manifold is advantageous and now used in Gen 3 B58 engines. One of the better summaries I found was from Claude 4.0 Sonnet (below):

Difference Between Gen 2 and Gen 3 B58 Engines
“Key Technical Differences:
• Fueling:
• Gen 2 B58 uses only direct injection, but with an upgraded high-pressure fuel pump (HDP6 EVO) and improved injectors for better spray and higher flow, supporting higher power and ethanol blends.
• Gen 3 B58 (also referred to as B58TU2) adds factory port injection alongside direct injection, providing even more fueling headroom for high power and tuning, and improving reliability under heavy loads.
• Intake Manifold & Intercooler:
• Gen 2 has a plastic intake manifold/intercooler cover with a radial ribbed design.
• Gen 3 features an exposed metal intake manifold/intercooler, making it visually distinctive and likely improving heat dissipation.
• Electronics & Sensors:
• Gen 2 uses analog boost sensors.
• Gen 3 switches to digital (SENT protocol) boost sensors, which allows for more precise tuning and monitoring.
• Ignition System:
• Gen 3 has a redesigned coil pack, easily distinguishable from previous generations.
• Other Improvements:
• Gen 3 incorporates further refinements to support higher power, easier tuning, and better reliability, including built-in port injection and digital sensor integration.
Performance Implications:
Gen 3’s addition of port injection and digital sensors means it can support even more power with less risk of running lean or suffering from carbon buildup, and tuning is more flexible and robust.
Which Models Use the Gen 3 B58 (B58TU2)?
The Gen 3 B58 (B58TU2) is the latest version and is being rolled out in BMW’s newest models, typically starting with 2024 and newer model years. Some known applications include:
• BMW X3 M50 (G45, 2025+)
• BMW X5 40i (G05, 2024+)
• BMW X6 40i (G06, 2024+)
• BMW 540i (G60, 2024+)
• BMW 740i (G70, 2023+)
• BMW X7 40i (2023+)
• BMW M340i (expected in upcoming model years)
• BMW 840i (G14, 2024+)
The Gen 3 B58 is not yet in the Toyota GR Supra as of the latest information; the Supra uses the Gen 2 B58 (B58B30O1) through at least the 2025 model year.”

 

[FLtrackdays]

And it’s take on 2 port vs 6 port ?, both lengthy but interesting:

“The 6-port B58 engine offers significant performance advantages over the 2-port version, primarily in airflow efficiency and power output. The 6-port head provides approximately 30 more horsepower than the 2020 2-port models from the factory. More importantly, the 6-port design demonstrates substantial gains in high-performance applications, with dyno testing showing the 6-port head gained approximately 200 ft-lbs of torque at 4500 RPM and maintained those gains throughout the entire power curve compared to the 2-port version.
Key Performance Differences
The fundamental advantage lies in the cylinder head design and airflow characteristics. The 6-port configuration allows for better breathing and more efficient air distribution to each cylinder. This becomes particularly evident in modified applications where the improved airflow capacity of the 6-port head supports higher power levels more effectively.
Power Delivery Benefits:
• Enhanced torque production across the RPM range
• Better performance scaling with modifications
• No performance losses compared to 2-port design
• Plug-and-play compatibility (same cams, valves, springs, sensors, injectors, and fuel pump)
2-Port Design Purpose and Applications
The 2-port cylinder head serves specific purposes, particularly for emissions compliance and thermal management. The 2-port design integrates some manifold components directly into the head, allowing coolant to flow through these passages. This configuration helps the engine run more efficiently and produces fewer emissions, which is why European markets often receive 2-port versions to meet stricter EU emission standards.
Generation and Model Year Breakdown
Toyota Supra Applications:
• 2020 Supra: 2-port B58 (first generation)
• 2021+ Supra: 6-port B58 with increased power output
The 2020 model year used the 2-port configuration, while Toyota upgraded to the 6-port design starting in 2021, providing the higher 382 horsepower output. This created some disappointment among early adopters who felt they received the less powerful configuration.
BMW Applications:
 Different BMW models received various configurations at different times, with larger vehicles like the X5 and X7 often getting 2-port versions despite their size, contrary to traditional practices where bigger vehicles received more powerful engines.
The choice between 2-port and 6-port often comes down to the intended use case: 2-port for emissions compliance and efficiency, while 6-port excels in performance applications where maximum power output is desired.”

 

[ColonelAdama]

dyno testing showing the 6-port head gained approximately 200 ft-lbs of torque at 4500 RPM and maintained those gains throughout the entire power curve compared to the 2-port version.

I wish ?

 

[razorlab]

the 6-port design demonstrates substantial gains in high-performance applications, with dyno testing showing the 6-port head gained approximately 200 ft-lbs of torque at 4500 RPM and maintained those gains throughout the entire power curve compared to the 2-port version.

AI is drunk again.

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