See other engines in this family
Toyota B58B30 specs: 3.0L (182.9 ci) 6-cylinder, 82 x 94.6 mm (3.2283 x 3.7244 in) bore and stroke. Rated 335-382 hp, 2020–2026. Used in the Toyota Supra.
The Toyota B58B30 is undersquare — the 3.7244" stroke exceeds the 3.2283" bore by 13.3% — a layout that trades peak RPM for leverage and torque low in the range. The 3.7244" stroke puts mean piston speed at 4,000 ft/min around 6,450 RPM, which is where a production bottom end is generally considered at its limit. Each of the 6 cylinders displaces 30.5 ci (500 cc).
It is one of 4 engines in the BMW B48/B58 (Supra) family, the largest at 182.9 ci. 7 factory variants share these dimensions, rated from 335 to 382 hp across 2020–2026.
| Displacement | 182.9 ci / 3 L |
|---|---|
| Bore | 3.2283" |
| Stroke | 3.7244" |
| Cylinders | 6 |
| Configuration | I6 |
| Compression ratio | 10.2–11:1 (published figures vary) |
| Bore/stroke ratio | 0.867 |
| Fuel type | gas |
|---|---|
| Advertised HP | 335–382 hp |
| Years | 2020–2026 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2020 | B58B30 net | 335 @ 5000 | 365 lb-ft @ 1600 | 11:1 |
| 2021 | B58B30 net | 382 @ 5800 | 368 lb-ft @ 1800 | 10.2:1 |
| 2022 | B58B30 net | 382 @ 5800 | 368 lb-ft @ 1800 | 10.2:1 |
| 2023 | B58B30 net | 382 @ 5800 | 368 lb-ft @ 1800 | 10.2:1 |
| 2024 | B58B30 net | 382 @ 5800 | 368 lb-ft @ 1800 | 10.2:1 |
| 2025 | B58B30 net | 382 @ 5800 | 368 lb-ft @ 1800 | 10.2:1 |
Factory specification sheet.
| Bore/stroke character | 0.867 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,724 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 30.5 ci |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 2020 | 335 hp | B58B30 |
| 2021 | 382 hp | B58B30 |
| 2022 | 382 hp | B58B30 |
| 2023 | 382 hp | B58B30 |
| 2024 | 382 hp | B58B30 |
| 2025 | 382 hp | B58B30 |
| 2026 | 382 hp | B58B30 |
1 factory vehicle, 2020–2026. Each year opens that model's engine table.