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Toyota 3GR-FSE specs: 3.0L (182.9 ci) 6-cylinder, 87.5 x 82 mm (3.4449 x 3.2283 in) bore and stroke, 11.5:1 compression. Rated 252 hp. DOHC.
The Toyota 3GR-FSE is oversquare — the 3.4449" bore exceeds the 3.2283" stroke by 6.7% — a layout that favors airflow and RPM over leverage at the crank. The 3.2283" stroke does not reach 4,000 ft/min of mean piston speed until about 7,450 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 30.5 ci (500 cc).
11.5:1 on aluminum heads is high for a production gasoline engine; running a ratio like that on pump fuel depends on chamber design and fuel delivery rather than the number alone.
It is one of 11 engines in the GR V6 family, sitting between the 152.5 ci and 241.4 ci members. Factory fitments include the Toyota Crown, Lexus GS 300 (non-US), Lexus IS 300 (non-US).
| Displacement | 182.9 ci / 3 L |
|---|---|
| Bore | 3.4449" |
| Stroke | 3.2283" |
| Cylinders | 6 |
| Compression ratio | 11.5:1 |
| Bore/stroke ratio | 1.067 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 252 hp |
| Bore/stroke character | 1.067 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,228 ft/min — conservative for a street engine |
| Displacement per cylinder | 30.5 ci |
| Static compression | 11.5:1 — high enough that pump premium or better is normally required |
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