Why Choose the EFR 9274?
The EFR 9274 is the largest frame in the EFR lineup, delivering massive flow headroom while retaining the transient response associated with much smaller turbos. If your build targets four-digit horsepower without sacrificing low-end drivability, the 9274 is the natural choice.
Key Features
Power range: 600 – 1 000+ HP (single setup)
Airflow capacity: up to 106 lb/min ≈ 1 630 kg/h
Bearing system: dual ceramic ball bearing
Turbine wheel: 74 mm Gamma-Ti – ultra-low inertia for fast spool
Compressor wheel: 72/91 mm FMW with Extended-Tip technology
Integrated components:
Compressor Recirculation Valve (CRV)
Boost Control Solenoid Valve (BCSV)
Speed-sensor port for shaft-speed monitoring
Available Turbine Housings
| Flange | Scroll | A/R | Wastegate |
|---|
| T3 | Single | 0.83 | internal |
| T4 | Twin | 0.92 | internal |
| T4 | Twin | 1.05 | external |
| T4 | Twin | 1.45 | external |
Technical Specifications
| Parameter | Value |
|---|
| Compressor inducer | 72 mm |
| Compressor exducer | 91 mm |
| Turbine wheel diameter | 74 mm |
| Max shaft speed | 125 000 rpm |
| Recommended oil feed | built-in 2 mm restrictor |
| Cooling | water + oil |
| Downpipe connection | 3″ V-Band |
Typical Applications
2.5 – 4.0 L high-performance gasoline engines
Drift, time-attack, drag builds needing quick spool with high pressure ratio
Single-turbo projects up to ~1 000 HP or twin-turbo setups to 2 000 HP+
User Benefits
Lightning-fast boost response thanks to lightweight Gamma-Ti turbine
High durability – ceramic bearings and stainless housings
Simplified plumbing – built-in CRV & BCSV reduce external components
Tuning safety – optional speed sensor helps prevent overspeed
Flexible setup – four A/R options, single- or twin-scroll designs
Installation Requirements
Exhaust manifold with T3 or T4 Twin-Scroll flange to match chosen housing.
Full water circuit (inlet at top, outlet at bottom) for thermal stability.
Oil feed with 2 mm restrictor; gravity oil return ‑10 AN min.
3″ V-Band downpipe.
ECU able to read turbo speed signal and implement overspeed limit.
