What turbo is in a Focus ST?
The Focus ST is powered by Ford’s EcoBoost turbocharged engines, but the exact turbo varies by generation. In the early STs, a 2.0-liter EcoBoost uses a twin-scroll turbo, while the latest ST models run a larger 2.3-liter EcoBoost with a higher-flow turbocharger.
Turbo setups by generation
Focus ST Mk3 (2013–2018)
During the Mk3 era, the Focus ST used a 2.0-liter EcoBoost inline-4 paired with a turbocharger designed for quick spool and strong midrange performance. This setup helped the car deliver brisk acceleration and a lively driving character typical of the hot hatch segment.
Key specifications for the Mk3 Focus ST turbo setup:
- Engine: 2.0-liter EcoBoost inline-4
- Turbocharger: twin-scroll turbocharger
- Power: 252 hp
- Torque: 270 lb-ft (364 Nm)
In summary, the Mk3 Focus ST relies on a twin-scroll 2.0L EcoBoost turbo to deliver its performance, balancing punchy low- to mid-range torque with responsive throttle feel.
Focus ST Mk4 (2020–present)
The current generation shifted to a larger 2.3-liter EcoBoost engine, paired with a higher-flow turbo to support more power and improved top-end performance. This configuration is designed to deliver stronger acceleration while maintaining daily drivability and improved cooling and intercooling for repeated spirited driving.
Key specifications for the Mk4 Focus ST turbo setup:
- Engine: 2.3-liter EcoBoost inline-4
- Turbocharger: larger high-flow turbocharger (twin-scroll design)
- Power: ~276 hp (206 kW)
- Torque: ~420 Nm (310 lb-ft)
In summary, the Mk4 Focus ST uses a larger, high-flow turbocharger on the 2.3-liter EcoBoost to boost power and torque above the Mk3’s levels, while preserving drivability and response.
What this means for performance and buyers
Across its generations, the Focus ST has consistently used turbocharged EcoBoost engines, with the turbo configuration evolving to match the engine displacement and performance targets. Buyers looking at older Mk3 models should anticipate a more compact turbo setup and a strong midrange, while Mk4 examples bring a higher power ceiling thanks to the 2.3-liter base engine and a more capable turbo system.
Summary
In short, the Focus ST’s turbo setup evolved from a twin-scroll turbo on the 2.0-liter EcoBoost found in the Mk3, to a larger, high-flow turbo on the 2.3-liter EcoBoost used in the Mk4. Both generations emphasize turbocharged performance, with the latter delivering higher peak power and torque while maintaining the lively character the Focus ST fans expect.
How much boost does stock Focus ST have?
Stock with no tune runs a solid 15-18. Now I'm running 24-25 with a tune on stock internals. 23-26 I've seen.
Which is better Focus ST or RS turbo?
If you want a hot hatch to track, then the Focus RS is the clear winner here as it's got quicker acceleration and its AWD system is ideal for getting up to speed and cornering. However, if you want more of a fun hatchback to take out for a quick blast at the weekends, the ST is the one for you.
Is a Focus ST faster than a WRX?
I'm pretty sure is quicker. It's faster. But you just don't feel it as much and the all-wheel drive is obviously nice with the WRX with the ST. You're not going to get the all-wheel.
What size is a K03 turbo?
| K03-005 | K03-029 | K03-073 |
|---|---|---|
| Compressor Size: 36/50mmTurbine Size: 36/45mm | Compressor Size: 36/50mmTurbine Size: 40/45mm | Compressor Size: 38/51mmTurbine Size: 40/45mm |
| Engnes using this turbo:AEB,APU,ATW,ANB 150psAJL 180ps | Engnes using this turbo:AVJ, AWT 150psBFB 163psAMB,AWM 170ps AWP 180ps | Engines using this turbo:BEX,BVR 190ps |
