EcoBoost · 1.6 turbo I4. What the stock hardware is estimated to support, where it breaks first, and the honest path to more.
The Ford Fiesta ST (Mk7, 2013–2017) is rated 180 hp (EU 182 PS sustained, 200 PS on transient overboost (secondary road-test spec panel); US rating 197 hp · EU market) at 5,700 rpm and weighs 2,564 lb (kerb 1,163 kg (secondary spec panel)), or 14.2 lb/hp. On enthusiast estimates its stock internals are taken to about ~320 hp, the fuel system to around ~270 hp, and the stock turbo(s) are taken to about ~260 hp. Below: the sourced spec sheet, the limit sheet carbuildcheck analyzes against, and the platform's community-documented weak points.
Units
01 Spec sheet sourced
EngineEcoBoost · 1,596 cc · I4
Bore × strokenot sourced in this audit
Compressionnot sourced in this audit
Inductionsingle turbo
Fuel systemdirect
Rated power180 hp · EU 182 PS sustained, 200 PS on transient overboost (secondary road-test spec panel); US rating 197 hp · EU market @ 5,700 rpm
Torque177 lb-ft @ 1,500–5,000 (290 N·m on overboost) rpm
rotating assembly ceiling · fails first: rods and pistons under big boost · 98 RON · no named source: site planning estimate · site planning figure ~320 hp; no named Fiesta ST tuner source was fetched
Induction ceiling~260 hp
stock turbo / supercharger ceiling · fails first: stock turbo out of efficiency · 98 RON · no named source: site planning estimate · site planning figure ~260 hp
Fuel system~270 hp
stock fuel-system ceiling · fails first: HPFP · 98 RON · no named source: site planning estimate · site planning figure; no named source in this audit
Clutch (manual)~240 hp
stock clutch torque capacity · fails first: stock clutch slip · no named source: site planning estimate · site planning figure; no named source in this audit
Cooling (sustained)~300 hp
thermal ceiling for sustained load · fails first: intercooler and coolant temperature at pace · no named source: site planning estimate · site planning figure; no named source in this audit
Tuning limitsenthusiast estimates, crank hp on the stated fuel; sources: none named yet; method: the analyzer plans on the lower bound of each range
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