Timeless Automobile are proud to present a Ford Sierra Sapphire RS Cosworth 2WD, built to the highest possible standard as a true sleeper: near-standard looks outside, a professionally engineered specification underneath, producing approximately 410 to 485 bhp.
The build was carried out by Bulldozer Srl (Alberto Tiso), a specialist Italian Cosworth engine builder, and purchased and comprehensively transformed on camera by renowned Italian car YouTuber and motoring journalist Davide Cironi. The full teardown, machining, engine build, dyno tuning and road testing were filmed and published, giving this car a complete, public record of exactly what was done and why.
Before the build began, the car was acquired from a single prior owner in remarkably original condition, with matching engine, interior and drivetrain, having been kept as a normal road car rather than a performance one. That original, unmolested starting point is part of what makes the resulting build so significant.
Additional Information
Provenance
● Genuine Sierra Sapphire RS Cosworth 2WD (4-door)
● Acquired from a single prior owner in original, unmodified condition
● Full build documented and published by Davide Cironi
● Built by Italian Cosworth specialist Bulldozer Srl (Alberto Tiso)
Engine
● Complete engine build on the stronger YB "200" (4x4-spec) block
● Reinforced block with long head studs for high-boost reliability
● New forged CPS pistons
● Rebuilt cylinder head with new valves and bronze valve guides
● Custom Colombo & Bariani camshafts
● New timing belt, full gasket and oil seal replacement
● Oil system inspected and refreshed
Turbo & Induction
● Garrett G25-660 turbocharger
● External wastegate and performance blow-off valve
● Larger intercooler and larger aluminium radiator
● Custom intake and intercooler pipework (TBF Performance)
● Upgraded silicone coolant hoses
Fuel & ECU
● Larger high-pressure fuel pump
● ECU remapped with dual boost/dual-map system
● Switchable road/high-boost modes
● Digital engine monitoring display replacing the factory clock, showing boost, RPM, injector duty, ignition timing and live engine data
Exhaust
● Supersprint performance exhaust system
● Custom fabricated pipework
● Original exhaust manifolds retained and modified
Suspension
● Custom-developed Öhlins adjustable suspension, engineered specifically for the Sierra Cosworth 2WD
● New suspension arms
● Complete Powerflex polyurethane bush kit
Brakes
● Larger, slotted brake discs
● Performance brake pads
● Braided stainless brake hoses
Wheels & Tyres
● 17-inch NTM wheels
● Michelin Pilot Sport 4 tyres
Power Output
● Built as a fast-road sleeper, not a race car
● Low boost: approx. 410 bhp
● High boost: approx. 485 bhp
● Tuned for strong mid-range torque and drivability rather than outright peak power
Cars like this rarely come to market. This is an originally preserved Sapphire RS Cosworth transformed into a documented, professionally built sleeper by a respected European Cosworth specialist. Available to view now.
