Subaru Impreza Cosworth Tuning @ POWERSTATION

POWERSTATION are pleased to offer the amazing Cosworth EJ25 2.5ltr Subaru high performance engine. This engine has been proven to be capable of
producing over 800bhp by Cosworth themselves.

Subaru EJ25 (STI)
High Performance Short Block Assembly (SB8005)

Cosworth EJ25 (STI) short block has gone through countless hours of dyno evaluation to determine the best combination of parts to guarantee maximum reliable performance. Each EJ25 short block starts with a brand new Subaru case. The case is inspected and then the bores are honed to perfection to receive Cosworth Forged Pistons. The rotating assembly is then balanced, this includes a new STI Forged crank and Cosworth Forged H-Beam Connecting Rods to within .5 gram. The select parts are professionally assembled by one of Cosworth’s skilled engine builders using their own coated, tri metal race spec bearings. Options include: Billet 79mm crankshaft, Billet timing belt guide. For added performance, please see our Cosworth CNC ported Big Valve Cylinder Heads and high performance camshafts.

  • New Subaru EJ25 STI Engine Case
  • New Subaru STI Forged Crankshaft
  • Cosworth Forged Connecting Rods
  • Cosworth Forged Pistons
  • Cosworth High Performance Piston Rings
  • Cosworth Race Spec coated Tri- Metal Bearings
  • Balanced and Professionally assembled
  • Billet Crankshaft optional (£2282.00 + VAT extra)

Cosworth Subaru EJ25 (STI) High Performance Short Block Assembly (SB8005) - £3,361.00 + VAT

Subaru EJ25 (STI)
CNC Ported Big Valve Cylinder heads Pr. (KK3670)

Cosworth CNC ported cylinder heads feature dyno tested and flow bench proven ports, engineered for maximum real world power. Each new cylinder head is ported on a 5 axis machine to ensure consistency and perfect port shape every time. Additionally, larger intake (+1mm) and exhaust valves (+1mm) are utilized to help increase flow. Cosworth CNC ported Big Valve cylinder heads come complete with a performance valve job, hi rev (max 10,500rpm) valve springs with titanium retainers and are ready to install. Perfect for big turbo applications. Subaru heads are priced for the pair. A flow chart for the head is available by downloading the following pdf - Cosworth Cylinder Head Flow Chart (28kb)

  • CNC Ported/machine finished ports - New OE Castings
  • Hand blended finish work
  • Intake 22% Increased Flow (max)
  • Exhaust 41% Increased Flow (max)
  • 4-angle Inlet Valve job
  • 3-angle & radiused Exhaust Valve job
  • Valves are lapped
  • Back-Cut Inlet Valves
  • Heads are Ultra Sonic cleaned prior to assembly
  • Heads are Serialized and sport a machined Cosworth logo
  • +1mm Stainless Steel Intake Valves (1800 degrees max.)
  • +1mm Inconel Exhaust Valves (2400 degrees max.)
  • Performance Valve Springs
  • Titanium Retainers
  • Hardened Steel Spring Platforms
  • Knife Edge port divider
Cosworth Subaru EJ25 (STI) CNC Ported Big Valve Cylinder Heads Pr. (KK3670) - £2520.07 + VAT



POWERSTATION fully built and shimmed Cosworth engine

with new Cosworth oil pump, head studs, head gaskets & performance cams.
Supply Only - £7899.00 + VAT

POWERSTATION complete Cosworth engine transplant

as above, also using our own spec GT series Turbo.
Supply & Fitted - £11495.00 + VAT

For the optional Cosworth Steel Billet Crank please add £2282.00 + VAT

POWERSTATION are able to offer alternative spec. Cosworth engines for your Subaru Impreaza, please call us on 01684 296675 to discuss the options.


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POWERSTATION
Northway Trading Est,
Northway Lane,
Tewkesbury,
Glos.
GL20 8JH

tel: 01684 296675
fax: 01684 296645

contact us by email

Workshop Opening Hours Mon - Fri
8.30am - 6.00pm

Saturday
9.00am - 12.30pm

Sunday - closed