Suzuki's acclaimed GSX-R series of engines are the basic building blocks of all RPE's racing engines, incorporating state-of-the-art technology with an unrivalled power-to-weight ratio.

The GSX-R 1300 Hayabusa is widely recognised as the world’s fastest production motorcycle, with a top speed of 194mph (312 km/h.) Distinctive features of the Hayabusa engine are its abundance of low-end torque and strength of the components, making it the ideal powerplant for four-wheel applications.

Note: All power figures below account for ram air effect and transmission losses recorded on RPE's rolling road.

engine dimensions
  • Length: 480mm
  • Width: 530mm
  • Height: 640mm
  • Dry Weight: 70kg (154lb)

This unit is the ideal lightweight, high-revving, small-capacity race motor, and includes:

  • Race ported and polished cylinder head
  • Reprofiled high-lift camshafts and adjustable sprockets
  • Titanium valves and retainers
  • Race valve springs
  • High-compression pistons
  • Oversized bore and long-stroke crank options
  • Crank lightening and balancing options
  • Billet anti-surge baffled wet sump kits
  • Up to 13,000 rpm rev limit


Redesigned in 2008 from 1299cc to 1340cc, with a lighter, titanium valve train, higher compression ratio, and a new cam profile, this engine features:

  • Stronger gearbox
  • Race ported and polished cylinder head
  • Full range of Cosworth pistons available for standard and oversize options
  • Long-stroke crank and oversize barrel options
  • Dry sump system with new design high-volume oil scavenge pump

RPE GSX-R Forced Induction

The GSX-R Hayabusa is the most popular donor bike engine for turbocharging. Radical Performance Engines have developed a three-stage system designed primarily to work in track applications. A Stage One system can be fitted without any engine work, and will produce 300bhp with around 6 psi of boost. Stage Two upgrades require engine modification which will produce 350bhp with 12psi of boost. Power can be increased to 380bhp with the addition of a chargecooler and further modification of the engine.

The graph below shows the Power/Torque of the RPE GSX-R 1300cc Turbo utilising ECU boost control selected using a multi-function map switch. The power was measured at the rear wheels of a Radical SR3.

  • Rotary-vane Garrett Al Research turbo
  • Blow-off valve
  • Injectors (including wiring adapters)
  • Billet fuel rail and fittings
  • Performance fuel regulator
  • Twin-stage boost controller
  • Intercooler upgrade
  • Gear relative boost control

Please click graph for a bigger version.
optional engine upgrades
Radical Performance Engines have designed, manufactured and developed a wide range of unique engine and gearbox components, which are available to customers to enhance the power and increase the reliability of their race engine. These include:

  • Cylinder head race porting and polishing, including oversize valve seats
  • Performance camshafts, in a range of reprofiled or billet cams
  • High-strength roller 'race' cam chains
  • Race valve gear including titanium retainers, race valve springs and one-piece stainless steel valves
  • Cosworth lightweight, high-performace two and three-ring pistons
  • Oversized cyliner barrels with Nikasil-plated bores
  • Arrow high-strength forged steel conrods
  • Arrow billet long-stroke crankshafts
  • Lightened, polished and knife-edged crankshafts
  • High-strength clutch components including billet clutch baskets/back plates, race springs and steel clutch centres
  • Uprated gearbox components, including heavy-duty steel shafts, stronger gear, close ratio six-speed and three-speed gearbox kits
  • Dry sump systems which eliminate oil surge and improve efficiency
  • Extra-high-volume oil scavenge pumps
  • High-strength billet clutch cylinder
  • Life racing ECU and wiring harness