the Mk5 Golf GT, the 125 kW 1.4-litre TSI engine is a "Twincharger", and uses both a turbocharger and a supercharger. Its displacement downsizing leads to improved fuel economy, with 14% more power than the 2.0 FSI, but consuming 5% less fuel. The mechanical supercharger compressor, driven at 5 times the speed of the crankshaft, mainly operates at low engine speeds from idle up to 2,400 revolutions per minute (rpm) to increase low-end torque. At engine speeds just above idle, the belt-driven supercharger provides a boost pressure of . The turbocharger assumes full effectiveness at middle revs, and the engine map disengages the clutch-controlled supercharger at a maximum upper limit of 3,500 rpm; the supercharger will then be bypassed once the turbocharger spools up and reaches sufficient speed to provide adequate boost in the upper rev-ranges. This engine is made at Volkswagen-Motorenfertigung, Chemnitz. In 2007, Volkswagen announced the 90 kW model which will replace the 1.6 FSI engine. This engine differs from the 103 kW and 125 kW models in several ways. It uses only one method of forced induction – a turbocharger (and not a supercharger), and has water-cooled intercooler. The engine has reduced frictional losses, optimised camshafts, new intake ports, and new high-pressure injector valves. It is also lighter than the 125 kW model, in order to improve fuel economy and reduce emissions. identification parts code prefix: 03C, ID codes: BLG, BMY, CAXC engine displacement & engine configuration inline-four engine (R4/I4); bore x stroke: , stroke ratio: 1.01:1 – 'square engine', 347.5 cc per cylinder, peak pressures, compression ratio: 10.0:1 cylinder block & crankcase grey cast iron; cylinder spacing, five main bearings, die-forged steel crankshaft, roller chain-driven oil pump cylinder head & valvetrain cast aluminium alloy; four valves per cylinder, 16 valves total, low-friction roller finger cam followers with automatic hydraulic valve clearance compensation, roller chain driven double overhead camshaft (DOHC), continuous adjusting variable intake valve timing aspiration hot-film air mass meter, cast alloy throttle body with electronically controlled Bosch "E-Gas" throttle valve 90 to 96 kW variants — two-part plastic intake manifold, turbocharger incorporated in exhaust manifold with maximum boost pressure , water-cooled intercooler integrated into intake manifold 103 to 125 kW variants — multi-ribbed belt-driven fifth-generation Eaton Roots-type positive displacement supercharger operated by a magnetic clutch integrated in a module inside the water pump, internal step-down ratio on the input end of the synchronisation gear pair,