1.4 TSI 122-170 hp

Announced at the 2005 Frankfurt Auto Show to be used in the Golf GT, The 1.4l Twincharger is a TSI engine with a turbocharger and a supercharger in combination. Its downsizing leads to economy, with 14% more power than the 2.0 FSI but consuming 5% less fuel. The mechanical compressor operates at low engine speeds below 2400 rpm to increase low-end power, the turbocharger engages at middle revs, a clutch disengage the supercharger which will then be bypassed once the turbocharger reaches sufficient speed to provide boost above 3500 rpm.

In 2007 Volkswagen announced the 90 kW model which will replace the 1.6 FSI 115 hp (86 kW) engine. This engine differs from the 103 kW and 125 kW models in several ways. It is turbocharger only and has water-cooled intercooler to reduce charge time. The engine has reduced frictional losses, optimized camshafts, new intake port and new high-pressure injector valves. It is also 14 kg lighter than the 125 kW model, all to improve fuel economy and reduce emissions.

Configuration
1390 cm³ straight-4
Head
four-valve, 10:1 compression ratio
Block
grey cast iron, bore * stroke ratio 76.5 * 75.6 mm, 120 bar peak pressures
Fuel
FSI direct petrol injection up to 150 bar, high-pressure injection multiple-hole valve with six fuel outlet elements, injector on the intake side between the intake port and cylinder head seal level
Aspiration
90 kW model

turbocharger with maximum pressure 1.8 bar, water-cooled intercooler integrated into intake manifold

103 kW and 125 kW models

mechanical belt driven Roots compressor operated by a magnetic clutch integrated in a module inside the water pump, internal step-down ratio on the input end of the synchronization gear pair and exhaust turbocharger connected in series, administrated by a control flap, intercooler, 2.5 bar pressure at 1500 rpm.

Output
90 kW (122 PS), 200 Nm over 1500-3500 rpm in the Golf lineup later in 2007
92 kW (125 PS), 200 Nm over 1500-4000 rpm in the Audi A3
103 kW (140 PS), 220 N·m in the Touran from early 2006
125 kW (170 PS) at 6000 rpm, 240 N·m (MEP 21.7 bar) from 1750 to 4500 rpm , 200 N·m from 1250 to 6000 rpm, 7000 rpm max in the Golf GT
Applications
2005 VW Golf, 2006 VW Touran, 2008 VW Scirocco, possibly in the 2008 VW Concept R, 2007 SEAT LEON only 122PS
References
Volkswagen AG (2005-08-29). Volkswagen Golf GT TSI - Supercharged and Turbocharged 1.4l. Press release.
Volkswagen AG (2007-05-29). To the Point: TSI Offensive. Press release.
New VW 122 PS TSI Engine In Detail. Retrieved on 2007-06-23.