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Audi updates the 1.8TFSI engine

By SYF77 on 14 Aug 2011

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The brand with four rings has released details regarding its completely revised 1.8 TFSI engine, which will be fitted in the updated Audi A5 family. The turbocharged four-cylinder gasoline unit comes as the base engine for Europe, and is capable of delivering 170 horsepower and 320Nm of torque, while returning a fuel consumption figure of 5.7L/100km. This means consumption has been reduced by 21 percent compared with the previous model engine. The revised A5 emits just 134g of CO2 per km. Coupled with a manual transmission, the 1.8 TFSI accelerates the Audi A5 Coupe from zero to 100 km/h in 7.9 seconds on its way to a top speed of 230 km/h .

“Combustion behavior was a particular focus of the development work,” Audi explains. In addition to FSI direct injection, the 1.8 TFSI also uses indirect injection. This system injects the fuel at the end of the intake manifold near the tumble valves, where it is swirled intensively with the air. Indirect injection is used in the part-load range. It reduces fuel consumption and particulate emissions to such an extent that the four-cylinder engine already complies with the limits of the future Euro 6 standard, which does not enter into force until 2015.

The rail pressure of the FSI system has been increased from 150 to 200 bar. The direct injection system is active when starting off and at higher loads. It can perform two or three individual injection operations per work cycle. To further optimize gas exchange, the valve control system has been given greater operating freedom. The Audi valvelift system, which adjusts the lift of the valves in two stages, is active on the exhaust side. The two camshafts can be adjusted through 30 or 60 degrees of crankshaft angle.

It is timely that Audi updates the 1.8 TFSI lump. The original 160bhp powerplant is getting a bit long in the tooth. It's latest rival, the Mercedes C 250 Coupe, produces 204 bhp from its 1.8 litre turbocharged engine. It looks like Audi still have some catching up to do.

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Written by SYF77
I have been a car fanatic since 1989, when my father was changing our family car then to a Toyota Corolla 1.6 GL fitted with a Twin Cam 16 valve engine that was carburetor-fed, a big deal back in those days. The automobile technology and industry fascinates me and I hope to broadcast these interesting developments to everyone out there through this blog.

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Watwheels Aug 15 2011 08:49 AM
TC engines are about torque@rpm figures. No point flexing all the hp figures w/o looking at the overall car package.
Let's look at the torque figures:
Audi 1.8L TFSI: 320Nm @ 1400rpm ~3700rpm
Merc 1.8L TC: around 310Nm @ 2200rpm
BMW 2.0L TC: 270Nm @ 1250rpm (I know this is not apple to apple, but it's close)
In terms of acceleration and throttle response, you can see Audi & BMW is almost instant. For the Merc you got to push the 1.8L NA to 2200rpm before you feel the boost kicks in. IMO it's a far cry from the other 2 engines.
What can I say? I'm not a hp guy like most ppl. It's all in the twisting power call torque.
Paddie Aug 15 2011 09:50 AM
Why does Audi 'still have some catching up to do'? This engine looks really impressive overall and I doubt any of the other brands' 1.8s can match its fuel efficiency.
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