Error 404--Not Found

From RFC 2068 Hypertext Transfer Protocol -- HTTP/1.1:

10.4.5 404 Not Found

The server has not found anything matching the Request-URI. No indication is given of whether the condition is temporary or permanent.

If the server does not wish to make this information available to the client, the status code 403 (Forbidden) can be used instead. The 410 (Gone) status code SHOULD be used if the server knows, through some internally configurable mechanism, that an old resource is permanently unavailable and has no forwarding address.

Error 404--Not Found

Error 404--Not Found

From RFC 2068 Hypertext Transfer Protocol -- HTTP/1.1:

10.4.5 404 Not Found

The server has not found anything matching the Request-URI. No indication is given of whether the condition is temporary or permanent.

If the server does not wish to make this information available to the client, the status code 403 (Forbidden) can be used instead. The 410 (Gone) status code SHOULD be used if the server knows, through some internally configurable mechanism, that an old resource is permanently unavailable and has no forwarding address.

New Engine Review
Audi's Turbocharged Twins

It was with turbocharged engines that Audi scored its many rally and touring-car racing successes, honing this power-boosting technology for both spark-ignition and diesel powertrains. So Audi engineers chose to develop two versions of the corporate turbocharged 1.8-L engine with five valves per cylinder for their latest car—the TT Coupe. The basic engine design, which places emphasis on abundant torque, was deemed ideal for the task by the development team. Using it as a basis, many components were either modified or completely redesigned to suit the new task, from the turbocharger and the intake manifold to the engine-management control unit. Thus it was possible to increase power output for the two TT models from 112 kW (150 hp) to 132 kW (180 hp) and 165 kW (225 hp).

Output curves of the 132- and 165-kW TT engines show relatively flat torque production.

One of the more important contributors to the increase in output is the design of the inlet ports. They impart a tumble effect to the charge air as it enters the combustion chamber, thus increasing the speed of the combustion process and ensuring more complete combustion. The results are increased efficiency and lower emissions. In this case, the TT engines benefited from experience Audi engineers acquired in developing the new V6 "biturbo" engine for the S4.

The TT engines feature the latest electronic engine-management generation, Motronic ME 7.5. The functions controlled by this adaptive system are extensive and include throttle butterfly position; boost pressure control; sequential fuel injection with air mass measurement by means of a hot-film sensor; mapped ignition characteristic with a solid-state high-tension distribution system including individual coils for each cylinder; and cylinder-selective knock control with two sensors.

The system senses the amount of torque requested by the driver and decides how this wish can be fulfilled rapidly and economically. It then adjusts the throttle butterfly position, turbocharger boost pressure, and ignition timing to the most suitable settings. An electronic connection between accelerator pedal and engine enables the throttles to be opened and closed by the precise amount required. Engine parameters can be modified according to the grade of available fuel to maintain the most favorable relationship among boost pressure, torque, and ignition timing.

The higher-output 165-kW (225-hp) engine uses a high compression ratio (8.9:1) for a turbocharged unit. The 1.8-L engine was extensively modified to attain the higher output reliably. The pistons, connecting rods, and big-end bearings were uprated to accommodate the higher combustion pressures. The double-mass flywheel and clutch were modified to match the greater performance. The intake manifold, turbocharger, and exhaust manifold are new.

A Type K04 turbocharger forces air into the combustion chamber via two charge-air intercoolers. Compared to the less powerful 132-kW unit, a modified airflow path, together with a larger air cleaner, ensures that the air reaching the engine has a temperature only about 30C higher than ambient. This 80% charge-air intercooler efficiency keeps the engine supplied with an optimum flow of oxygen-rich air. Maximum boost pressure at the intake manifold can reach 200 kPa (29 lb/in2).

The engine's torque curve is impressive, with 280 N•m (207 lb•ft) available from 2200 to 5500 rpm. With it, the TT can accelerate from 0 to 100 km/h (62 mi/h) in 6.4 s and has a top speed in the region of 243 km/h (150 mi/h). Flexibility is also impressive, needing only 11.2 s to accelerate from 60 to 120 km/h (37 to 75 mi/h) in fifth gear. The TT equipped with this engine and quattro all-wheel drive has a total fuel consumption of 9.2 L/100 km, according to the EU 93/116 test.

The "lower-output" 132-kW (180-bhp) engine still manages a specific output of 100 hp/L. It uses a relatively smaller KKK Type K03 turbocharger, its lower moment of inertia allowing the engine to respond more rapidly to accelerator pedal movements. Boost pressure builds more quickly for reduced "turbo lag." Torque at lower engine speeds is aided by optimized throttle-butterfly and boost-pressure settings. Audi says the turbocharger and five valves per cylinder layout work ideally together, since the potential of the turbocharger can be used to the fullest extent by the large total cross-sectional area of the valves in each cylinder.

An even higher compression ratio of 9.5:1 ensures high efficiency and low fuel consumption. According to the EU 93/116 standard, total fuel consumption for the front-wheel-drive version is 8.0 L/100 km. Torque of at least 235 N•m (173 lb•ft) is available from 1950 to 5000 rpm. Front-wheel-drive and quattro TTs equipped with this engine can accelerate from 0 to 100 km/h (62 mi/h) in 7.4 s, while the top speed of front-wheel drive at 228 km/h (142 mi/h) is slightly greater than the 226 km/h (140 mi/h) of the quattro model. In fourth gear, the 132-kW TT Coupe can accelerate from 60 to 120 km/h (37 to 75 mi/h) in 9.8 seconds.

Both engines qualify as low-emission units according to EU III D. To accomplish this in the 165-kW powerplant, a secondary pump attached to the engine takes fresh air directly from the air cleaner and pumps it into the exhaust ports, where a post-combustion process occurs. The energy released heats the catalytic converter more quickly for greater emission-control efficiency.

Error 404--Not Found

Error 404--Not Found

From RFC 2068 Hypertext Transfer Protocol -- HTTP/1.1:

10.4.5 404 Not Found

The server has not found anything matching the Request-URI. No indication is given of whether the condition is temporary or permanent.

If the server does not wish to make this information available to the client, the status code 403 (Forbidden) can be used instead. The 410 (Gone) status code SHOULD be used if the server knows, through some internally configurable mechanism, that an old resource is permanently unavailable and has no forwarding address.