Subaru Impreza WRX Cars Modifications

Specifications :

Tuner : Alex Witkin
Basic Car : Subaru Impreza WRC 2002
Power : 403 hp
Bodykit : C-West bodykit
Bumper : APR carbon-fiber air splitters
Other : installed a remote map selector, a test and up pipe and a high-performance boost controller all straight from the Turbo XS catalog, To mix quality-fed fuel into the chambers, Witkin fit in a dual Walbro high-flow fuel pump, and customized and flow tested 780cc fuel injectors

Sport Cars Tuning Audi A4 Special Executive Vehicle

Unlike the A2 model which was originally designed as a three door hatchback vehicle which later all and became more of a luxury family car, the Audi A4 which is also manufactured by the same German automotive maker "Audi" is a luxury executive car which can also be classified as a compact vehicle. According to the enumeration you might think that this is the successor to the A2 but, it actually is a successor of the Audi 80.

This version became available as an "Advant" which is the name that Audi gave to station wagons and also to estate cars. The A4 was also available as a Cabriolet and sedan. The production of this vehicle started in 1994 and ever since its introduction to the market there have been for generations (or versions) of this model.

The B5 platform-based Audi A4 was sold between 1996 and 2001. The top Audi A4 engine in Europe was a 2.8l V6, one of nine engines shoppers could choose from in Europe. In North America the only Audi A4 engine available at launch was the 2.8l V6, which was also the sole engine available in its predecessor, the 80 model.

This Audi A4 engine is a 90 degree V6 with a cast iron block and alloy cylinder heads. In its original form it has twelve valves opened by single overhead cam (SOHC) heads. It produces 174 horsepower and 184lb ft. torque.

Note that while Audi often shares parts with its parent company Volkswagen, this Audi A4 engine is not related to VW's VR6, even though this engine was offered in similar sizes and power outputs. In more recent years both the 90 degree motor and the VR6 have been place in the Audi A4's engine bay. While Audi A4 engine is smoother and more powerful, it is heavier than the single head VW unit.

The Audi A4 engine uses a variable length intake manifold. This manifold has two intake tracks. At slow speeds, air is directed through a long intake track for better torque, while at high speeds air comes through a very short track for improved breathing, providing top end power. This gives similar performance to early two-stage variable intake valve systems without the complexity.

While the Audi 80 used the AAC version of the 2.8l, the Audi A4 engine got the revised AFC version. These changes mainly affect the head design, using a lighter camshaft with revised valve timing, a simpler, lighter valve spring assembly, and smaller diameter intake and exhaust valves. The oiling system was also upgraded, with a larger oil cooler, larger filter, and more effective oiling system. While it may be possible to put an AAC motor in an A4, the original Audi A4 engine is more reliable thanks to these upgrades.

A new head with five valve per cylinder was developed by Audi Sport for use in touring car racing and eventually made its way onto several of Audi's engines, starting with the new 1.8l turbo, and eventually the 2.8l. This Audi A4 engine choice included this new 30 valve layout in Europe starting in 1996, and would replace the 12 valve engine in the American market when the car was refreshed in 1998. Power went up to 190 hp 203 lb. ft. of torque. The head also has dual overhead cams, but everything outside of the heads is similar to the twelve valve engine.

The Audi A4 engine gained twin turbochargers in the S4, the A4's sports model. Different pistons were used changing displacement slightly: Officially it is a 2.7l engine, although it was sometimes quoted as being a 2.8l. This engine produces 261 horsepower and 295 ft. lbs. of torque. The 2000 and 2001 A4-based RS4 used a version of this engine modified by Cosworth Technology to produce 375 horsepower and 325 ft. lbs. of torque. This car was never sold in America, and the engine doesn't make a good Audi A4 engine swap candidate due to the width of the engine. The RS4 uses wider front body panels to accommodate the extra piping and larger turbo added by Cosworth.

Audi A4 engine choices expanded with the introduction of the B5 platform in 2001, but the 2.8l was replaced by a new 3.0l after being used for over a decade in Audi's lineup.

Performance BMW Z4 2011 The BMW Twin Turbo Power Unit

1.BMW Z4 2011 The BMW Twin Turbo Power Unit

The twin-turbo straight-six power unit already giving the BMW Z4 sDrive35i truly impressive dynamics and all-round performance is characterised in particular by its spontaneous and direct response to the gas pedal, fascinating free-revving performance, and unusually economical use of fuel for a car in this class.the BMW Twin Turbo power unit uses two small turbochargers which, through their low inertia, cut in from the start at relatively low engine speeds, each supplying three cylinders with compressed air. As a result, power and performance are built up with a level of spontaneity quite unusual on a turbocharged engine. The turbocharger system developed for the power unit of the new BMW Z4 sDrive35is maintains a high boost pressure throughout the entire load range. Peak torque now increased to 450 Newton-metres or 332 lb-ft comes from a low 1,400 rpm and is maintained consistently all the way to 4,500 rpm. Maximum output of 250 kW/340 hp, in turn, is delivered at 5,800 rpm.

2.BMW Z4 2011 The BMW Twin Turbo Power Unit

Modified engine management on the BMW Z4 sDrive35is also allows the use of an Overboost function briefly increasing engine torque under full load by another 50 Newton-metres or 37 lb-ft. The peak thus offered of 500 Newton-metres/369 lb-ft gives the car particularly fast, dynamic and powerful acceleration, the BMW Z4 sDrive35is completing the sprint from a standstill to 100 km/h (62 mph) in just 4.8 seconds. When accelerating in the BMW Z4 sDrive35is, the driver feels the additional torque and muscle particularly at medium and high engine speeds. Following the policy of the BMW Group, finally, top speed of the BMW Z4 sDrive35is is limited electronically to 250 km/h or 155 mph.

3.BMW Z4 2011 The BMW Twin Turbo Power Unit

The BMW Z4 sDrive35is offers its outstanding power and performance consistently at all times.This unusually good balance of performance and fuel consumption results from the fundamental design and layout of the six-cylinder combining BMW Twin Turbo Technology with High Precision Injection. So once again, the qualities of direct gasoline injection featured in this engine come out very clearly, piezo-injectors positioned in the cylinder head between the valves and therefore in the immediate vicinity of the spark plugs ensuring particularly precise dosage of fuel and a clean combustion process.

4.BMW Z4 2011 The BMW Twin Turbo Power Unit

Further technologies offered as standard by BMW EfficientDynamics such as Brake Energy Regeneration, EPS Electric Power Steering and on-demand control and management of ancillary units likewise help to reduce both fuel consumption and emissions.

5.interior BMW Z4 2011 The BMW Twin Turbo Power Unit

The seven-speed Sport Automatic with double clutch operation featured in the BMW Z4 sDrive35is likewise offers the very best in driving dynamics and efficiency. A particular highlight in this case is the two-mass flywheel laid out particularly for an even higher level of power and performance, offering even greater strength and stability and naturally handling high engine torque of up to 500 Newton-metres or 369 lb-ft without the slightest problem.
6.BMW Z4 2011 The BMW Twin Turbo Power Unit

The control map on the seven-speed Sport Automatic transmission with double clutch has naturally been tailored to the particular power and performance of the engine, thus further enhancing the superior sportiness of the BMW Z4 sDrive35is to an even higher level. Particularly when shifting gears manually and in conjunction with the SPORT and SPORT+ modes of Dynamic Driving Control, the transmission offers a most dynamic experience through modified gearshift points, optimised selection of gears and an even greater increase in torque before shifting.