This shows how the EDS diffbrake system makes the car move out of this diagonal wheel spin. with only open differentials, one front and one rear wheel would spin, and even if the spinning front wheel got contact with the ground, so that both front wheels had traction, the car would NOT move without EDS, because the torsen center diff cannot transfer any torque if one of the axles loses traction completly, as if one rear wheel is off the ground like in this video, then that would be the only wheel that would spin, all others would stand still. So the EDS uses the brake to brake the spinning rear wheel so the other side that has all the weight also gets some torque and add a overall load to the rear axle, making the torsen transfer equal torque divided by the built-in Torque Bias Ratio (TBR) witch i guess is 1:3 on this car, so the front wheels gets the rear wheel torque divided by 3, witch makes the car move.
Audi: The quattro principle
quattro four-wheel drive enjoys a lengthy tradition. The principle involves
distributing the engine's power permanently and optimally between all four
How a Differential Works and Types of Differentials
Video I created for Toyota in 2007. This was produced on a budget but its
purpose is to explain the concepts and not be a Pixar-budget film.
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snow chains - next generation (part one)
Universal snow chains, fits to all tire sizes, for all wehicles, trucks,
Exelent performances, improves grip and braking on ice.
No vibrations on steering wheel.
- wannabe dealer:
500 hp Audi S4 quattro vs 12"+ of fresh snow! Unstoppable...
Last night we enjoyed a great winter storm, well over 12" (30 cm) at my
house. I wanted to see if my lowered Audi S4 on Dunlop Wintersport 4D snow
tires was up to the task going through such deep snow.
A guest appearance is made by my 6 hp Subaru powered Ariens Snowblower
Audi A4 Allroad vs. VW Passat Alltrack OFFROAD
In October 2010 Volkswagen presented at the 2010 Tokyo Motor Show the
Passat Alltrack. The Passat Alltrack bridges the gap between the passenger
VW range and the SUV range comprising the Tiguan and Touareg.
The Passat Alltrack has raised ground clearance from 135 to 165 mm which
improves approach angle from 13.5 to 16 degrees, departure angle from 11.9
to 13.6 degrees and ramp angle from 9.5 to 12.8 degrees when compared to
the standard Passat wagon. Passat Alltrack is the only VW in the passenger
range to offer 4Motion with off road driving programme, the off road system
works in conjunction with the ABS, electronic differential lock (EDL), DSG
& hill descent assist system to control the vehicle in an off road
The engine range of the Passat Alltrack consists of two 2.0L TDI with
outputs of 103 kW/140 hp & 125 kW/170 hp and two petrol engines, 1.8L
producing 118 kW/160 hp and 2.0L TSI producing 155 kW/207 hp. The TDI
models come standard with BlueMotion Technology packages with Stop/Start
system and battery regeneration mode for recovering braking energy. The two
lesser powered engine variants 2.0L TDI and 1.8L TSI are only available in
front wheel drive format with a manual 6 speed transmission. The rest of
the range with 4Motion has a 6 speed DSG automated manual transmission,
except the 2.0L TDI with 103 kW/140 hp has an option of 6 speed manual.
In 2012 at the New York Auto Show, VW showed a Passat Alltrack with 2.0L
TDI 125 kW/170 hp under Alltrack Concept nameplate to gauge response for a
future market in the offroad wagon segment.
Audi released the first official pictures of the B8 series A4 in August
2007, and unveiled the car to the public at the September 2007 Frankfurt
Motor Show. Saloon/sedan and Avant (estate/wagon) models are offered. The
Avant was unveiled to the public at the March 2008 Geneva Motor Show.
The B8 A4 is built on a variant of the Audi Modular Longitudinal Platform,
a platform which is also used in the Audi A5 coupé. Whilst prior A4
chassis were limited in wheelbase due to the relationship between the
engine, transmission and front axle, the MLP allows for a reduced front
overhang, resulting in a greater wheelbase length without the same increase
in overall length. This effectively redistributes the centre of gravity
slightly rearwards, improving handling by better balancing vehicle mass
between the front and rear axles. The estimated static front:rear weight
ratio of the B8 A4 is approximately 55:45, depending on body style and
engine. The relocation of the steering rack in front of the axle also
improves handling over previous A4 platforms.
The B8 A4 has increased in wheelbase by 160 millimetres (6.3 in) and in
length by 117 millimetres (4.6 in) over the prior B7, which has allowed for
increased rear seating legroom. Although the overall dimensions have
increased, the kerb weight has dropped some 10%. The boot (trunk) has also
increased to 480 litres (17.0 cu ft) for the saloon (sedan) version. The A4
Avant will have a maximum capacity of 1,430 L (50.5 cu ft) with the rear
seats folded down.
Reception has been mixed, with praise for the Audi A4's increased size,
giving it best-in-class rear legroom and trunk space in the compact
executive car segment. Its inline-4 2.0 TFSI engine, while efficient
providing plenty of torque, was considered lacking and less refined
compared to 6-cylinder engines of lighter rivals who posted faster acceleration times. However, the Audi
S4 sports sedan has been well-received for its V6 3.0 TFSI engine's power
The B8 A4 was facelifted in early 2012, and is on sale now.