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Fans of Audi’s RS6 Avant should examine these images closely. Our spies tell us this car is powered by a turbocharged version of BMW’s 5.0-liter V-10.

Small changes to the front fascia, exhaust, and the rear bumper indicate something is different with this M5 wagon. We’re hoping the rumors are correct and that this car will come to market with 600 horsepower under the hood.

Spring Rate is the amount of weight needed to compress a spring. Which mean how many pounds of weight are required to depress the spring by one inch. Springs are rated in LB/in (in metric system kg/mm).

For an example, we do have 2 springs which the first spring rated at 400g/mm while the second spring rated at 500g/mm. So it means that the first spring will compress 1mm if loaded with 400 grams while the second spring will compress only when loaded 500grams. Therefore we can conclude that the second spring is harder than the first spring. And now we know that springs with low spring rate are softer than those springs with high spring rate.

If there are 2 different values listed, it means that the spring starts at one rate, and ends at another rate under full compression.

For example: a 10lb to 25lb progressive spring will need 10lb to compress it the first inch, then 13lb the next inch, and so on, until the end of the travel; it will take 25lb to compress it the last inch. The benefit of this is that the spring can be soft enough at the start of the travel to offer a soft ride yet be stiff enough at the end of the travel to performance well during hard braking and turning.

There are 3 things that affect the spring rate:

1. Number of Active Coils (length / height of the coil spring): Determination of the active coil number varies according to spring design. Total coil number -2 for springs with both ends closed. Count the total coils -1 for springs with one end closed and one end open.

As the number of active coil decrease, the spring rate increases.

The overall outside diameter of the spring (mm) - diameter of the wire (mm)

When diameter of the suspension spring increases, the spring rate decreases.

Normal Springs has a fixed spring rate.
Step Linear Springs are springs which have 2 different spring rates.
Progressive Springs have a variable spring rate.

March 25th Happiness, March Plus Safety and March KISEKAE

TOKYO (Nov. 8, 2007) -- Nissan Motor Co., Ltd. today announced the release of three special edition models - March 25th Happiness, March Plus Safety and March KISEKAE - featuring unique specifications to commemorate its 25th anniversary. The three anniversary models went on sale today at Nissan dealers across Japan.

The March 25th Happiness, based on the March 12S and 14S FOUR models, comes in an exclusive Silky Beige body color. Interior-wise, the model features an odor-absorbing headliner, automatic interior lighting system and other additional equipment options, offering customers' greater value.

Based on the March 25th Happiness (2WD/4WD), 12E and 14E FOUR models, the March Plus Safety is fitted with a host of features for enhanced occupant safety, including SRS side airbags for the driver and front passenger, SRS curtain airbag and Xenon headlamps (low beam with an automatic levelizer).

The March KISEKAE, based on the March 12S and 14S FOUR models, offers a choice of two exclusive seat covers - Bubbly or Striped* - to suit the individual styles of the customer. The model offers exclusive interior trims and pedals to match the seat upholstery. True to its name, the March KISEKAE (meaning "dress up" in Japanese) allows customers to customize the interior such as the seat covers, according to their personal tastes.

Petronas BMW E90 engine sound