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  1. #1
    Join Date
    Apr 2003
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    How to drive fast but safely

    The speed is a real matter in our world, too many crashes on the roads, too many stupid drivers. And the top of this stupidity is the "Street Racing".
    We all love speed. It's impossible to love sprtcars and to hate speed.
    But when you are making speed you must have some good skills.

    I think the speed don't kill, it's stupid drivers who kill or drunk or fly drivers.

    There are some good stuff if you plan to beat your speed record:

    - Never be distract by others things
    - the focus must be and must stay the road
    - Never overtake by the right lane
    - You must be able to hit the break when you see a car at 100m in front of you
    - If you are tired slow down
    - If you think that your car has a problem, slow down
    - Always check the speed limit of your tires
    - Always check the pressure of your tires
    - Don't try to prove that you are Schumacher
    - Don't try to hit the speed limit if you are not an experimented driver ( minimum 5 years of experience)

    That's my experience and that's what I use to apply me and my friends.


    Speed Rating

    In Europe, where selected highways do not have speed limits and high speed driving is permitted, speed ratings were established to match the speed capability of tires with the top speed capability of the vehicles to which they are applied. Speed ratings are established in kilometers per hour and subsequently converted to miles per hour (which explains why speed ratings appear established at "unusual" mile per hour increments). Despite the tire manufacturer's ability to manufacturer tires capable of high speeds, none of them recommend the use of their products in excess of legal speed limits.

    It is important to note that speed ratings only apply to tires that have not been damaged, altered, under-inflated or overloaded. Additionally, most tire manufacturers maintain that a tire that has been cut or punctured no longer retains the tire manufacturer's original speed rating, even after being repaired because the tire manufacturer can't control the quality of the repair.

    Over the years, tire speed rating symbols have been marked on tires in any of three ways shown in the following examples:

    225/50SR16 225/50SR16 89S or 225/50R16 89S

    Each of these was an acceptable method of identifying speed ratings.

    Early tires had their speed rating symbol shown "within" the tire size, such as 225/50SR16. Tires using this type of branding were not to have been produced after 1991.

    225/50SR16 112 mph, 180 km/h
    225/50HR16 130, 210 km/h
    225/50VR16 in excess of 130 mph, 210 km/h

    Beginning in 1991, the speed symbol denoting a fixed maximum speed capability of new tires must be shown only in the speed rating portion of the tire's service description, such as 225/50R16 89S. The most common tire speed rating symbols, maximum speeds and typical applications are shown below:

    N 87 mph 140 km/h Temporary Spare Tires
    P 93 mph 150 km/h
    Q 99 mph 160 km/h Studless & Studdable Winter Tires
    R 106 mph 170 km/h H.D. Light Truck Tires
    S 112 mph 180 km/h Family Sedans & Vans
    T 118 mph 190 km/h Family Sedans & Vans
    U 124 mph 200 km/h
    H 130 mph 210 km/h Sport Sedans & Coupes
    V 149 mph 240 km/h Sport Sedans, Coupes & Sports Cars

    When Z-speed rated tires were first introduced, they were thought to reflect the highest tire speed rating that would ever be required, in excess of 240 km/h or 149 mph. While Z-speed rated tires are capable of speeds in excess of 149 mph, how far above 149 mph was not identified. That ultimately caused the automotive industry to add W- and Y-speed ratings to identify the tires that meet the needs of new vehicles that have extremely high top-speed capabilities.

    W 168 mph 270 km/h Exotic Sports Cars
    Y 186 mph 300 km/h Exotic Sports Cars

    While a Z-speed rating still often appears in the tire size designation of these tires, such as 225/50ZR16 91W, the Z in the size signifies a maximum speed capability in excess of 149 mph, 240 km/h; the W in the service description indicates the tire's 168 mph, 270 km/h maximum speed.

    225/50ZR16 in excess of 149 mph, 240 km/h
    205/45ZR17 88W 168 mph, 270 km/h
    285/35ZR19 99Y 186 mph, 300 km/h

    Most recently, when the Y-speed rating indicated in a service description is enclosed in parenthesis, such as 285/35ZR19 (99Y), the top speed of the tire has been tested in excess of 186 mph, 300 km/h indicated by the service description as shown below:

    285/35ZR19 99Y 186 mph, 300 km/h
    285/35ZR19 (99Y) in excess of 186 mph, 300 km/h

    As vehicles have increased their top speeds into Autobahn-only ranges, the tire speed ratings have evolved to better identify the tires capability, allowing drivers to match the speed of their tires with the top speed of their vehicle.
    Last edited by Swissbeatz; 02-03-2004 at 09:07 PM.
    Il me faut une caisse dans les 300 et le GPS

    BMW Z3 1.9L (sold)
    Mercedes SLK 230 (sold)
    Jaguar XK8 (sold)
    Porsche 996 Carrera 4 (for sale)
    2004 Mini Cooper
    Mercedes 2005 SLK 55 AMG (ordered)

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