Quote:
Originally Posted by Memphis1
Sorry marcw, not entirely true.
The speed limit of 155mph or 250kph, is the limit at which other components can withstand being pushed for an extended period of time. think about it in terms of the bugatti, the gasoline runs out in 12 mins at top speed because the tires will give out at 15mins. so it's a way of making sure your car lasts a good length of time because they know the consumer will be at risk and or doesn't have the budget like an F1 team to use an engine per race or three sets of tires per day.
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You, Sir, are correct.
Like any manufacturer, BMW has to make decisions based on cost. That includes potential litigation, especially in the U.S.
In the USA, the Z4 is limited to 130 mph without the sport package. This allows BMW to fit V-rated tires, which have a top speed of 149 mph, on its base 17" wheels.
With the ports package, the limited is set at 155 mph, and W-rated tires (good for up to 168 mph) are used.
Many manufacturers follow the 155 mph guideline for European models, lower settings in North America, and no limiter in the Middle East (for those crazy speed runs in the desert!)