BMW unveiled the 3-Series Convertible in Spring of 2007. The model comes with a three-piece electronically-operated retractable hard-top – a first for BMW.Stowed or raised in approximately 22 seconds, the new roof has been introduced, not only for added security, but also for better visibility and a greater feeling of space and light for occupants. Because the roof features a larger rear glass windscreen and side windows, visibility has improved by 38 per cent compared to the outgoing 3 Series Convertible.
The new High-Precision Direct Injection system on the BMW 3 Series Convertible uses centrally-mounted piezo crystal injectors spraying atomised fuel vapour directly into the combustion chamber. Combined with Bi-VANOS variable valve technology the system delivers the most efficient burn of fuel for maximum power and parsimonious economy. The fruits of this technology are highlighted by the impressive performance figures posted by all of the petrol-powered 3 Series Convertibles.
BMW 3-Series Convertible
The 325i Convertible with its all-new 218hp six-cylinder engine develops 270Nm of torque. The open-topped 325i covers the 62mph sprint in 7.6 seconds and can attain a top speed of 152mph. However, it is still capable of a combined consumption figure of 35.8mpg.
Representing the flagship of the range is the 335i Convertible with its twin-turbocharged 3.0-litre engine. Using an aluminium cylinder block rather than the magnesium alloy unit from the 325i Convertible, but with the added benefit of lag-free forced induction, the 335i posts a zero to 62mph time of 5.8 seconds. The 306hp engine, higher than the output of the E36 BMW M3, has been restricted to a 155mph top speed. Fuel consumption on the combined cycle is 28.5mpg. Peak torque of 400Nm from just 1,300rpm through to 5,000rpm gives the driver a real surge of effortless power, acceleration and flexibility.
The 2009 G37 Convertible will be inspired by the 2008 Coupe version; this means it will combine the same exhilarating performance, stunning styling and modern, sporty interior of the original Infiniti G Coupe.
Under the hood of the Convertible version we will see a 3.7 liter V6 engine with an output of 330 hp and a peak torque of 269 lbs-ft. The engine will be matted with a a choice of an upgraded electronically controlled 5-speed automatic transmission with manual mode, downshift rev matching, DS mode and ASC (Adaptive Shift Control) that allows for quicker shifts in sporty driving situations and available genuine magnesium paddle shifters; or a newly revised, lightweight 6-speed manual transmission.
Infiniti G37 Convertible
The G37 Convertible will be build on the FM (Front Mid-ship) platform, which has been stiffened 36% from the previous generation, is lower in overall height and has a wider front and rear track width.
Also there are rumors that Infiniti is working on a more powerful version of the G37: an all-wheel drive, twin-turbocharged version that will have an output of 500 hp. This mean that the 2009 G37 will be even more powerful like a GT-R. So, it will reach at least a top speed of 185 mph and the 0 to 60 mph sprint will be made in less than 4 seconds.