BMW Z3 V12
in autocarBMW has lifted the veil of secrecy on a wild V12-powered version of the first-generation Z3.
The experimental prototype, created by BMW’s research and development division, was built as an engineering exercise with the aim, in the words of one BMW source, “to see how far we could stretch the concept”.
No firm details on the one-off Z3 have been forthcoming, although it is thought to run BMW’s M73 engine. Used in the earlier 750i and 850Ci, the big V12 boasted a capacity of 5.4 litres and kicked out 321bhp and 361lb ft of torque.
By comparison, the most powerful first-generation Z3 model, the Z3 M Roadster, used the 3.2-litre straight six from the M3 with 321bhp and 261lb ft.
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Parece que o V12 foi posto dentro do Z3 para "demonstrar" que qualquer que seja o tamanho de um motor, este cabe num roadster. A única vez que ele foi testado foi pela revista Autozeitung. Como já referido, o carro tinha uma potência de 322 cv (o Z3 M debitava 321 cv) e 490 Nm (o Z3 M tinha 353 Nm) de binário máximo às 3900 rpm. A caixa é manual e tem 6 velocidades.
De acordo com a publicação alemã, o carro faz 0-100 km/h em 5.5 segundos, conseguindo percorrer a distância de 1000 metros em 24.4 segundos. A sua velocidade máxima é de 263 km/h.
As jantes do carro são de 17". Os pneus têm as seguintes medidas: 225/45 à frente e 245/40 atrás. O carro tem um peso de 1400 kg.
After breaking the photo story on the BMW M division's one-off, V12-powered Z3 prototype earlier this week, we can now share with you some interesting details surrounding its creation, though as you will soon find out, we may need the help of our German speaking readers.
We'll get straight to the point and let you know what Matthew Russell, Product and Technology Communications Manager for BMW North America, told Carscoop about the Z3 M V12 after he did some digging of his own:
"The car was built in 1999 and was the proof that all engine sizes of the time fit in the roadster," said Russell. "It was shown only once: in August 1999 to the German car magazine Autozeitung."
As we rightly assumed, the ultimate M model of the Z3 roadster series borrowed BMW's M73 5.4-liter V12 engine from the E38 750i/iL sedans and E38 850Ci coupe of the mid-1990s to early 2000s.
The 12-cylinder engine was rated at 322hp (326PS) at 5,000 rpm and 490Nm (361 lb·ft) at 3,900 rpm, and was linked to a 6-speed manual gearbox driving the rear wheels.
According to the 1999 article from Autozeitung, the Z3 M V12 was capable of accelerating from standstill to 100km/h (62mph) in 5.5 seconds, to 1,000m (0.62 miles) in 24.4 seconds, and reach a top speed of 263 km/h (163mph).
By comparison, the production Z3 M Roadster model sported an M3-sourced 3.2-liter naturally aspirated straight-six delivering 321hp (325PS) and 353 Nm (261 lb·ft) in EU specification.
We also learn that the Z3 M Roadster V12 was fitted with 17-inch wheels in 225/45 tires up front and 245/40 at the back and that it tipped the scales at a hefty 1,400kg (3,086 pounds).
As mentioned in the beginning of our story, we’d appreciate it if any of our German-speaking readers could provide a translation of the main points mentioned in the magazine article.
Scans da revista:
Alguns leitores do Carscoop traduziram alguma coisa, como eu não percebo de alemão, não sei se estão correctos:
AutoZeitung mentions that they drove it on a BMW testcourse near Munich during a solar eclipse on August 11th 1999. It was a rainy day so they had to stopp snapping or driving the car several times.
They say that the project was commissioned by Dr. Gerhard Schmidt, the head of drivetrain development to compare different engine configurations and just to see if it was possible at all!
It took 3 engineers about 3 month to convert an arctic blue M Roadster into this orange beast.
They took the gearbox from a 850 ci
They had to modify the radiator, oilpump, oilpan, the exaust manifold, some other details and stiffened the springrates.
The car rather wants to go sideways through turns which doesn't make sense but sure is a lot of fun!
It has wheelspin from first through third gear and the engine produces 400Nm. already at 1000 rpm.
Fonte: Carscoop
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