Jan.15 (GMM) BMW-Sauber technical director Willy Rampf is hoping for a significant lap time improvement with the German team's 2008 car.

After the Swiss based outfit unveiled the F1.08 in Munich, complete with a strikingly bigger front wing, Rampf told the German newspaper Bild: "If the car is less than half a second quicker than its predecessor, I will be disappointed."

Another noticeably new feature of the F1.08 are the carbon-fibre hubs on all four wheels, which are becoming commonplace in formula one.

BMW-Sauber proved that the novelty still needs some tweaking, however, when one of the covers fell off as Nick Heidfeld demonstrated the car inside the BMW Welt facility on Monday.

The 750 horse power machine will make its proper test debut at the Valencia circuit in Spain on Tuesday.