I need help on how to make my bike faster Hi Just wanted to ask how to make my bike faster. 

Do I change the front chainring to a larger one, if so do I have to get a whole new drive train or can I just get another shimano large ring. Can I get a smaller cog at the back, will that make my bike faster?

Please take a look at my bike. here are the specs 

Shifters: R660 Shimano trigger, Front derailleur: R453 Shimano, Rear derailleur: Shimano Sora, Cassette: FAC MICHE 9s 12X26 Bottom bracket: FC453 Shimano 50/39/30, Chain: KMC Z9000

here's the site with more information 
http://www.btwin.com/en/fitness-road-bikes/3856-b-twin-forme-5.html

I just want to know if I can change anything to make it faster but I don't know what to change. thanks 

Thanks 

David
There's a nice gear calculator at Sheldon's site. I did a quick calculation for you, and at 50/12, at 90 RPM, you should be going 47.4 km/h.  If you upgraded your front chainring to a 54, and your back cassette to go down to 11, at the same RPM you could go 55.8 km/h, which is a significant increase.  You can play around with different options on the calculator to see how much it would help to get different gearing combinations.

You might find that you won't get much extra speed out of bigger gears as your bike has a somewhat upright posture and therefore you'll be quite limited in what kind of speed you can get.  I think that 50 km/h is plenty fast for a bike and that you should just focus more on going faster on the flats and uphills.