You could beat most off the line?! Doubt it! You wouldn't even beat my Uno 1litre! It's nothing bad against your or your car but it is just the matter of physics, a 900cc engine producing 39-41bhp (figures taken from parkers) can't out run 99% of other cars because although yes, it is a light car, it has very little power and most cars have more power/unit weight.
Again, it isn't anything bad towards the cinq, it just wasn't intended for that purpose. Even with good gearing, it just won't be powerful enough to beat much just due to the design of the car.
It doesn't matter how well it has been looked after hugely, it will never be much fast than about 16 seconds + 0-60. Granted, if you race a 70 year old granny in her Porsche you might outrun her but you cant expect much else.
Paul
My first signiture (a lot of thought put into it): If you can't find the switch to switch your fogs off I am sure I can help you! Damn fogs.