Colin Chapman was fanatical about making his Lotus' as light as possible, often to the extreme, which resulted in his cars being a bit fragile. However, the importance of 'lightness' and how it affects the power to weight ratio of a car cannot be overlooked.
A standard 230S Fintail develops about 84hp on the back wheels and weighs a hefty 1410kg, which results in a power to weight ratio of about 59bhp per ton.
My Finny racer now develops 105hp and weighs 1200kg and the resulting power to weight ratio is 87bhp per ton.
However, if you wanted to get the same power to weight ratio out of your standard 1410kg Fintail as I have in my racer, you would need to get 123hp off the back wheels, and that ain't going to happen without a kompressor!
By losing 50kg of weight in my racer - 1150kg - but keeping the same 105hp, the power to weight ratio increases to 91hp per ton.
So, how do you get your car to perform? Just add some lightness, as Colin Chapman said.