I agree about the speed claims, but I am pretty sure there is no brick wall either - I don't recall seeing 180mph in the aerodynamics equations when I used to mess about with them
Top speed is a tradeoff between slippery shape to reduce drag and enough down force to stop you taking off. For the cossie, the limit is probably the downforce generated by the spoiler driving the car down into the tarmac at the speeds mentioned - take the spoiler off though and ... well you take off More power = more speed if you get the aerodynamics balanced
I'm a simple soul though and since drag goes with speed squared and power ~ 1/speed, I always reckon speed increases with power cubed.
So if a car generating 100BHp can do 115mph, then
- one generating 300BHp (Z) can do 115 * (300/100)^(1/3) or 165mph
- one generating 400BHp (FI Z or Monaro) can theoretically do 182mph
- one generating 631BHp (Murcie) can theoretically do 212mph (stats say 211 )
- one generating 1000 BHp (Veyron) can theoretically do 247mph (you can read elsewhere about the issues bugatti had reaching the theoretical max speed and it needs to be in a certain aero configuration to achieve it)
By the above, you need in excess of 530BHp to be able to achieve 200mph
I'm sure people can find examples to completely disprove the above, but it does work for most cases
he dont care what I say
None of us do