I know Im no expert, but I like to think I have a basic grasp that a warm day means you are not getting as much power/higher air charge temps/IC not working as effeciently etc etc

Ive been trying to explain this to someone on another forum and he just cant see it, anyone care to set the facts straight/feel free to comment on James' ideas too

http://www.vauxhallownersnetwork.co....d.php?t=107484