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Message: <blockquote data-quote="f8." data-source="post: 114749" data-attributes="member: 923">icic, thanks calvin!fabian, the slight annoyance with dyno plots is that they only represent what happens under fixed condition(usually wide open throttle).i suppose if we optimise based on this curve and we only drive at WOT all the time then it will be optimal.but dyno plots don't tell us what happens at say 20% throttle, or, 65% throttle. so if we have a curve that says at 5000rpm the on wheel power is 150hp, that would be at WOT. conceivably at 20% throttle it is a lot less but how much so? and what is the lambda then?and then there are car specific items such as condition of fuel pump and injectors, ignition coils and ignitors, even spark plugs right down to gapping that influence how much is too much. also grade of petrol, and air conditions.of course what i have mentioned only comes into play when you are really pushing at the edge. car manufacturers tend to err on the safe side with a lot of margins such that these factors will drown in the noise floor. but i always have an impression of the word tuning, to really be, fine tuning and custom. to really squeeze every drop out and not throw the towel in at 1/3rd turns.</blockquote>