Stavros when you say high comp and big bhp per litre what figures did you have in mind?
Theres people on here running in the region of 450hp yb's on on anything between 7 and 8:1, obvioulsy theres a a few people below and above these figures but generally it seems sub 8 is favoured...yeah?
I think it would make things alot more understandable for and possibly make a better discussion if we had an example to work off rather than throwing different comp ratio's on different engines and different turbos...what do think?
Lets says a yb(obvioulsy), 500hp is a pretty round number, 7.5k rev limit, rs500 cooler and a gt30r. Firstly i'd want to work out as close as i could as to how much air this will need to see than kind of hp, i'd then see where in the comp map the turbo is likly to supply it while factoring in pressure drops and estimated cooling of the air at the given flow rate.........and so on
Looking at turbo mans example of act temp increase during compression surly we can guessitmate enough of the factors to give a good working out ballpark figure to what comp ratio we should be at?
Then all it would take would be to build and run this engine setup, test it, factor into the first equation the actaul data we would now have and recalculate to a more.....accurate target comp figure for the next build. Surly it would take long to get to a point where it dyno's at just the right comp ratio
Anyone with plenty cash please try out my theory.
Feel free to tell me to shut up if i'm talking pants