as said before, the idea for default engine tuning sliders is perfect. u can always reset ur tuning specs to a decent default setting and the more knowledgable can mess with theirs to make their car faster. most of u had no idea how to tune a suspension before gt so this would be no different. also, why do people think that identical cars with 300hp difference handle differently? its the same motor, same weight, etc... and if anything, tuning a suspension for higher power requires stiffening it anyway which can lead to better handling possibly. the only thing is if the car is turboed then ur gonna have bigger turbo on the higher hp car which will spool slower but that shouldnt matter since any smart racer will keep their rpms high and still win the race over the slower car. people shouldnt want a game to be realistic cuz of what they heard. some of u want this game to be so "realistic" that ur gonna undercut a lot of its benefits. that's why theyre making the game and not us. if they allow numerous 1500hp cars in gt4, is that gonna prevent anyone from buying it? i hope not. and about 3000hp out of a petrol motor...why is that so hard to believe? unless u know the exact limits of a motor and petrols power capacity, u can not say this. also, if it was possibly to continue to get highly compressed cool air to a motor, the power is limitless if the motor could take the strain of the compression. anyway, this doesnt even matter because fuel doesnt even flow thru a motor when they test block strenth, cylinder sleeves, piston rings, etc... why would they waste time hooking up sensors, fuel lines, microprocessors, and an ecu to get an engine to run right, just to see if it will break. u hook a shaft to the flywheel and transmit hp or torque (same thing) thru that. very simple.