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Message: <blockquote data-quote="B33mEr" data-source="post: 316425" data-attributes="member: 13609">30% is to be on d safe side i guess ... cos there are so many variables involved when estimating whp ...  heat, friction, metal fatigue plays a major role. I guess a dyno run is the most accurate result you can go for even that is not the end of it as different dyno have different ways of calculating hp at the crank and drivetrain loss for whp. But for me i trust my butt dyno hehehe it's free lol. as long you keep heat and friction, major cause of metal fatigue plus wear and tear, to a minimum then you will have more ponies to the wheel.FYI ... sum ppl will inflate their tyre up to 50 psi on dyno runs to minimise friction and maximise whp results so that it will look good only on paper ... there are few tips n trick to maximise whp just for the dyno's but very dangerous if apply on the roads ...</blockquote>