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Message: <blockquote data-quote="flamefox850" data-source="post: 189122" data-attributes="member: 140">yerp..that's true.....IF we talking about same temperature generate by the 2 turbos and how much boost can they blowbut what i mean by "bigger compressor blades less 'grind' the air for given boost thus making more hp." is :PV=nRT , P = constant (mean same boost between small and big turbo), eg. 1.5barV=same, R=same...so, n will be higher (more mass) as T is lower becos using bigger compressorone more thing to remember, engine is not a big tank that u fill with pressure instead u r filling intake manifold with pressure with a 'hole' that leak. that 'hole' is combustion chamber. our turbo does not spin at constant speed to make full boost all the way...let say it spin 100k rpm to get 1.5bar@4500rpm (engine speed) then it speed up to 250k rpm to get same 1.5bar@6000rpm(engine speed)so, to catch up engine rpm that leak so much air/pressure in intake manifold and to maintain the boost set, bigger turbo with higher cfm(high power blowing) in needed. it will spin at lower speed at lower engine rpm but medium speed at higher engine rpm.small turbo can't do this job as it has it's own efficiency rate (lower eff, higher temp at higher boost). small turbo has to spin even more faster probably 300k or more rpm to get the same boost. and spining faster means more heat.</blockquote>

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