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Message: <blockquote data-quote="Battousai" data-source="post: 188636" data-attributes="member: 267">let musang padawan tell u what i know..so, cfm in real world means how fast a turbo can reach it's full boost (that we set), . Actually, its how much air the turbo can flow at its peak efficiency. If, for example a turbo is at its peak at 1.2 bar, when you boost it up to 1.5 bar, you start losing power because the air is too hot, the turbo is spinning too fast and it simply cannot flow that much air. When you push the turbo too hard (high boost, high RPM) you'll find boost pressure starts to drop off.Turbo with higher cfm can compress more air (higher boost eg. 1.8bar) into the engine in just a blink of an eye, after it start spooling la..not including the lag time. then, higher cfm turbo will get full boost faster and create max torque at a lower rpm..but lag is the problem. when it's start spooling then air will suddenly rush into the engineI'm not sure about the getting full boost faster. It depends on whether the turbo is correctly matched to the engine. You can slap on a big-ass high CFM turbo to a L5 engine and it'll NEVER make full boost.but not to forget, bigger compressor blades tends to create less heat when compressing air compare to smaller blades..this is becos bigger blades needs only low speed spooling to compress given boost compare to smaller onesless heat = more powerIt's not the compressor blades that create heat. Compression of air creates heat. The tighter you compress air, the hotter it gets. It follows that if you want a lot of air to flow thru a small turbo, you must compress it a lot, therefore causing heat.*the comparison of lower and higher cfm turbo should be on the same engine and same rpm rangeFor comparison sake, yeah. But we're only talking about the compressor side, without even considering the exhaust side. A turbo that flows more, will flow more whether you put it on an engine or a hair dryer.</blockquote>

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