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Message: [QUOTE="Extended Power, post: 272496, member: 898"] Like Charles mentioned in the last sentence: "Engines start getting very happy and willing to make power when drive drops below boost." That is because the engine is a huge air pump. If you can forget about the cylinder pressures for a minute... If the exhaust pressure leaving the engine...and driving the turbo/turbos is 80 psi, and the boost entering the engine is 80 psi...the engine will be able to flow more efficiently, then if the exhaust pressure was at 80 psi, and the boost was at 40 psi. (The engine has to "Work" harder to push the exhaust from the engine... Camshafts come into play as well... Valve lift, open and closed duration, as well as valve overlap all play a part in it... eg: 2 camshafts have the same amount of lift, but one of them has no valve overlap. The camshaft with no overlap would prolly spool a turbo like crazy, but the engine would prolly only rev to about 2000 rpm. The same camshaft, but with more overlap would not spool the turbo as easy, but would have more midrange and top end power. Hope this helps a little bit anyways... [/QUOTE]

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