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Message: <blockquote data-quote="TE27levin" data-source="post: 105351" data-attributes="member: 713">vtec b16a run quite high duration cams, it good for n/a to have more overlap at high rpm to keep the pressure at high rev to make more power. so before the vtec kick in it will need to run lower duration to keep the pressure or else the air will push out from intake to exhaust.for turbo you don't need a high duration cams, that why most vtec turbo unable to perform well if u only touch on fuel/ignition management and forged internal.with stock cams, intake side will blow the pressure out to exhaust if the exhaust valve don't close tight to hold the air in time. vice versa the pressure at exhaust side hot exhaust air will force go into the piston and cause the burned air stay inside the camber. Beside that turbo size also a issue, for a example 4AGE with stock camshaft 232duratioin 7.3lifting using a t25 from a CA18 engine it only can hold around 1bar from 2500rpm up to redline 7000rpm. above 7000rpm u will get all the hot air and turbo start to suffer. if u go over 1.3bar turbo will not giving power above 5000rpm.b20b block will work better with stock b16a cams cuase the longer stroke will bring the power band lower. Get a sets of high lifting cams but lower duration will perform better.</blockquote>

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