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Single Turbo question
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<blockquote data-quote="CPRsm" data-source="post: 13804661" data-attributes="member: 81705"><p>Eric beat me to my long winded post. Posting while watching cartoons with kids makes simple things take too long lol </p><p></p><p>Idk the cam specs on those. But as a generalization you're going to give up low and midrange for top end. If the cams are small enough to maintain a good intake closing event, you could gain top end without losing it down low. The duration is a big reason for losing power down low. The longer the duration the earlier the valves open, and later they close. </p><p></p><p>An intake valve actually closes after bottom dead center and is heading to TDC. Closing the intake earlys give the piston more time to make compression. It also can cause detonation.</p><p></p><p>Exhaust valve can cause a power lose as well. Long duration makes the valve open early. Holding the exh valve longer give the combustion process a longer amount of time to push on the piston to create torque. After a certain point, holding it closed has diminished returns. On a turbo especially(because of back pressure), opening it earlier helps higher rpm cylinder fill. Opening early gives the piston more time to evacuate the cylinder for a fresh charge. The important part of a turbo kit lies here. Pushing the EVO(exh valve opening) forward can raise back pressure. Opening earlier puts the opening point of the valve closer to the combustion event. So EGTs are higher. So when it opens earlier, that same comustion has more volume to it. Your exh and more importantly turbine, needs to be able to process more volume.</p><p></p><p>A valve opening sooner or later is assuming the lobe center line is the same. Like mentioned, because of variable cam timing, it may be possible to keep valve events close enough to stock if the cams are small enough.</p></blockquote><p></p>
[QUOTE="CPRsm, post: 13804661, member: 81705"] Eric beat me to my long winded post. Posting while watching cartoons with kids makes simple things take too long lol Idk the cam specs on those. But as a generalization you're going to give up low and midrange for top end. If the cams are small enough to maintain a good intake closing event, you could gain top end without losing it down low. The duration is a big reason for losing power down low. The longer the duration the earlier the valves open, and later they close. An intake valve actually closes after bottom dead center and is heading to TDC. Closing the intake earlys give the piston more time to make compression. It also can cause detonation. Exhaust valve can cause a power lose as well. Long duration makes the valve open early. Holding the exh valve longer give the combustion process a longer amount of time to push on the piston to create torque. After a certain point, holding it closed has diminished returns. On a turbo especially(because of back pressure), opening it earlier helps higher rpm cylinder fill. Opening early gives the piston more time to evacuate the cylinder for a fresh charge. The important part of a turbo kit lies here. Pushing the EVO(exh valve opening) forward can raise back pressure. Opening earlier puts the opening point of the valve closer to the combustion event. So EGTs are higher. So when it opens earlier, that same comustion has more volume to it. Your exh and more importantly turbine, needs to be able to process more volume. A valve opening sooner or later is assuming the lobe center line is the same. Like mentioned, because of variable cam timing, it may be possible to keep valve events close enough to stock if the cams are small enough. [/QUOTE]
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