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Power Strokes
6.4 Aftermarket
Cylinder heads: Ported vs Stock?
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[QUOTE="White_monster, post: 120503, member: 594"] Well the heads do help yes but what brought the egt's down? Well the stock turbos are beyond there thermal efficiency range. What does that mean? Well it means the turbos are not able to produce more boost efficiently. At a certain point the turbos only heat the air up and yes you get more boost but the airs so hot you can't use it affectively. So with stepping up to bigger turbos the compressor map changes and allows for a greater volume of air to move thru the turbo for the same boost pressure as was used on the stock turbos but the air temp after the turbo is at a useable temp. So now with upgraded turbos your moving more air into the engine and are able to inject more fuel than stock cause you have the extra air needed to clean it up. Spool up has to do with the exhaust side of things. Sure you need the exhaust ports of the head if you open the intake side up but ultimately the exhaust housing of the turbo is the reason for a spool up. If you set your gate really loose spool is affected greatly. This subject has an insane amount of variables and information for us to cover. [/QUOTE]
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Cylinder heads: Ported vs Stock?
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