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Power Strokes
6.4 Aftermarket
Exhaust Back Pressure
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[QUOTE="White_monster, post: 82496, member: 594"] well it seems you have cylinder pressure and exhaust pressure confused. Studs are what contain the higher than stock cylinder pressures. Exhaust pressure is the pressurized air(exhaust) between the exhaust side of the turbo and the exhaust valves in the head. The limit on exhaust pressure is when the valves are forced open by the pressure which I believe is around 66-68psi gauge or roughly 80-82psi atmospheric depending on altitude. How atmospheric pressure is connected to all this is hard for me to word correctly so I'll let someone else deal with that. So to answer your above questions here we go. 1. Stock bolts are 60,000psi tensile strength, so that's when they start to stretch. 2. No idea what ebp is on stock as I never even thought to look but I'll see if I can convince the dealer to let me try it. 3. Elite studs are good to 240,000psi tensile strength and there has yet to be a failed set of these stud but there has been some failed gaskets due to nitrous related incidents and various other scenarios. 4. Bigger turbos drop or raise the ebp depending on the exhaust housing side of the turbos. Another thing that controls the ebp is a wastegate. 5. Cures are a wastegate. Nothing else really is able to regulate the pressure and has a set point to open at when pressures start to get to high. Stronger valve springs are an addition that can be made to allow the system to maintain higher pressures but again the higher pressure is controlled by the wastegate. The thing the stiffer valve springs do is keep the valves from floating(staying open) when the boost or exhaust pressure is bumped up. 6. Like I said I have trouble putting into words how atmospheric pressure comes into play. I know how it does but explaining it isn't so easy. Hope this helps and if anyone knows I'm wrong please feel free to correct me. Were all here to learn and pass on information. [/QUOTE]
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