Exhaust back pressure limit before studs - Ford Powerstroke Diesel Forum
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Old 03-25-2013, 12:23 PM
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Exhaust back pressure limit before studs

Hey guys, got a quick question.
I currently run the HD300 tune on my truck. As we all know exhaust back pressure kills head gaskets. Im running my low boost fuel setting at 3. Stock valve train And stock internal parts. What is the most I want to be seeing of exhaust back pressure read off a mini maxx. I know barometric pressure plays along in the equation, but what the programmer reads, what's the safest. I am currently seeing only 65psi of exhaust back pressure that my mini maxx is telling me.


Later on I'm doing studs and valvetrain with the cab on and am going to make a thread of how to do it. I just want to know about the ebp.
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Old 03-25-2013, 01:48 PM
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The Minimaxx sees gauged pressure. Which means you dont have to subtract any numbers (barometric pressure) from it. It is nice to not go over 70psi on the minimax as it may push the exhaust valves back open at some point after that. Cylinder Pressure has the most effect on headgaskets.
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Old 03-25-2013, 07:29 PM
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Is there anyway of measuring cylinder pressure? I heard this for this forum, that's why I ask. I know 70 is the top of the top before the valves start floating. When doing studs what can I do to lower back pressure, besides put a wastegate
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Old 03-26-2013, 06:30 AM
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I would say the best way to lower back pressure would be to get rid of the restriction on the exhaust side. I eventually plan to do 6.0 exhaust manifolds (or RCD manifolds, or MPD manifolds) and custom up pipes. This should help the back pressure.
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