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Exhaust backpressure data

 
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Old 12-19-2014, 07:50 PM
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Exhaust backpressure data

I was just wondering for those who log data what is the max pressure I should see while driving and at WOT. I can push 49-50 psi at WOT is that too much and if so what would cause it to be that high. Should I be concerned?
 
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Old 12-19-2014, 08:18 PM
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I think the sensor limit is somewhere in the 50psi range, 58 iirc. If you subtract 14.7psi atmospheric pressure, your at 34psig back pressure. What is your max boost at? When cruising, my ebp and map are within a pound or 2 of each other.
 
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Old 12-20-2014, 11:29 AM
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Out of all the data I've seen, 53 PSI absolute backpressure is about the limit of the sensor. With that reading, you need to do as The Brad suggests and subtract the air pressure of your altitude (in PSI) to get your gauge backpressure. It sounds like you are about 3 PSI from maxing the sensor (and the engine) out. I wouldn't want to exceed 40 PSI gauge backpressure on valve springs with a lot of miles. To that end, I set my wastegate to let go right at that 53 PSI absolute.

Another question is... what does your MAP say at that backpressure? Many stock turbos give up about 27 - 30 PSI boost at 39 - 40 PSI gauge backpressure, where my 38R is about even all the way up the dial.
 
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Old 12-20-2014, 04:14 PM
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Ok I will get some more info and report back I don't think anything is wrong just trying to understand what I am looking at when I see these values so if something is wrong I can spot it and know where to look. Using DashCommand so there won't be any IPR % or Fuel pulse which sucks because those are some very important numbers.
 
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Old 12-20-2014, 09:20 PM
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I'm guessing you have iOS. I have iOS, Android, and about 3 versions of Windows I work with on a daily basis. I'm really starting to appreciate Android... I just wish my Nexus 7 2013 would grab Lollipop and load it up. Every web search says I'm supposed to be able to get it by now.
 
 
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