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Topic: Absolute pressure compensation (Read 4085 times)
turdburglar44
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Absolute pressure compensation
« on: July 11, 2014, 12:29:18 PM »
So I have done a lot of reading and haven't quite found a definite answer to a few things; (and I haven't logged anything yet >.<)
LDRXN is targeting load based on absolute pressure correct? so the stock table with a peak around 8 psig (22.7psia @ sea level )should be giving me about 10.7psig at my altitude ( about 12 psia ) right? but instead I am seeing only 8 psi...
my only guess to why I'm not seeing 10.7 psig is either KFLDIMX is limiting my duty cycle or my pressure ratio is capped by KFLDHBN.
sorry for such a novice question but any guidance (even just a link) is appreciated.
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elRey
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Re: Absolute pressure compensation
« Reply #1 on: July 11, 2014, 12:36:20 PM »
what requested boost do you see in your logs? 8 or 10?
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turdburglar44
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Re: Absolute pressure compensation
« Reply #2 on: July 11, 2014, 12:40:02 PM »
I haven't done any logging yet. bored at work trying to wrap my head around the basic concepts and make a decent stg1 base map. When I bought the car it had a Cheapo boost gauge on it. that's the only reason I know boost pressure. gauge could have been inaccurate...
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Last Edit: July 11, 2014, 12:44:03 PM by turdburglar44
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turdburglar44
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Re:
« Reply #3 on: July 11, 2014, 01:40:27 PM »
I guess my question is am I understanding the use of these maps and their units correctly?
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jibberjive
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Re: Absolute pressure compensation
« Reply #4 on: July 14, 2014, 10:26:10 PM »
First thing to do is log. Also, keep in mind that you mechanical boost gauge was likely calibrated at sea level as well.
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turdburglar44
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Re:
« Reply #5 on: August 06, 2014, 01:19:29 PM »
After logging I have learned that yes the ecu does factor atmospheric pressure into load. It seems to me that it also factors in the compressor map somehow. Ie; 10psi @3k rpm is much lower load than 10psi @6krpm. Does kfldhbn limit boost in me7.5? My findings would point towards 'yes it does.' (I have since found and sorted out mechanical issues with my boost control)
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