Absolute pressure compensation

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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...


« Last Edit: July 11, 2014, 12:44:03 PM by turdburglar44 »	Logged

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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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