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Title: Absolute pressure compensation Post by: turdburglar44 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. Title: Re: Absolute pressure compensation Post by: elRey on July 11, 2014, 12:36:20 PM what requested boost do you see in your logs? 8 or 10?
Title: Re: Absolute pressure compensation Post by: turdburglar44 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...
Title: Re: Post by: turdburglar44 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?
Title: Re: Absolute pressure compensation Post by: jibberjive 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.
Title: Re: Post by: turdburglar44 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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