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Title: Higher pressure MAP sensors - how to scale? Post by: julex on October 29, 2010, 08:31:26 PM Is it possible to change some constant value/map that would tell ECU to properly scale and show higher pressure MAP sensor?
For example, I would like to use Zeitronix 3.5 bar (50psi) absolute pressure sensor which outputs 0.5v atmospheric, 4.5v 50psi (3.5bar) absolute pressure in place of factory MAP sensor. As is, I would be showing underscaled values but would love to be able to read true boost value when accessing VAG blocks. Any ideas? Title: Re: Higher pressure MAP sensors - how to scale? Post by: Rick on October 30, 2010, 02:41:23 AM No, i'm afraid it isn't possible without a complete rewrite of the code.
Rick Title: Re: Higher pressure MAP sensors - how to scale? Post by: hammersword on October 30, 2010, 06:27:34 PM yes you can!
but you have to know some maps to scale it correct! I have install 3bar MAP in my Abarth and stock was 2.55bar Title: Re: Higher pressure MAP sensors - how to scale? Post by: julex on October 31, 2010, 03:10:54 PM any idea which maps are these?
Title: Re: Higher pressure MAP sensors - how to scale? Post by: phila_dot on October 31, 2010, 10:39:10 PM More information on this in the thread below. Basically expounding on what Rick said.
http://www.nefariousmotorsports.com/forum/index.php?topic=110.0title= Title: Re: Higher pressure MAP sensors - how to scale? Post by: Tony@NefMoto on November 12, 2010, 03:17:11 PM You can rescale the MAP sensor scale for converting from voltage to pressure, but you can't make the ECU read more than 2550mbar.
Title: Re: Higher pressure MAP sensors - how to scale? Post by: nyet on January 18, 2011, 01:51:15 PM I think this is doable... just let the ECU read low, as I pointed out in the other thread linked above. It works (mostly) for unscaled MAFs, and load is all over the place in ME7! I can't imagine there are that many places that care if the MAP reading is off (perhaps ambient needs to be close?)
Does anybody have direct experience as to what parts of ME7 (other than the PID and PR limits) really care what the actual MAP value is? Title: Re: Higher pressure MAP sensors - how to scale? Post by: nyet on April 21, 2011, 12:43:32 AM http://www.nefariousmotorsports.com/forum/index.php/topic,531.msg4243.html#msg4243
Title: Re: Higher pressure MAP sensors - how to scale? Post by: Tony@NefMoto on April 21, 2011, 01:10:21 PM Does anybody have direct experience as to what parts of ME7 (other than the PID and PR limits) really care what the actual MAP value is? During my disassembly of the ECU code, it appeared as though the only systems that used the air pressure values were the boost pressure regulation/diagnostic system, and the system for predicting load changes based on intake manifold pressure. Running an underscaled MAP may be fine for the boost pressure regulation system, but it may screw up the model that the ME7 uses to achieve target load. There are a few maps that are used to do conversions from intake pressure to cylinder filling pressure, and then the cylinder filling pressure is used to determine engine efficiency if I recall. Title: Re: Higher pressure MAP sensors - how to scale? Post by: AudiA4_20T on April 27, 2011, 02:09:41 PM Revo did this on a specific B6 A4 tune with a specific MAF/MAP/injector setup
Title: Re: Higher pressure MAP sensors - how to scale? Post by: julex on April 27, 2011, 03:49:10 PM Does anybody have direct experience as to what parts of ME7 (other than the PID and PR limits) really care what the actual MAP value is? During my disassembly of the ECU code, it appeared as though the only systems that used the air pressure values were the boost pressure regulation/diagnostic system, and the system for predicting load changes based on intake manifold pressure. Running an underscaled MAP may be fine for the boost pressure regulation system, but it may screw up the model that the ME7 uses to achieve target load. There are a few maps that are used to do conversions from intake pressure to cylinder filling pressure, and then the cylinder filling pressure is used to determine engine efficiency if I recall. It can't be that bad if you can run the engine strictly on KFLDRL map beyond MAP limit, apparently it doesn't care that much. I will most likely run underscaled MAP sensor sometime in the future to have ECU regulating my GT turbos instead of relying on hardcoded values in KFLDRL map... Title: Re: Higher pressure MAP sensors - how to scale? Post by: nyet on April 28, 2011, 12:47:02 AM I will most likely run underscaled MAP sensor sometime in the future to have ECU regulating my GT turbos instead of relying on hardcoded values in KFLDRL map... keep us updated! Title: Re: Higher pressure MAP sensors - how to scale? Post by: Escy on May 14, 2016, 01:38:22 AM Has anyone actually done this and is there any code for it?
I've got custom boost pipes on my 2.7t, i'm going to run a Zeitronix and will use their map sensor. It would be much easier if I didn't have to fit a standard map sensor into my pipework and could use the Zeitronix sensor for both. Title: Re: Higher pressure MAP sensors - how to scale? Post by: nyet on May 14, 2016, 10:18:38 AM Holy necro bump.
This thread is out of date, dude. http://nefariousmotorsports.com/forum/index.php?topic=3027.0title= |