MDP questions? ?
Can the MDP sensor be used to monitor vacuum conditions?
I ask this because I cannot get a vacuum reading. Boost (MDP) in EvoScan reads in the 50s at idle which I know is incorrect because of the vacuum condition at idle. I assume most of you will tell me to get the JDM MAP sensor and be done with it. |
Originally Posted by Appauldd
(Post 6595236)
Can the MDP sensor be used to monitor vacuum conditions?
I ask this because I cannot get a vacuum reading. Boost (MDP) in EvoScan reads in the 50s at idle which I know is incorrect because of the vacuum condition at idle. I assume most of you will tell me to get the JDM MAP sensor and be done with it. would be great is there was a two way pressure sensor heh.... correct me if i'm wrong please. EDIT: please do tell me there is vacume resolution on the JDM 3bar and i'm wrong. if so, i'm buying one right now. |
^MAP sensors measure absolute pressure. From -14.7 and up. Meaning vacuum is seen as pressure by them. So yes there is vacuum resolution, if that's what you're asking about JDM MAP...
OP, stock MDP is a 1 bar, meaning it should show vacuum values.. Maybe Evoscan calculation/address is wrong? |
Originally Posted by mplspilot
(Post 6596152)
^MAP sensors measure absolute pressure. From -14.7 and up. Meaning vacuum is seen as pressure by them. So yes there is vacuum resolution, if that's what you're asking about JDM MAP...
OP, stock MDP is a 1 bar, meaning it should show vacuum values.. Maybe Evoscan calculation/address is wrong? what should the EvoScan calc be??? |
Originally Posted by mplspilot
(Post 6596152)
^MAP sensors measure absolute pressure. From -14.7 and up. Meaning vacuum is seen as pressure by them. So yes there is vacuum resolution, if that's what you're asking about JDM MAP...
OP, stock MDP is a 1 bar, meaning it should show vacuum values.. Maybe Evoscan calculation/address is wrong? to OP, i get your same issue when logging the MAP with evoscan--i gave up a while ago lol. i'll check this out in detail again tonight. thanks |
atmo isn't 0v on the MAP sensor, its like 1.6v.
so anything under 1.6v is considered vacuum. I dont know what formula to convert -psi into hg/mm (orwhatever vacuum is measured in) |
Originally Posted by tephra
(Post 6596755)
atmo isn't 0v on the MAP sensor, its like 1.6v.
so anything under 1.6v is considered vacuum. I dont know what formula to convert -psi into hg/mm (orwhatever vacuum is measured in) i have the crappy usdm MAP. it's a hair under 4v or so it says lol. i tried manipulting the cal tables a while ago to the usdm linear curve, but i still couldn't get proper vacume tunability [with bez's code]. i'll try again as maybe i gave up too quick lol. |
Originally Posted by tephra
(Post 6596755)
I dont know what formula to convert -psi into hg/mm (orwhatever vacuum is measured in)
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My question still remains......what should the proper calculation be set as in EvoScan for reading the MDP???
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depends on the MDP. what one is it?
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Originally Posted by tephra
(Post 6597986)
depends on the MDP. what one is it?
Stock The reason for my request is because I am working on the MAP to MAF patch. I have my car running pretty well but I cannot get accurate with VE if I don't have accurate vacuum. |
what the 1bar version?
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Originally Posted by tephra
(Post 6598022)
what the 1bar version?
I am also running the 94170015 with your 5.10 mods. You really are the man!{thumbup} |
hrmm not sure what the scaling for the 1bar map sensor is. actually isn't it in evoscan already?
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Thats the problem. I cannot get a vacuum reading. The Boost(MDP) setting in EvoScan never goes negative. At idle it hovers in the 30s.
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