Map sensor?
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Post Fiend
Joined: Apr 2007
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From: Powder Springs, East TN
Map sensor?
Hey Guys
I was wondering about the MAP sensor if it is just there to regulate and defuel when you push too much boost or does it actually go into the fueling of the PCM. The reason I ask is if a DIY set up was set below 22 PSI would it actually cause any issues?
I was wondering about the MAP sensor if it is just there to regulate and defuel when you push too much boost or does it actually go into the fueling of the PCM. The reason I ask is if a DIY set up was set below 22 PSI would it actually cause any issues?
Posting Guru
Joined: Feb 2009
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From: Blaine, TN
To the best of my knowledge, yes it is used to calculate fueling. The only thing that I could see being an issue if it was set below 22 psi would be that you wouldnt get the most out of your tuning/fueling for any boost pressure above whatever you have the boost fooler set at. I would do my best to set it as close to 22 as I could Justin. Just my .02, anyone correct me if i'm wrong
Postmaster
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i tink Cale at BTS set mine at 19 psi the overboost regulator. i think 22 might be tad to much and might still pop SES ...
and yes if map sends signal of overboost to pcm will defuel.... the reason why they dont override sensor below that is cause it must play a role in fueling your truck.
im no expert in it maybe somone will have better info.
and yes if map sends signal of overboost to pcm will defuel.... the reason why they dont override sensor below that is cause it must play a role in fueling your truck.
im no expert in it maybe somone will have better info.
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Post Fiend
Joined: Apr 2007
Posts: 7,241
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From: Powder Springs, East TN
I have it set at 22 PSI from my compresser but I was wondering if it got moved around by say working in the engine or so and you didn't know it. I have been asked this question a few times so I figured I'd get it awnsered.
Posting Guru
Joined: Feb 2009
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From: Blaine, TN
If you are worried about it moving, take a paint stick marker or like a silver sharpie or something, i've got some paint stick markers in my truck from work if you need one when I see you here soon, just take it and mark a line straight down the side after you set it, the same they do when they torque bolts, that way at an easy glance you can see if it's moved or not.
Post Fiend
Joined: Mar 2007
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From: Texas
Have you considered putting it back on the compressor and using a paint pen to draw a line to mark the 22 psi setting? Or maybe getting the locking type regulator that you can't accidentally bump out of setting?
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Postmaster
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From: Fulltime RVer
I've never gotten a straight answer to the following two questions, and believe me I've ask people who must know the correct answers...
1) Why can't the 22 psi defuel threshold be changed or completely eliminated by modifying the PCM?
2) When you use a boost fooler or pressure regulator or zener diode or whatever way to deny the PCM what the true boost is how do you fuel efficiently at higher BP's? The AFR depends on BP and if the PCM doesn't know the actual BP when it's higher than 22 psi you can't fuel to a given AFR.
1) Why can't the 22 psi defuel threshold be changed or completely eliminated by modifying the PCM?
2) When you use a boost fooler or pressure regulator or zener diode or whatever way to deny the PCM what the true boost is how do you fuel efficiently at higher BP's? The AFR depends on BP and if the PCM doesn't know the actual BP when it's higher than 22 psi you can't fuel to a given AFR.
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Post Fiend
Joined: Mar 2007
Posts: 26,966
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From: Texas
I've never gotten a straight answer to the following two questions, and believe me I've ask people who must know the correct answers...
1) Why can't the 22 psi defuel threshold be changed or completely eliminated by modifying the PCM?
2) When you use a boost fooler or pressure regulator or zener diode or whatever way to deny the PCM what the true boost is how do you fuel efficiently at higher BP's? The AFR depends on BP and if the PCM doesn't know the actual BP when it's higher than 22 psi you can't fuel to a given AFR.
1) Why can't the 22 psi defuel threshold be changed or completely eliminated by modifying the PCM?
2) When you use a boost fooler or pressure regulator or zener diode or whatever way to deny the PCM what the true boost is how do you fuel efficiently at higher BP's? The AFR depends on BP and if the PCM doesn't know the actual BP when it's higher than 22 psi you can't fuel to a given AFR.
I'm surprised you haven't been able to get a better answer. I'll try and remember to ask Tony next time I see him to see if he has any comment on this.
can say who in the open forum... dont know if this person wanted me to say 
.
Posting Guru
Joined: Feb 2009
Posts: 1,325
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From: Blaine, TN
I've never gotten a straight answer to the following two questions, and believe me I've ask people who must know the correct answers...
1) Why can't the 22 psi defuel threshold be changed or completely eliminated by modifying the PCM?
2) When you use a boost fooler or pressure regulator or zener diode or whatever way to deny the PCM what the true boost is how do you fuel efficiently at higher BP's? The AFR depends on BP and if the PCM doesn't know the actual BP when it's higher than 22 psi you can't fuel to a given AFR.
1) Why can't the 22 psi defuel threshold be changed or completely eliminated by modifying the PCM?
2) When you use a boost fooler or pressure regulator or zener diode or whatever way to deny the PCM what the true boost is how do you fuel efficiently at higher BP's? The AFR depends on BP and if the PCM doesn't know the actual BP when it's higher than 22 psi you can't fuel to a given AFR.
#2--If you use a pressure regulator type fooler the MAP sensor is actually ready true psi up to the 22psi mark( or whatever you have it set at) Above that it is still ready 22psi, and you are correct, it will affect the AFR if you do not have a chip, or have a chip set on the stock setting
Now to part 2 of #2--I'm making an educated guess here, and someone please correct me if i'm wrong
I believe with tuning anything above the boost fooler limit- is a calculated AFR that they have burned into the chip based on what mods you have done to your truck. That is if you have custom tuning(the same reason you get more out of a custom chip compared to something like an edge or something like that).
I hope this may answer your question man, and answer it correctly too, but like I said anyone please correct me if i'm wrong, i'm always willing to learn
Posting Guru
Joined: Feb 2009
Posts: 1,325
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From: Blaine, TN
BP-boost pressure
AFR--air fuel ratio(A/F also)
lol I had to think for a minute too when I first read it dont feel bad
AFR--air fuel ratio(A/F also)
lol I had to think for a minute too when I first read it dont feel bad
Postmaster
Joined: Oct 2005
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From: Northeast TN
Thanks Corey. Are your ears burning? I'm on the phone with JD right now. He said your a good man.
Posting Guru
Joined: Feb 2009
Posts: 1,325
Likes: 4
From: Blaine, TN
