11 psi boost
Thread Starter
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Senior User
Joined: Mar 2005
Posts: 103
Likes: 0
From: SE MN
well i just got done with a test drive after i put a new autometer boost gauge in and it was reading 21psi of boost on my stock setting! my edge was reading 11. It must not be reading right, i belive the autometer now. Also thanks to everyone who was trying to help me.
Senior User
Joined: Mar 2007
Posts: 473
Likes: 3
From: Issaquah, WA
The edge tuner reads the PCM signal right off the comm bus. It is what the PCM is being told the pressure is. While the mechanical gage may well be correct, I'd be suspicious of your MAP sensor providing false readings. If the MAP reading is off, it is going to create other problems in the fueling tables. I'd start by checking the hose to the map sensor for cracks or leaks.
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Senior User
Joined: Mar 2005
Posts: 103
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From: SE MN
I tied it into the map sensor line i think it is the one that goes from the intake over by the oil filler cap and it plugs into a electrical thing on the passenger side of the truck.
Post Fiend
Joined: Feb 2007
Posts: 14,541
Likes: 2
From: Dallas-Ft. Worth
That's correct. If you don't have a boosht fooler, your MAP sensor is bad. Mine was reading very low until I adjusted my fooler regulator. Now it reads correct up to 21psi. 
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Thread Starter
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Senior User
Joined: Mar 2005
Posts: 103
Likes: 0
From: SE MN
i dont know what your talking about, fooler regulator? are you saying i need to replace my map sensor? could this hurt my 7.3? on the tow setting it is reading around 25 psi on the autometer and still 11 psi on the edge.
Post Fiend
Joined: Feb 2007
Posts: 14,541
Likes: 2
From: Dallas-Ft. Worth
It's possible it's hurting economy or power. If the PCM thinks you're only getting 11psi, it might not fuel normally. It won't HURT the engine as in break something.
Boost fooler is for when you have a chip that can make over 25psi. With the stock setup, the PCM sets a code around 22psi and will defuel the engine at 25. I can get to 30 now since the PCM is held to seeing 22 max. It's just an air pressure regulator put inline with the MAP line. You put the gauge tee before it (or in the spider) so the gauge sees the real pressure.
You can see it in this pic on the far left side. Notice I have an AIH delete plug tapped for a fitting for the boost reading:
EDIT: Here is where I got mine:
http://www.itpdiesel.com/store.php/products/Overboost
Boost fooler is for when you have a chip that can make over 25psi. With the stock setup, the PCM sets a code around 22psi and will defuel the engine at 25. I can get to 30 now since the PCM is held to seeing 22 max. It's just an air pressure regulator put inline with the MAP line. You put the gauge tee before it (or in the spider) so the gauge sees the real pressure.
You can see it in this pic on the far left side. Notice I have an AIH delete plug tapped for a fitting for the boost reading:
EDIT: Here is where I got mine:
http://www.itpdiesel.com/store.php/products/Overboost
