OBA Question?
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Laughing Gas
Joined: Jan 2009
Posts: 911
Likes: 74
From: Montana
OBA Question?
I installed an OBA on my 99. Before the OBA i could see 21-22 psi! After on my "EDGE" display i only get 14-15 psi. Is my "EDGE" reading what is going to the map sensor? If i had a manual boost gauge would i see the samething or the hopefully higher but correct boost? THnaks
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
Is the Edge tied into a wire going to the MAP sensor? My guess is yes, so the Edge is only going to read whatever your OBA lets it see. A real boost gauge with a probe will give you an accurate reading.
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Joined: Feb 2009
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I installed an OBA on my 99. Before the OBA i could see 21-22 psi! After on my "EDGE" display i only get 14-15 psi. Is my "EDGE" reading what is going to the map sensor? If i had a manual boost gauge would i see the samething or the hopefully higher but correct boost? THnaks
Hotshot
Joined: Jan 2008
Posts: 13,144
Likes: 11
From: Rochdale MA
You should see what you were seeing before 20-22 psi maybe more if you didn't have the edge. The Edge does a good job of reading the boost from your map sensor. IF you are limiting the pressure,boost, that the map sees then the edge will only read that.
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Laughing Gas
Joined: Jan 2009
Posts: 911
Likes: 74
From: Montana
Jim i meant to ask if i would see more boost total with the OBA? Not what the edge is showing.
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Post Fiend
Joined: Feb 2007
Posts: 14,541
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From: Dallas-Ft. Worth
All the OBA does is hide the real boost from the PCM so it doesn't defuel the engine and set the CEL. The only way it would help with making more boost if is you had the fuel & turbo to make it in the first place, then yes, it would help. Otherwise all it does is keep the PCM dumb & happy. LOL
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Lead Driver
Joined: Jun 2003
Posts: 8,298
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From: Damon (South East Texas)
22-23 psi would be best. Just below the defuel point. I have mine set at 23 psi and it doesn't defuel or set the SES light.
Lead Driver
Joined: Jun 2003
Posts: 8,298
Likes: 25
From: Damon (South East Texas)
If you do go with a boost gauge, most people are using the AIH delete plug with boost port on the intake spider. You can get this from Riffraff Performance. you don't have to worry about the line going to the MAP sensor when using this. You can monitor both the actual boost and the OBA "set" point.
Fleet Mechanic
Joined: Jul 2003
Posts: 1,815
Likes: 24
From: Houston
I read through half this thread trying to figure out what On Board Air had to do with a boost gauge and why on earth you would hook a boost gauge to it. Funny thing is I have an OverBoost Anhilator. It's one of those days.
Hotshot
Joined: Jul 2003
Posts: 12,177
Likes: 40
From: Newport, WA
Not laughing at you, but with you! 
IIRC at anything above 20psi and the computer is feeding all the fuel it can to the injectors. Set your OBA to 22 PSI and you'll get all the fuel you can get w/o the SES light from overboost.