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The next big mod?

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Old Nov 29, 2007 | 04:34 PM
  #1  
parkland's Avatar
parkland
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Talking The next big mod?

OK guys, i know everyone knows about the 10k mod, as i have.
Blah blah blah, tricks computer, blah blah, more fuel blah.

Now, looking under the hood, "hanging" near the AC hoses going into the cab, on the passenger side, theres a little black box, with a hose that goes to the manifold. This is where my boosts guage is tapped.

Undoubtedly this is a MAP sensor, or equivelent. This is the little ******* that tells the computer how much boost there is.

My question is, could you put a resistor there instead of the sensor, so the computer always see's, say 24LB of boost?

Even if you hit 30psi, the computer would never see it!

If you mashed the pedal, the truck would over-fuel, just like a chip, and make some serious take off power...

This little sensor couldnt be to complex, theres only 3 wires!!!

Anyone ever heard of this?

A 10k mod and this, would be awesome for 1$ of parts...
 
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Old Nov 29, 2007 | 04:47 PM
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Boost foolers don't know what it would require to make one but they sell them so yes you could make one.
 
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Old Nov 29, 2007 | 04:48 PM
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that is the map sensor..if it see any thing over 22 it will tell the pcm to start defueling..OBA lets the map see 22 and thats it..even if you fit 50.

http://www.itpdiesel.com/store.php?crn=102&rn=280&action=show_detail

if that is what you are seeing.. the pic below you can see the map sensor to the left..the OBA looks like a dial sitting on top of the map sensor and has 2 red hoses..one going to the spider other to the map sensor..whats good about this OBA is does not leak boost at all..it just hides it from the map sensor..
 

Last edited by ron's power stoke; Nov 29, 2007 at 04:52 PM.
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Old Nov 29, 2007 | 04:50 PM
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yep, overboost annihilator sold at ITP...$45


i think this particualr one makes the computer see 22 at all times i could be wrong about this number though




EDIT:ron snuck in there on me
 
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Old Nov 29, 2007 | 05:21 PM
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Originally Posted by parkland
....Undoubtedly this is a MAP sensor, or equivelent. This is the little ******* that tells the computer how much boost there is.
My question is, could you put a resistor there instead of the sensor, so the computer always see's, say 24LB of boost?
This little sensor couldnt be to complex, theres only 3 wires!!!
Anyone ever heard of this?
A 10k mod and this, would be awesome for 1$ of parts...
An electronic voltage clamp is certainly possible, but to get the accuracy needed over the large temperature swing would be difficult. there are several ways to do it; compensated zener clamp, op amp follower with a regulated supply...
The mechanical regulators most people used don't have that problem.
 
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Old Nov 29, 2007 | 05:29 PM
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they do have a eliminator to put in the map line..just don't hear a lot about it..
i think it has to do with with our tunes useing the map sensor..
http://www.dfuser.com/mfg/powerstroke/73/Engine/Sensors/Sensors.php

8th one down..MAP Sensor Maxmimizer
 

Last edited by ron's power stoke; Nov 29, 2007 at 05:33 PM.
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Old Nov 29, 2007 | 05:31 PM
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Originally Posted by nhill2090
yep, overboost annihilator sold at ITP...$45


i think this particualr one makes the computer see 22 at all times i could be wrong about this number though
Sort of. The OBA lets it see what is actually going on up to about 22 then shows the PCM no more boost than that, no matter what is really going on. This allows it to fuel properly for the boost at hand and prevents defueling when it gets high.
 
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Old Nov 29, 2007 | 05:33 PM
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