How to trick the MAP sensor

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Jul 17, 2005 | 02:06 PM

wayfastwhitey

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How to trick the MAP sensor

I was reading on this forum and read that the 7.3 gets the full fuel loop at 17 psi of boost, and any more boost and it de-fuels, if this is true and I am running 25 psi on full throttle can I make my own MAP tricker? I know that you can buy one but will a homemade boost controller for a gas motor work? I have one that is simply constructed out of a swivel cut-off ball valve with hose barbs on each side. Could I construct one that would only allow 17 psi through it? would this even be worth it? would I gain HP or Torque or what with full fuel past 17 psi? or would the tricker have to be more complicated than a ball valve?
Just thinking
Brad

Jul 17, 2005 | 02:08 PM

wayfastwhitey

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If it is easier to just buy one premade where do I get one?

Jul 17, 2005 | 02:30 PM

touchofgrey

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Quote:

Originally Posted by wayfastwhitey

Actually the PCM starts to defuel around 24 - 25 psi....not 17. Check with Diesel Inovations, Diesel Performance, or Black Cloud for a fix to go higher.

Jul 17, 2005 | 02:34 PM

wlihntr

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From: colorado

scroll down a little on this link, this is one of our sponsors:
http://www.blackclouddiesel.com/Ford...tuff.htm#Valve

Jul 17, 2005 | 09:01 PM

wayfastwhitey

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thanks for the help guys!! there are soooo many diesel performance web sites now that I looked through about 21 and didnt find anything near like what I was looking for and got fed up.
Brad

Jul 18, 2005 | 02:57 PM

Hello

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Quote:

Originally Posted by wayfastwhitey

At 17 psi of boost the computer is at 100% of it's fuel map. So it is delivering all the fuel that the stock injectors can produce. You do not need a valve that blows off at a higher number than 20 lbs. Now if you got a tuner, it will still deliver the max at 17psi, but at a higher pressure. Then you will develop even more boost if you can supply more air. Otherwise you get a lot of smoke. If you construct one just set it at 20 psi.
If you make one from a regulator it may be slow to repond to the MAP sensor so you will not get enough fuel at the exact moment you need it since it takes time to catch up. So you can have the boost up to 20 psi, and the MAP sensor only sees 10 psi and rising. You get less fuel then. A BRV may be the best because it is accurate.

Last edited by Hello; Jul 18, 2005 at 03:25 PM.

Jul 18, 2005 | 08:57 PM

wayfastwhitey

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Whats a BRV? I am planning on getting the dual valve on efrom blackcoud, along a bunch of other goodies he has :-) will this dual BOV from BCD create the same slow MAP reaction like stated above?