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Old 12-01-2009, 04:47 PM
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How much boost?

How much boost can I get out of my truck before the PCM thinks it's too much and starts defueling. I'm hitting about 20 to 21 now. Also whats the best way to do a boost fooler? DIY or is there a cheap one I could buy? Thanks guys, trying to learn here!
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Old 12-01-2009, 04:58 PM
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..the search button is your best friend..this subjects been hit about 1000000 times..

my old truck hit 25 and she would de-fuel.. and the boost fooler just DYI just try that ole search button out!
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Old 12-02-2009, 03:14 AM
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stock they start defueling around 15psi
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Old 12-02-2009, 05:04 AM
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Quote:
Originally Posted by 85_305 View Post
stock they start defueling around 15psi
..mine hits 18 stock just fine..and runs like a champ...
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Old 12-02-2009, 04:46 PM
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There is no defuel on the Super Duty trucks regardless of boost amount. There is an overboost code that reduces the cycle time of the IPR. The result is a slower gain in acceleration, not a reduction of fuel. The way to see if you are setting this would be to scan for the code. This is off the top of my head and it may be wrong, but I think it is a P0236 that is the code. You can set them on 94-97's, but it is a higher differential than the 99-03's. I run a MAP Pressure Relief Valve on my 95.

However, I've seen various configurations of MAP sensor alterations and I would warn that most are ill conceived. The majority of the pressure relief set ups I've seen blow off actual boost and do not isolate excess boost to the MAP side only, leaving the manifold pressure able to rise. The electric modifications don't allow MDFR (Mass Desired Fuel Rate) on the low end early enough since they mitigate the overall boost by a percentage.

That said Boost fooler needed with a chip.
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Old 12-02-2009, 04:51 PM
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Quote:
Originally Posted by caryt View Post
There is no defuel on the Super Duty trucks regardless of boost amount. There is an overboost code that reduces the cycle time of the IPR. The result is a slower gain in acceleration, not a reduction of fuel. The way to see if you are setting this would be to scan for the code. This is off the top of my head and it may be wrong, but I think it is a P0236 that is the code. You can set them on 94-97's, but it is a higher differential than the 99-03's. I run a MAP Pressure Relief Valve on my 95.

However, I've seen various configurations of MAP sensor alterations and I would warn that most are ill conceived. The majority of the pressure relief set ups I've seen blow off actual boost and do not isolate excess boost to the MAP side only, leaving the manifold pressure able to rise. The electric modifications don't allow MDFR (Mass Desired Fuel Rate) on the low end early enough since they mitigate the overall boost by a percentage.

That said Boost fooler needed with a chip.
Exactly I have since ditched my 4.7v doide for an ITP overboost annihiliator and I prefer it, I have it set at around 24 lbs, when i got it i bench tested it and it is a pressure regulator, you put 50 lbs on the hot side, and it reads a steady 24 on the discharge side!
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