Boost is limited, Engine defueling

[larz18]

When i punch the gas my boost spikes within seconds to 17psi and stays there as long as i keep my foot into it. The truck will shift through all gears and stay at the 17psi. it will only go above the 17psi if im in 4th gear and at highway speeds (above 70mph) then it will slowly climb up to reach a max of around 23 psi. It will only go this high when the chip is on. If the chip is off it will stay at the max. 17psi. Is this a thing with the programming of the computer to where it reaches the peak boost and defuels the motor. Any ideas on how to get the max boost output and keep the motor from defueling. it just seems like there is so much more power availalbe and it stops at 17psi. Thanks in adavance

[mschn99]

easy fix, you need a map sensor fooler, call our vendors, i know Dfuser makes one. This will keep the SES light off and keep the motor from defuling

[larz18]

well that is what i thought also but i wasnt sure. It sounded like the MAP sensor fooler would only remove the overboost light from comming on and im not having that problem becuase i can even get to 25psi. Wouldnt removing the boost line to the MAP sensor test that theory and alow the motor to get max boost? I tried that to and it didn't work. So are you think the actual wiring harness that plugs into the MAP sensor or a relief valve?

[mschn99]

from what ive heard, the one that plugs into the wiring harness is the way to go, but hopefully someone else will chime in here on that....

[Mike OB]

You need to answer some questions first, where are you reading the boost at, what are you using to read the boost? Are you connected to the intake with a pressure gauge or do you have a six gun or a monitor like that which is giving you this reading? Mike OB

[larz18]

I am getting my boost reading on the line that goes directly to the MAP sensor. I have a Tee in that line that splitls the line and goes directly to a autometer boost gauge. i do not have a six gun tuner or edge module that give me a reading.
thanks

[mschn99]

have you checked to see if maybe one of the compression fittings that seal the line have failed....and are just giving you inacurate readings,

[chancelor]

I have a dfuser and if you are interested Ill send it to you as long as yours is compatable I think I paid 175 Ill sell it for 80 I bought the edge so its just laying here now!

[larz18]

what dfuser model do you have? If it was for your '06 6.0L than i will bet that it will not work for my '99 7.3L

[larz18]

I have checked all my fittings and hoses for leaks and the proper connections. I don't think that is the problem. I feel like i get great readings its just the boost will spike to 17psi when i floor it in a matter of a second. It sounds like that wire harness is the way 2 go for the MAP sensor, i just want to make sure that it will eliminate the defueling of the engine also