Turbo problem
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Turbo problem
Originally Posted by SBV45
Notice the downpipe is 3.5". This engine needs back pressure for the PCM to properly control the variable vanes in the turbo.
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Joined: May 2004
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From: Clairmont Alberta Canada
yes this is normal i install lots of exhaust on trucks after hours the ebp changes and pcm just operates like this no actual drivability concerns with it all my customers complained at my work about this issue my boss kind of disliked the fact i installed this when i work at a ford dealer but o well
Postmaster
Joined: Aug 2003
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From: Central Texas
forddr, what you are saying is that the turbo surging is "normal" after putting on larger diameter exhaust? Or should you say that the surging is an expected effect of putting on a larger exhaust?
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Joined: Aug 2003
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From: Central Texas
Thanks Ford DR, I have been saying this for a while now on this site. I read both the 6.0 Bible and the Ford Service Manual on Powertrain Control and Emissions Diagnosis (PC/ED) section and came to that conclusion.
Mountain Pass
Joined: Oct 2004
Posts: 186
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From: New Mexico
OK, so how much of a gain did you get with the 4" exhaust? Would there still be a problem if the cat back system was installed? Is there much of a difference with either the turbo back or cat back for an '05? I was planning on a turbo back but now am questioning this. If the PCM needs to see a back pressure to run the turbo correctly, did Ford open up and smooth out the exhaust enough that there is less of a need than before to mess with it? Ponderous.
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Joined: May 2004
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From: Clairmont Alberta Canada
will still work fine all my customers ahve turbo back systems largest gain they notices reduced turbo lag on bottom end and better mpg 2-4 mpg increase
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From: Hamburg, IL
Ben, its not the exhaust. I have 4inch exhaust on mine with no cat or muffler and don't have that problem like you do. Mine did it to me once where it sounded like the turbo shut off mocking a cummings. Its the solenoid or the VGT sensor on the turbo acting up I was told
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