Lower boost after egr fix? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 6 (permalink) Old 01-17-2010, 01:51 PM Thread Starter
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Lower boost after egr fix?

So I just turned 100k on my 06 and decided to do some major preventative maintenance. I fixed the EGR "Liberator", studs, cleaned ebp tube and sensor, new oil rail plugs, rebuilt oil cooler, turbo boot, serpentine, 3.5 downpipe.

After all that I dropped down to about 20-22psi of boost from 30psi for the last 100k. Checked the boots and all is OK. I called liberator and they said it is not uncommon to see this depending on the programming. They said it is probably flowing more air since the new up pipe to the turbo does not have the scoop and it is more efficient now? The power is the same I think. The boost gets to 22-24 with an extreme tune in. Does this make sense to you guys?
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post #2 of 6 (permalink) Old 01-17-2010, 04:40 PM
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I can see it happening. Without the EGR there, the pcm is commanding the veins to be in a different position. This is probably what is causing your different boost numbers.

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post #3 of 6 (permalink) Old 01-17-2010, 05:04 PM Thread Starter
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Should I just run it? I plan on running my extreme street tune most of the time. I feel as though I am missing out on some power or efficiency with the lower boost.
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post #4 of 6 (permalink) Old 01-17-2010, 05:16 PM
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Your truck has a "Mass Air Meter" that the PCM uses to control fueling, so boost has little impact.

You cleaned the EBP tube, if it had been plugged or restricted, the PCM would not have known that desired EPB (turbo drive presssure) had been reached so it would not have adjusted the vanes to a more open position which in-turn would explain your previous higher boost pressure.

Boost is NOT what you want to see, but the actual amount of air entering the engine (Mass of air), you may actually be getting more air now than before but we can;t know for sure.

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post #5 of 6 (permalink) Old 01-17-2010, 05:21 PM Thread Starter
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I would not be surprised if it was pushing more air. The first time I installed the Extreme tune it blew off the drivers side intercooler tube for the first time and the smoke seamed less than before.
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post #6 of 6 (permalink) Old 01-17-2010, 05:31 PM
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Its the PCM sensing the EGR not working, people call this the EPA mode where it goes do different turbo positions and fueling to reduce emissions with the EGR off. A custom tune with EGR off should fix your problem, but running it that way should hurt anything. I checked mine EGR on and unplugged and didn't see any mileage differences. It limits the turbo range, so you get a little more boost down low and less up top.

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