Compression Ignition Addict
Join Date: Apr 2006
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A 7.3 stock will peg out at 16 or 17 like mentioned above. A 7.3 that is tuned with a good and proper power tune will get into the 22-24 range, and a 7.3 with a real hot tune that just about wants to push the heads off the top, push the rods out the bottom, and push the stock turbo into a trash can (This is how mine is tuned currently....lol...) makes about 29 lbs and can kiss 30 for brief seconds at times.
Now, to reply to your question and tell you what I really think is going on....
Your truck has a boost leak!
Take a peak at the engine. The cross over manifold in front of the turbo may have oil all over it. The main intake manifold where the short boots go down into the engine may not be on properly....I experianced this. A cold air tube going to or from the intercooler may be leaking. The intercooler itself may be leaking.
What I did was removed the easiest....the boost tube from the intercooler. I cleaned the heck out of the tubes, and the rubber boots...I reinstalled it tight. I was still about 8 PSI max. So I had Patrick do it a second time while I drank beer. Still about 8 lbs.
Next Patrick and I took that allum part off from in front of the turbo, and I noticed that on the lower side of it is the 2 rubber boots going to the intake...and there was an oil film all over this stuff. We took it all apart, cleaned it like it was a new girlfriend in the shower with us.... and reasembled that god foresaken alluminum manifold. Getting those 2 lower rubber boots on sucks! But....after doing this......26+ lbs of boost....prais ye to the Lord above! Its alive! Stand back........I dont know big this thing is going to get! What I am trying to say, is that you may have something similar to what I had when I got my 2000 7.3 used.....a leaker. Check it out..... 8 lb is too low.