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Old 08-14-2006, 10:08 AM
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Hi guys(and gals?)
I'm new here. I just bought an '03 F250 Lariat Crew Cab with the 7.3. I bought it to full my Jeep (rock crawler) to different off-road events.
I bought it with a 4" lift and 35's. Otherwise stock. I had a 4" turbo back exhaust installed and put a K&N intake system in it. I also just installed the Hypertech HyperPac computer/programmer. Seems to rip pretty good, but it's my first Diesel, so I don't have anything to compare it to.
How much boost is this thing supposed to create? It seems like it takes a lot of throttle to create boost. Not like the turbo cars I've had in the past. Is this normal?
I'm a complete noob, so please excuse my simple questions. This forum seems to the place to be.
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Old 08-14-2006, 10:12 AM
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hey man welcome to the forums!

How much boost are you seeing now?
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Old 08-14-2006, 10:14 AM
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I haven't completely stabbed it in "Power Level 3" yet, but the highest I've seen around town is around 6psi. Doesn't seem like much. Although it moves pretty good.
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Old 08-14-2006, 10:15 AM
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should be getting 22 or 23 I would think...6 is real low.
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Old 08-14-2006, 10:19 AM
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6psi What gauge are you looking at? I think the stock 7.3 will peg at 16.5 psi (or so). With mods i'd expect to see you nearing 20psi.
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Old 08-14-2006, 10:24 AM
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The HyperPac has a boost gauge. Is that accurate? I'm going to record some runs tonight after work to see what I'm maxing out at. Hope my Turbo is good!:pray:
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Old 08-14-2006, 10:29 AM
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My 7.3 made around 16-17 bone stock, you should be making more than that for sure with the programmer. Let us know how it goes.
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Old 08-14-2006, 11:05 AM
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Thanks! This forum is sweet!!
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Old 08-14-2006, 11:06 AM
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Quote:
Originally Posted by MNDIZZLE
Thanks! This forum is sweet!!
How come your not a PREMIUM MEMBER yet?!
Just do it!
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Old 08-14-2006, 11:39 AM
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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.
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