What kind of boost numbers should I get? - Ford Powerstroke Diesel Forum
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post #1 of 15 Old 05-22-2011, 05:40 PM Thread Starter
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What kind of boost numbers should I get?

I have an e99 F350 that is all stock, except for a 4" exhaust. I just got it. I installed an Edge Insight CTS and took it out for a spin. On level, flat ground at around 40 mph, I was only getting 1 lb. of boost and on the freeway at 75 mph I was only at 3 lbs. I took it up a steep hill and the boost went up to 5 psi at 75 mph. Then I took it up a steeper, longer hill at WOT. Boost went up to 12 lbs for a second, but mostly stayed between 9-11 psi.

Are these numbers normal for a stock PSD?
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post #2 of 15 Old 05-22-2011, 05:51 PM
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Sounds about right . Where does it go at wide open throttle . Mine is an E-99 as well . Sounds about like yours . At w.o.t. it goes to around 20 psi . Mine is all stock except it is strait piped .

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post #3 of 15 Old 05-22-2011, 05:54 PM Thread Starter
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Sounds about right . Where does it go at wide open throttle . Mine is an E-99 as well . Sounds about like yours . At w.o.t. it goes to around 20 psi . Mine is all stock except it is strait piped .
The most I saw was 12 lbs. @ WOT going up a very steep hill.

So I'm guessing that I'm falling a little short then? (Story of my life).

Would this be an indication there's some wear on the turbo?
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post #4 of 15 Old 05-22-2011, 05:57 PM
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The most I saw was 12 lbs. @ WOT going up a very steep hill.

So I'm guessing that I'm falling a little short then? (Story of my life).

Would this be an indication there's some wear on the turbo?
Well , that or a boost leak some where . I would start by checking the line to the gauge , where did you hook it up on the intake ?

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post #5 of 15 Old 05-22-2011, 06:14 PM
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Yes, check all of your inner cooler boots and make sure they are all clean of oil and are tight. Check the up pipe exhaust gaskets behind your turbo to see if they are free of soot. If they do have black soot around them you will need to replace those exhaust gaskets/donuts. That is a very likely place to loose boost on a truck that age. Good luck and let us know what you find. You should get any where from 18-24 psi with the programmer in your truck. Just varies on your driving habits. My truck barely breaks 5-8 psi when on the interstate.
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post #6 of 15 Old 05-22-2011, 06:20 PM
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i have a e-99 and the most i have ever got was 15 and that was pulling a big trailer up a big hill. the normal for mine sounds about like yours MKeeney

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post #7 of 15 Old 05-22-2011, 06:25 PM Thread Starter
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Originally Posted by Bad Night View Post
Well , that or a boost leak some where . I would start by checking the line to the gauge , where did you hook it up on the intake ?
The reading comes from the OBD II plug, so it's being read from wherever Ford puts the sensor when it's new.

I will check all the pipes though. They're all quite dirty around the turbo. The exhaust looks to be nearly new.
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post #8 of 15 Old 05-22-2011, 06:28 PM Thread Starter
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For what it's worth, I forgot to mention that I put in an aFe Stage 2/PG7 intake system yesterday. That shouldn't have an adverse effect on boost though, should it?

Last edited by MKeeney; 05-22-2011 at 07:37 PM.
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post #9 of 15 Old 05-22-2011, 11:11 PM
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Originally Posted by MKeeney View Post
For what it's worth, I forgot to mention that I put in an aFe Stage 2/PG7 intake system yesterday. That shouldn't have an adverse effect on boost though, should it?
Nope, if anything it should help.
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post #10 of 15 Old 05-23-2011, 12:25 AM
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With a straight pipe I can get to 24psi, but I have a late model 7.3. With a E99 and the WW you should be getting more then what you are.
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