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i have a 2003 lb7 and i got a aem bruteforce intake and a ppe standard with the ppe boost valve and i installed a boost guage last night (autometer) and when im accelerating (half thottle+) the guage goes up but the needle shakes alot not sure if thats normal, but its saying im only getting 15-16 pounds of boost and why is that???? i installed the t in the line on the wastegate side of the boost valve there for the arrows on the boostvalve are pointing at the t in the line... where did i go wrong should i not be putting almost 30 pounds?.... please help, im sure any help will lower my frustration levels greatly

Thanks in advance, Shane:hel
 

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Boost leak possibly? Check all the piping EVERY one of them. The tiniest hole can cause a huge drop in boost pressure. Soapy water helps in finding the small ones, others are obvious..
 

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I doubt you are going to see 30 PSI with a PPE on 120 but 15-16 is pretty low. I am probably wrong but I think the T is suppose to go on the turbo side of the BIV not the wastegate side, but I didnt install mine in that line I drilled and tapped a fitting into the intake going into the engine. Might just try it on the other side of your boost valve I dunno it might make a difference.
 

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you need to be on the other side of the boost valve...the arrow points at the wastegate right? if so...the pressure there will be lower than on the other side.
 

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ya move the boost velve. had a customer bring his the other day doing the same thing. but 30 psi u prolly wont see that
 

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About the boost leak part,....

It's easy to get a leak on the plastic lines when using the brass swedge type fittings, what I did was I went to a hobby shop and there they have small brass fuel type lines for model airplanes and what not, get one of those rods and cut a piece to slide inside the plastic boost hose, this will keep the swedge/ring straight when tightening the fitting.
 
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