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i just installed my custom turbo kit, and i run it, when i set de boost controller on low 4 psi it runs ok, but when i turn to hi 6 pi i can only see 3 - 3.5 can andybody now why is that?

 
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What type boost controller do you have?

 
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Make sure the settings are all set correctly to your wastegate. They have settings for external wastegate, internal wastegate, electronic pop off, there are a few settings. So just make sure its set correctly, and that the in and out are hooked up correctly. Are all the wires hooked up correctly, good ground??

Hope this helps, good luck

 
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i have the profec b spec 2 greddy

 
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Do you have jumpers on the back of the control unit part. where you adjust it?? Make sure they are set correctly if so. Did you read my last post?? any answers?? those may help

 
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yes everything is correctly

 
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bump the gain up 1-2 points and try that

 
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That profec b spec II is a pain. Make sure that every time you start the car, you cycle from hi to lo, then back to hi or vice versa. It was always inconsistent for me unless I did this.