Low Boost, what's causing it?

[GulfcoastStroker]

Howdy, my 02 is running great, just not making a lot of boost, and is hissing very loudly once I let off the gas. It makes 14 psi at WOT and around 3-4 at 70 mph. I don't have high EGTs, so I don't think it's my EPBV. But just to make sure, I unplugged the sensor anyway. The boost jumped up to ~18 psi at WOT, but it's still not full boost, and my EGTs shot up to around 1000. Also, the loud hissing noise is still there. I plugged the EPBV back in for now, but I wanted to see what y'all think my problem might be.

[campbellflage]

sounds about right for canned tunes

[GulfcoastStroker]

Will that make the turbo hiss like that? And I thought we made ~20 psi stock. I figured I'd make around that.


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[campbellflage]

well all trucks are different, but your egt's sound good if your only getting up to 1000, hope thats pre turbo though

[campbellflage]

what kind of hissing noise? Is it more like a intake noise or are you thinking you are having a boost leak

[GulfcoastStroker]

Yea my EGTs are low. It usually is around 800, but hit 1000 when I unplugged the EPBV.


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[campbellflage]

Originally Posted by GulfcoastStroker

Yea my EGTs are low. It usually is around 800, but hit 1000 when I unplugged the EPBV.


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where is your egt probe?

[GulfcoastStroker]

I can't tell if it hisses all the time, but it hisses loudly whenever I left off the gas, like the turbo is unspooling.


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[GulfcoastStroker]

It looks to be tapped pre-turbo. They were on the truck when I bought it.


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[campbellflage]

Its in the right spot, you can build a boost leak detector cheap with parts from lowes or home depot but your egts sound great. Its hard to know what kind of sound your explaining, maybe post a vid.