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Old 07-17-2013, 03:43 AM
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No boost

I just finished installing my BPD oil cooler last night. During this project I decided to open the turbo and give it s clean. Before I started I was getting about 15psi of boost at WOT. When I finished the turbo, everything worked like it should, I even pulled the plug on the back of the VGT and worked it with a magnet, everything was free and operating. So sitting in the garage I would open it up a bit and according to my CTS and dash idiot gauge I had 0-1 psi of boost, the VGT% was 77% at idle and would move to 55% as I gave it throttle... Am I missing something? Do I need a load on it before it will really open up?

I checked all my connections, no intake or exhaust leaks could be found...

Thanks for the help.


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Old 07-17-2013, 05:04 AM
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At idle and at low speeds your not going to get much boost your not supposed to.
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Old 07-17-2013, 05:14 AM
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Ran it up to 2500 rpm and didn't get any change, if I have time I will put it out on the highway tonight to see what I get at WOT



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Old 07-17-2013, 05:21 AM
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At WOT you shouldn't see boost either try mid ranges or near WOT. Have you checked for leaks.
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Old 07-17-2013, 05:28 AM
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Ok let me back up, no boost from idle to 2500, nothing in between.

I checked for leaks by hand, could feel/hear anything... BUT I'm in my garage so it echoes a bit... Is there a better way to check for leaks?

Just bugs me that I went backwards on my boost after cleaning the turbo...


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Old 07-17-2013, 04:53 PM
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Well figured it out, the hose from the MAP sensor was stiff, brittle and cracked, the port on the intake was also partially plugged. New hose and a quick clean took me from 1 psi to 23 psi...


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