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Old 03-13-2008, 07:19 PM   #1
brandnew161
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setting psi on internal wastegate..

I took the turbo apart today to clean all the gunk out of it from the previous owner. I also had to put in a new oil inlet since it was used with a rubber hose barb. I wanted to used a braided line so i needed a new adapter obviously. BUT the inlet was right below the flange...so the adapter and new hose would not fit. So i clocked the turbo a little and now the inlet is out from under the flange. Since this turbo has an internal wastegate, that moved with housing as well. I'm not sure what the wastegate was set to before but that really doesnt matter..i just need it set to 10 psi MAX because i'm on stock internals. The wastegate actuator is adjustable but i'm not sure how to set the psi. I know that shorten=high psi and longer=less psi. But how do i set it so that the wastegate opens at 10psi? I was using an air compressor that was set to 10psi..hooked it up to the boost gauge and it read 10psi...so i then hooked it up to the wastegate and the wastegate door opened halfway. Is this right? Thanks in advance


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Old 03-13-2008, 07:39 PM   #2
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Almost all internal wastegates are non-adjustable...the only way to change it is to weld the internal wastegate shut and go with an external wastegate configuration.
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Old 03-13-2008, 07:52 PM   #3
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Right, but since i am tightening or loosening the nut and arm of the actuator, isnt that adjusting the max boost level?
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Old 03-14-2008, 07:46 PM   #4
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Got Boost controller? LOL

BTW the wastegates with the nut on them are usually adjustable. Adjusting is still easier with a boost controller though.
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Old 03-14-2008, 08:13 PM   #5
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i can get a greddy real cheap but i dont need it. The IW arm is deff adjustable because i've been moving it and all that. But heres my question. If i want 10psi MAX...the flap should start opening around 6psi and then be 100% open by 10psi right?
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Old 03-14-2008, 08:51 PM   #6
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That why internal wastegates suck: boost creep. But If you already started screwing with the adjustment the only way to figure out where it is, is to run it and see what the max boost is take it easy though. I is really easy to have a turbo blow your motor. However, to answer the post above, yes that is how it will happen.
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Old 03-14-2008, 10:16 PM   #7
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changed my mind, i'm goin to get my buddys Greddy Profec B-Spec II tomorrow. i want to play it safe
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Old 03-14-2008, 10:33 PM   #8
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Ah ... good choice. Man I am helping you everywhere .. j/k. Plus those fancy electronic boost controllers can sometimes help you turbo boost faster by messing with gain IIRC.
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Old 03-15-2008, 07:19 AM   #9
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yea i need help with some of this stuff. Its gets overwhelming and messes with your head lol. The last thing i need is a bent rod or cracked piston
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Old 03-15-2008, 08:11 AM   #10
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n/p yeah boost is great and all, but it does add alot of stress to your engine. Post up if you have any more questions.
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