Boost Levels for GT3071r on 2.0L Build

[Seerlah]

Is your compressor housing port shrouded? If not, may be your issue.

[00black1.8t]

Is your compressor housing port shrouded? If not, may be your issue.

nope

[00black1.8t]

Here are the two videos, one below 25 psi third gear.
the other above 25 psi (probably the worst of the flutter here). I varies at times depending on outside temps and so forth.
I have been able to hold 25 with out flutter or very minimal at times.

Below 25 psi
http://youtu.be/lj3EvuocN0o

Over 25 psi Flutter/Surge
http://youtu.be/bf8UWK0dLX8

[M-Hood]

Here are the two videos, one below 25 psi third gear.
the other above 25 psi (probably the worst of the flutter here). I varies at times depending on outside temps and so forth.
I have been able to hold 25 with out flutter or very minimal at times.

Below 25 psi
http://youtu.be/lj3EvuocN0o

Over 25 psi Flutter/Surge
http://youtu.be/bf8UWK0dLX8

With colder temp your idle vacuum will tend to increase since the air gets denser, so that could be 1 issue. When it is colder outside have you checked to see if your vacuum is higher then 19 inHG?


If you aren't feeling any actual misfire, it could just be that your gauge can't handle pressure above 25psi. Won't know if that is the case till you get a gauge that reads higher.

[00black1.8t]

I have not seen any idle vacuum above 19 inHG. But I was worried that it was defiantly in between what spring ratings are.

I will buy a new boost gauge and see if that does it but I defiantly hear the flutter/air release from the engine bay. It does not cause misfires or bucking from the engine. That's why I believe its more so the waste gate than bov. I plan to disassemble the wategate spring and verify I don't have a broken spring or anything. I should see a base boost of 20 psi and not the 16 I get when I turn the boost controller all the way down. All I can think of is that I have a bad spring or something.

[00black1.8t]

So I was trolling around here after a few years:
Update for anyone wondering, I have concluded its just that the turbo is working at the edge of its limits. After all the math to find my intake vs exhaust ratios I have determined I am at the turbos limit of efficiency.

Update: This is not correct. See most a few lines down.

[ktsimp721]

So I was trolling around here after a few years:
Update for anyone wondering, I have concluded its just that the turbo is working at the edge of its limits. After all the math to find my intake vs exhaust ratios I have determined I am at the turbos limit of efficiency.

I dig this thread I’m gonna have to be doing the same at some point but I know I’ll be happy 21psi for some time I just wanna get the thing on the road again... happy boosting man !


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