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Still bleeding boost, need help.

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Old May 13, 2009 | 04:54 PM
  #41  
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OK, switched the wastegate reference over to the manifold and it seems to be more constant and not taper off like before but it only made about 4pounds on just the 7# spring, I think though its because of how high a rpm I was at when I punched it. Before It would make no more than .8psi on the 2 step, now it makes 1.4psi. I still plan on pressure testing the BOV again just to make sure I got all the kinks worked out but I'm pretty happy with the results so far.
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Old May 13, 2009 | 05:39 PM
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Originally Posted by WS6HUMMER
OK, switched the wastegate reference over to the manifold and it seems to be more constant and not taper off like before but it only made about 4pounds on just the 7# spring, I think though its because of how high a rpm I was at when I punched it. Before It would make no more than .8psi on the 2 step, now it makes 1.4psi. I still plan on pressure testing the BOV again just to make sure I got all the kinks worked out but I'm pretty happy with the results so far.
That looks like there is still a leak from the BOV. No matter where I go WOT, if I pull through the rpms I still make more boost than the wastegate spring. Thats where I had the pressure go over 7lbs and go down to 6lbs and back up.

On a side note, my 300 dollar eboost2 arrived today to fix that problem
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Old May 13, 2009 | 05:43 PM
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If its making 4lbs, and holding it...then you do not have a leak.


If it was making say 7..then it suddenly drops...you may have a leak.
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Old May 13, 2009 | 05:47 PM
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Originally Posted by 98Camarod
That looks like there is still a leak from the BOV. No matter where I go WOT, if I pull through the rpms I still make more boost than the wastegate spring. Thats where I had the pressure go over 7lbs and go down to 6lbs and back up.

On a side note, my 300 dollar eboost2 arrived today to fix that problem
Originally Posted by stevieturbo
If its making 4lbs, and holding it...then you do not have a leak.


If it was making say 7..then it suddenly drops...you may have a leak.
Here's a copy of the log its toward the end. The boost curve is a little jagged but it varys no more than 1 pound so I think its good but I'm gonna repressurize it and test the BOV just to be sure.
Attached Files
File Type: hpl
5-13-09.hpl (67.4 KB, 60 views)
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Old May 13, 2009 | 05:48 PM
  #45  
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Originally Posted by stevieturbo
If its making 4lbs, and holding it...then you do not have a leak.


If it was making say 7..then it suddenly drops...you may have a leak.
Why would it hold 4lbs on a 7lb spring?
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Old May 13, 2009 | 05:52 PM
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Originally Posted by WS6HUMMER
Here's a copy of the log its toward the end. The boost curve is a little jagged but it varys no more than 1 pound so I think its good but I'm gonna repressurize it and test the BOV just to be sure.
It still does the same thing with the boost (afr) thing. Anyone else have trouble viewing his log?

If you are talking about at 1965 and it only builds 4 lbs, something just doesn't seem right.
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Old May 13, 2009 | 06:06 PM
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Originally Posted by 98Camarod
Why would it hold 4lbs on a 7lb spring?
you dont know much EGBP etc is also pushing on that spring. Just because it says 7lb...doesnt always mean it will get 7lb.

There are lots of variables.
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Old May 13, 2009 | 06:15 PM
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Originally Posted by stevieturbo
you dont know much EGBP etc is also pushing on that spring. Just because it says 7lb...doesnt always mean it will get 7lb.

There are lots of variables.
Even though before he was making more boost on the same setup and all he did was change the reference to where it was suppose to be? If anything, it should make more than what it was making instead of less, then allowing the wastegate to actually work.
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Old May 13, 2009 | 06:19 PM
  #49  
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Originally Posted by stevieturbo
you dont know much EGBP etc is also pushing on that spring. Just because it says 7lb...doesnt always mean it will get 7lb.

There are lots of variables.
Thats what I have heard, those springs are rated for 7psi based on a 1.1 exhaust back pressure ratio.

The only thing weird is that the car almost made 6 psi on the same log, the only difference is that when I hit 6psi I punched the gas below 2000 rpm. Further along in the log where I only made 4psi I went from a 4000 rpm roll, I assume that it made less because of my high (4.10) gear ratio and the rpm I started from.
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Old May 13, 2009 | 06:20 PM
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Originally Posted by 98Camarod
Even though before he was making more boost on the same setup and all he did was change the reference to where it was suppose to be? If anything, it should make more than what it was making instead of less, then allowing the wastegate to actually work.
Its making almost twice as much on the 2 step now though
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Old May 13, 2009 | 06:37 PM
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Originally Posted by WS6HUMMER
Its making almost twice as much on the 2 step now though
Well I can't view the boost amount on the log still. I don't know WTF is up with that. I guess you are going to have to try and run it through a couple of gears and watch the boost. That is what blows about street tuning.
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Old May 13, 2009 | 06:42 PM
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Originally Posted by WS6HUMMER
Its making almost twice as much on the 2 step now though
Nothing strange about that

With the correct timing and fueling etc....you could make enough boost to destroy the engine, regardless of what wastegate you had.
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Old May 13, 2009 | 06:48 PM
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Re-pressure tested, with a little boost line hooked up to the BOV its air tight. I did find one pin hole in one of the welds around a bung that I'm not even using anymore. Guess I'll have to yank it off and tig it up. I dont think it was hurting me too bad though.
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Old May 13, 2009 | 06:50 PM
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No go on the BOV. But it looks like its figured out though.
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Old May 13, 2009 | 06:53 PM
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Originally Posted by 98Camarod
No go on the BOV. But it looks like its figured out though.
I'll know alot more saturday, plan on going to the track if weather permits.

Thanks for checking anyway, I appreciate it.
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