Where did you plumb your boost controller into ? UIM is no good !
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Boosted Kiwi
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From: Y-cat-o NZ
Can you try it with your setup please Kane - do you have a guage you can plumb onto the turbo side of manifold ?
It happens at anything over 0psi in the UIM under partial throttle .
Amongst turbo installers (present company excepted, of course....) there is no debate - the wastegate control signal is monitored and controlled just before the throttleplate. A boost gauge would be placed after the throttle.
http://www.tialmedia.com/documents/w..._wginstall.pdf
There is some debate as to before or after the intercooler, but there is none as to 'should it be off the intake manifold'.
BMW, 350Z, Nasioc, Freshalloy, snowmobile boosters - they are unanimous.
http://www.tialmedia.com/documents/w..._wginstall.pdf
There is some debate as to before or after the intercooler, but there is none as to 'should it be off the intake manifold'.
BMW, 350Z, Nasioc, Freshalloy, snowmobile boosters - they are unanimous.
That is not the debate.
We are all doing signal line from the Turbo Outlet, to the BC Solenoid and then the Wastegate.
But there is a "boost guage" built in to the BC too; and that is what should be behind the throttle body.
We are all doing signal line from the Turbo Outlet, to the BC Solenoid and then the Wastegate.
But there is a "boost guage" built in to the BC too; and that is what should be behind the throttle body.
There is a vast difference between the boost controller signal and the waste gate signal.....
Waste gate is before TB and Boost controller is after.....
The wastegate wants to see what the Turbo is doing...the boost controller cares about what the engine sees
Waste gate is before TB and Boost controller is after.....
The wastegate wants to see what the Turbo is doing...the boost controller cares about what the engine sees
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Boosted Kiwi
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From: Y-cat-o NZ
What we are saying is that the line to the BC needs to be in FRONT of the throttle plate because that line is more than just a pressure guage . It determines when the solenoid activates (via the 'start pressure' or 'set gain' value) and if it is after the throttle it has lost contact with the very thing it is trying to control (under part throttle) .
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Boosted Kiwi
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From: Y-cat-o NZ
What it is designed to CONTROL is the turbo . The throttle plate controls what the engine sees .
actually - it is the debate .
What we are saying is that the line to the BC needs to be in FRONT of the throttle plate because that line is more than just a pressure guage . It determines when the solenoid activates (via the 'start pressure' or 'set gain' value) and if it is after the throttle it has lost contact with the very thing it is trying to control (under part throttle) .
What we are saying is that the line to the BC needs to be in FRONT of the throttle plate because that line is more than just a pressure guage . It determines when the solenoid activates (via the 'start pressure' or 'set gain' value) and if it is after the throttle it has lost contact with the very thing it is trying to control (under part throttle) .
The Set Gain Value is to prevent boost spikes while still preserving spool time. If that set gain value is 0 - then you are not "holding anything back".
If you run a set gain of 0 - and your still getting spikes; your wastegate is too small.
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Boosted Kiwi
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From: Y-cat-o NZ
can you do that test I asked you to do please ?
Yeah I need to get my hands on a mechanical boost guage.
All mine are super high pressure (3000 PSI); so they aren't gonna work.
BTW - if your intake pipe pressure is higher than your UIM pressure....there is this neat thing called a BOV that relieves it. Maybe it is time for you to get a different one or loosen yours. My syncronic activates ALL the time when I drive not just in boost. Any time I close the throttle plate I can hear it.
All mine are super high pressure (3000 PSI); so they aren't gonna work.
BTW - if your intake pipe pressure is higher than your UIM pressure....there is this neat thing called a BOV that relieves it. Maybe it is time for you to get a different one or loosen yours. My syncronic activates ALL the time when I drive not just in boost. Any time I close the throttle plate I can hear it.
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Boosted Kiwi
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From: Y-cat-o NZ
Yeah I need to get my hands on a mechanical boost guage.
All mine are super high pressure (3000 PSI); so they aren't gonna work.
BTW - if your intake pipe pressure is higher than your UIM pressure....there is this neat thing called a BOV that relieves it. Maybe it is time for you to get a different one or loosen yours. My syncronic activates ALL the time when I drive not just in boost. Any time I close the throttle plate I can hear it.
All mine are super high pressure (3000 PSI); so they aren't gonna work.
BTW - if your intake pipe pressure is higher than your UIM pressure....there is this neat thing called a BOV that relieves it. Maybe it is time for you to get a different one or loosen yours. My syncronic activates ALL the time when I drive not just in boost. Any time I close the throttle plate I can hear it.
I can see you and i would have some good arguments over a few beers heh
Yeah man. I might get as close as Australia.... unless you guys wanna sink a US boat in NZ for me....
BTW - the BOV should operate off the pressure differential between the cold piping and the intake mani.... does your BOV have a boost line?
BTW - the BOV should operate off the pressure differential between the cold piping and the intake mani.... does your BOV have a boost line?
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Boosted Kiwi
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From: Y-cat-o NZ
no it doesn't - what is advantage of BOV with a boost line ?
don't worry about the test if you don't have a boost gauge - I just thought you would have had one so it would be easy to do ....
don't worry about the test if you don't have a boost gauge - I just thought you would have had one so it would be easy to do ....
Last edited by Brettus; Mar 21, 2009 at 02:33 PM.
I'm sure I can find one; just gotta put the word out.
A BOV operates on the Pressure Differential between the UIM and the Intake Piping.... so with a boost line and a vacuum line; most BOV's push and pull the two chambers based on the pressure difference rather than JUST manifold vacuum.
With just one line; you can only open it at one static Vac point.
With just one line; you can only open it at one static Vac point.
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Boosted Kiwi
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From: Y-cat-o NZ
The Synchronic sounds like a great BOV. I need to re-read that article a few times to fully understand it ....
It sounds like it eliminates a lot of the issues with compressor surge under partial throttle . If you have the Synchronic there is probably not much point doing that test as it seems that it does resolve the issue.
If you don't have the Synchronic and you plumb the BC the way we are talking about - that helps a lot too
It sounds like it eliminates a lot of the issues with compressor surge under partial throttle . If you have the Synchronic there is probably not much point doing that test as it seems that it does resolve the issue.
If you don't have the Synchronic and you plumb the BC the way we are talking about - that helps a lot too
Last edited by Brettus; Mar 21, 2009 at 03:13 PM.
Yes; recirc is the way to go. Think about it; you want a BOV to open when the UIM pressure is one zillionth of a percent lower pressure than the Cold Side; so that BOV is opening and closing A LOT> You can still stall a compressor even in vacuum if you think about it.
I see what your saying....I would miss the sound though...LOL.
