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Discussion Starter #1
I'm running a 7 psi spring but the car will go to 10-13 before wastegate opens and then goes down to 7psi however by then it's time
To shift .
Is this because my vacuum source from turbo fitting to WG is too small?
 

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what fitting size, and where is the source? (turbo outlet tapped?) or what?
 

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Discussion Starter #3
I'm not sure on size but it's the fitting on the turbo housing and the fitting that came in the tial 46mm wastegate.
 

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Discussion Starter #4
Tried a few diff size vacuum lines with same results. Could the waste gate valve be sticking then get forced up late
 

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This is right from the Tial spring pressure chart....

Note: Boost pressures are only an approximation
based on intake manifold pressures equaling exhaust
manifold pressure.
 

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Discussion Starter #6
I'm sorry I guess I don't understand that and how it could be useful to me
 

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Just because you have a 7psi spring doesnt mean you will get a true 7psi.

Many things could cause it.
 

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Discussion Starter #8
When the wastegate opens it is very loud.the boost spikes high then when the wastegate obviously opens it pulls it down to 7 psi
 

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Discussion Starter #9
I'm running wastegate boost source connected to the fitting directly on turbo housing. So I try running a different boost/vacuum source line?
 

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off the turbo housing is ideally where you would want to source your vacuum/boost..
 

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Discussion Starter #11
Ok running out of ideas now


Could my banjo bolt be restricting flow to the wastegate port if it's not lined up to flow right into the fitting sideport?
 
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