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wastegate boost reference line 

 

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 Post subject: wastegate boost reference line
Posted: Wed Sep 22, 2010 11:38 pm 
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hey guys

whats the best spot for an external wastegate to get its boost reference from?
the turbo outlet has a boost line fitting on it, im assuming its for the wastegate,
now from my understanding (correct me if im wrong), the boost pressure at the turbo outlet will be different to the pressure in the manifold due to boost lost through the intercooler..
so if the boost pressure at the outlet is 7psi and if it lost 1-2 psi through the cooler realisticaly the engine and boost gauge would only see 5 psi is this correct??

now if i run the wastegate boost line to the manifold the wastegate will open at a honest 7 psi at the manifold does this make any sense???
or is my theory wrong?
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 Post subject: Re: wastegate boost reference line
Posted: Wed Sep 22, 2010 11:50 pm 
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you're spot on.
You can hook it up to anywhere thats pressurised.
mine it off the manifold (brake booster hose to be exact)

 

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 Post subject: Re: wastegate boost reference line
Posted: Thu Sep 23, 2010 12:15 pm 
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EFFalcon wrote:
you're spot on.
You can hook it up to anywhere thats pressurised.
mine it off the manifold (brake booster hose to be exact)



thanks...
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 Post subject: Re: wastegate boost reference line
Posted: Fri Sep 24, 2010 9:19 am 
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YEP !! Keep in mind after the throttle body it will get vacuum on de throttle...
"Some" wastegate diaphragm don't like vacuum...

 

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 Post subject: Re: wastegate boost reference line
Posted: Fri Sep 24, 2010 9:20 am 
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hmm. i didnt think about that..
its a 45mm tial wastegate if that helps...
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 Post subject: Re: wastegate boost reference line
Posted: Fri Sep 24, 2010 9:23 am 
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TROYMAN wrote:
hmm. i didnt think about that..
its a 45mm tial wastegate if that helps...

Yea built like brick out houses.. You'll be fine either way...

 

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 Post subject: Re: wastegate boost reference line
Posted: Fri Sep 24, 2010 11:16 am 
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cheers thanks.. :D
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 Post subject: Re: wastegate boost reference line
Posted: Sun May 15, 2011 10:02 pm 
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If your not going to use your compresser housing as the wastegate reference
without a EBC to accuratley compensate and worried about the pressure drop
due to intercooler and piping design.., instead of using your intake manifold as
the reference why not just tap into the piping a few inches before the throttle
body??

 

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 Post subject: Re: wastegate boost reference line
Posted: Fri May 20, 2011 5:19 pm 
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I'm running the boost reference off my intake manifold to the ext. wastegate and have no problems
I've heard that way, the turbo comes on harder than running off your turbine
housing, but I could be wrong.

Alex
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 Post subject: Re: wastegate boost reference line
Posted: Fri May 20, 2011 5:53 pm 
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i originally i had it running off the manifold, i did find it seemed to spool a little better but did spike a tiny bit, i just put it down to a slight delay in the wastgate responce due to the extra long hose?
but i did change it over to the turbo outlet and i noticed i had next to no pressure drop, 0.5psi if lucky which was a good thing.lol..
although i did notice a nice improvement in spool time with using an adjustable boost t, not just the obvious abillity to raise boost pressure but that the waste gate started opening later.

as with no boost t, the 7 psi wastegate spring would start to open around 4 psi and open further to maintain 7 psi..

where the boost t delayed the pressure to the waste gate untill the boost t receiced aprox 6psi and the waste gate would open almost instantly, which appeared to give a faster spool time..
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