how to choose the spring of its dump valve on s65 G POWER

seb.apprenti

Corporal
Nov 28, 2018
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reunion island
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hi friends, i hope my question isn't stupid
I take care of building for a friend an S65 G POWER sk2 with syvecs box, mapping by racecal ltd
we will install a tial or NUKE dump valve
the vacuum value is -7 psi and the compressor blows at 10.2 psi
which spring should I choose?
 

derekgates

Lieutenant
Feb 23, 2018
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2011 335is
Can you perform this test with a vacuum pump like a MityVac?

1604159637595.png



That way you could find the exact vacuum needed?
 
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