Boost leak test BB turbos differently?

[phunny]

I've always done boost leak tests on the inlet side of any turbo but I was told today that it is the wrong way? Thoughts?

 

[crash89]

How would them being either journal bearing or BB make any difference? I dont see why it would matter. Guess Im kind of curious now.

 

[miliman13]

i really don't see the method used being incorrect, but i may be wrong. +This a link that essentially just compares the two .

T series « Tong Turbo Engineering Sdn Bhd

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you test the way the system operates, only though it is maybe its to avoid putting stress on the turbo, or to prevent shaft play. ? anyone

 

[JusMX141]

Shouldn't matter, but if you're just testing the piping system itself for leaks I prefer to disconnect the coupler at the compressor outlet and test there.

 

[phunny]

Shouldn't matter, but if you're just testing the piping system itself for leaks I prefer to disconnect the coupler at the compressor outlet and test there.

So when I can't build over 15 psi during a boost leak test and I have oil being pushed out of my vc it's a problem? And when I removed the turbo there was oil all in the exhaust housing. Any thought on what could cause this?

Once the turbo was removed it boost leak tested perfectly.

 

[miliman13]

sounds like pressure is pushing oil past your seals. i have spoken to Techs from boost lab, and if oil is making its way past your seals it doesn't necessarily mean that they are bad, just that the oil under pressure has to go some were.

 

[steve]

The traditional boost leak testing depends on the oil seals in the turbo statically able to seal pressure in the compressor housing from the center.

I imagine that not all turbos have that as a design requirement. In operation they have oil pressure assisting the seal with keeping any air pressure in the compressor housing from leaking past.