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Discussion Starter #1
Hello guys, I have a generic t3/t4 turbo with a larger than 1/8" npt oil feed port.


Anyone care to share some more common sizes found on these?

My turbo came with a restrictor that engages a 1/4" fitting one turn then stops.

Could it be m10x1.25 or m10x1.5 or m12x1.25 and so forth?

Sourced turbo via eBay vendor, I know -3an feed line to 1.5mm restrictor ( about .060" )

Just trying to regulate oil pressure at the turbo inlet without using a cheesy restrictor plate.
 

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With all the different turbos out there. you're better off taking it to the hardware store and finding it yourself. I have 2 garret turbos and both are different, so are the oil drains.
 

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ej8
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as said.
Its best to check with where you got the turbo from and start with that size.
When i got my first turbo i must of order 3 fittings before finding the correct one.
I believe most are m10x1.5 tho.
However they do come in all different sizes.
 

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Discussion Starter #4
The thread pitch ended up being M12 x 1.5

I resorted to using a M12 x 1.5 male to 1/8" NPT female thread adaptor to use my B&R restrictor.
 

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Thanks for updating, but could you add a pic of the turbo in case someone in the future may need this info?
 
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