Garrett GT28 Banjo Bolt Oil Restrictor Size

[lookingforboost]

hey man mine is a 8mm-10mm return line yours looks big enough and its at the top of the sump so thats right, your turbo should be fine but you will need to put the smaller restrictor in it for sure i have a GT28R here with the right size oil restrictor i can put a pic up of and meassure for you? and make sure you have both copper rings on the bolt when you put it back in because that will make it leak as well

[Lukezen27]

hey man mine is a 8mm-10mm return line yours looks big enough and its at the top of the sump so thats right, your turbo should be fine but you will need to put the smaller restrictor in it for sure i have a GT28R here with the right size oil restrictor i can put a pic up of and meassure for you? and make sure you have both copper rings on the bolt when you put it back in because that will make it leak as well

Yeah Ryan I'm quite sure that's the problem.

I called GCG for a price on a rebuild and they asked what was wrong and I explained what's happening.

They told me my turbos fine as the seals are not air tight like I thought they would be and I just need the right restrictor to match my motors pressure.

My dad and I are going to weld and redrill the restrictor with a 1mm hole tonight

[nd55]

> They told me my turbos fine as the seals are not air tight like I thought they would be

AFAIK, generically, there are two types of turbo seals.

Carbon and dynamic.

The new GT series should be dynamic which depend on the the spindle rotating to function.

Carbon seals, were used on non-water cooled turbos and turbos which were installed low, ie below the oil level in the sump and maybe on draw through installations.

This is about the limit of my turbo seal knowledge, so feel free to jump in.

I believe carbon seals are available for T3 frame turbos, if you're rebuilding the GT, it might be something to look into.

There's a book by Graeme Smith for Graeme Bell (I think, Wollongong uni has a copy) detailing oil routing which you might be of interest.

Nick.

[Lukezen27]

> They told me my turbos fine as the seals are not air tight like I thought they would be

AFAIK, generically, there are two types of turbo seals.

Carbon and dynamic.

The new GT series should be dynamic which depend on the the spindle rotating to function.

Carbon seals, were used on non-water cooled turbos and turbos which were installed low, ie below the oil level in the sump and maybe on draw through installations.

This is about the limit of my turbo seal knowledge, so feel free to jump in.

I believe carbon seals are available for T3 frame turbos, if you're rebuilding the GT, it might be something to look into.

There's a book by Graeme Smith for Graeme Bell (I think, Wollongong uni has a copy) detailing oil routing which you might be of interest.

Nick.

Hey Nick

So the faster the turbo spins the better the seal works yeah?

How my D16Y1 box going?