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Threads types on GT series BB turbos?? Metric...etc

180bfj20det

By 180bfj20det,
in Engines & Forced Induction

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MonstaS4 Collaborator

MonstaS4

Posted
Posted

I also had a heap of trouble finding the correct size. I foolishly didn't write it down when i found the right fitting. I think it is 12x1.0mm but i'm not 100% on that. It must also have an inverted flare. Best bet is to get one from here....

http://www.horsepowerinabox.com/HPIAB2/category2_1.htm

Water fittings are 14x1.5mm as you mentioned.

paulr33 Grand Master

paulr33

Posted
Posted

search back about 6-8 months ago, r31nismoid (im pretty sure) gave the same answer to someone else who had a similar question regarding the oil feed, i recall that he's one at least had a built in reistricitor so it didnt need an inline one, best do a search as i cant remember exactly

discopotato03 Grand Master

discopotato03

Posted
Posted

I got mine from Earls and don't quote me but I think it was an imperial 7/16 x 24 TPI inverted flare . It is critical to use that flare as the conical insert in the top of the housing locates the bearing pack . BB turbos need less oil than bush type (annular contact ball bearings have much less contact area) and if you dont restrict it the excess oil causes drag and oil seal leakage problems .

Cheers A .

180bfj20det Community Regular

180bfj20det

Posted
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Posted

Thanks

I rang horsepowerinabox.com. He deals the garrett BB GT range and sells everything to go with them and so I trust his reply. He mentioned that the GT series do have an internal restrictor and so you dont need a fitting with a restrictor. You DO NEED however the reverse flare.

Thanks

R31Nismoid Grand Master

R31Nismoid

Posted
Posted
Please, if you run a BB GT series turbo, tell me if you run this restrictor please as I want to do the right thing. Ill contact horsepowerinabox 2mrw anyways.

Cheers

yes, no restrictor required.

There is an internal .7mm restrictor on the turbo cartridge itself.

Just make sure you get the flared end so that it mates to the turbo.

Or just get a speed-flo fitting from your local fittings ship (puprle pig/enzed/ HIS Hose)

they come ready to go, only cost a few dollars and just screw in

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