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Rb25 Turbo>manifold. Thread Size

SS#eater

By SS#eater,
in Engines & Forced Induction

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SS#eater Collaborator

SS#eater

Posted
Posted

hi

am am installing a new turbo tomorow and need to run a 10mm spacer so i need longer studs to bolt the turbo down...does any body know the thread size for the stud, the thread thats in the manifold its sel,f not the thread with the nut you tighten...

would take one out as a sample but need the car to get to the shops...

cheers

if someone could tell me wether there is 2 types of thread on 1 stud , 1 end for manifold 1 end for the nut to tighten turbo down...

both thread sizes would be sweet

cheers

:sick:

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https://www.sau.com.au/forums/topic/255157-rb25-turbomanifold-thread-size/
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SDEWY5 Community Regular

SDEWY5

Posted
Posted (edited)

wat turbo u putting on? i needed 20mm spacer for gt3582 with 25mm extended studs. i have a set of 4 as spares when i got local engineer to make them for me. they are a different thread on both sides. Pretty simple though, the coarse thread is what goes into your manifold, the finer thread is where your turbo flange must tighten with. Just take one of your studs out and tell them u need the same stud as it is with the fine thread side extended 12-13 or 25mm depending, obviously in a heat tolerant metal and they will mill you studs to suit.

Edit: the 12-13mm 25mm extension in stud length is to clear the additional gasket thickness also. 25mm longer studs on a 20mm spacer was perfect.

Edited by SDEWY5
SDEWY5 Community Regular

SDEWY5

Posted
Posted

Hey dude, i c ur from Mackay, oddly enough ur name is SS eater, did u ever c a Black VEss up there wit big comp cam and stupidly loud exhaust wit RDP motorsport sticker on the back, had 19" chromies too. Curious as my mate bought that car. dunno how big Mackay is but was wondering if u saw it.

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