Manifold To Turbo Stud Size And Pitch

[QWK32]

Does anyone know what the stud size and pitch for the stock C34 RB25 manifold, where the turbo bolts onto is? i need to track some down this week but don't really have the time to take one off and id it.

[lachlanw]

same as every other rb

[darrinspencer]

The factory ones are 12x1.5 in the end that screws into the manifold and the other end is 12x1.25 thru the turbo so that the finer pitch pulls the turbo up tight. Or it could be 12x1.25 and 12x1.0. Can't remember. If you are just replacing the factory ones, best grab the genuine ones.

Are you fitting the larger turbo and spacer plate you mentioned to me?

I could only find one place that sold longer manifold studs and that was GCG turbo in Sydney. They look like they could be custom made

Just be ready to bend over and take it

[QWK32]

same as every other rb

cheers mate, very helpful.

The factory ones are 12x1.5 in the end that screws into the manifold and the other end is 12x1.25 thru the turbo so that the finer pitch pulls the turbo up tight. Or it could be 12x1.25 and 12x1.0. Can't remember. If you are just replacing the factory ones, best grab the genuine ones.

Are you fitting the larger turbo and spacer plate you mentioned to me?

I could only find one place that sold longer manifold studs and that was GCG turbo in Sydney. They look like they could be custom made

Just be ready to bend over and take it

yeah they are for the spacer plate and larger turbo so i need to get the longer ones. M12 x 1.5 and M12 x 1.25 sounds like it could be it, they are both standard fine threads.

[darrinspencer]

yeah they are for the spacer plate and larger turbo so i need to get the longer ones. M12 x 1.5 and M12 x 1.25 sounds like it could be it, they are both standard fine threads.

Correction, they are 10mm, not 12mm. Just measured them

[QWK32]

Correction, they are 10mm, not 12mm. Just measured them

thanks for that Darrin. i was just looking at a turbo flange plate i have here and the thread in it is M10 x 1.5.

Edited November 23, 2009 by QWK32