t2-t25 turbos
Turbo Mini Forums

Hi, I have a T2 turbo from a fiester that has the three bolt flange, is it possible to use the exhaust housing from a T25 to convert it to a normal 4 bolt flange?

Probably not. The turbine housing is also matched to the wheel trim - so that would also need to match. Maybe you can find one by travling the mellet site nd figuring out what you have vs what is on other turbos and seeing if there is something that is a match. Maybe worth an hour or so of looking, but if you get no joy, I'd move it on and find something suitable - like a GT17

I have a GT15. That also has a three bolt flange. The reason I ask is that having a metro turbo manifold with a T3 flange I can get an adapter to step down to a T2 standard 4 bolt. But cant find anything for a 3 bolt. The T25 smoked when it was on my coupe 220 turbo and the compressor blades look like they've been shot blasted. So I think a rebuild of that is going to be expensive. Im not looking for large boost just 10 psi unless I get a x pin diff.

Also going to be turbo charging a Maxi 1750 but ill have to make up a manifold for that, depending on what turbo I use for the A series.

I Have made up this rough adapter out of 10mm mild steel to fit my GT1549 to a standard T3 metro manifold:




(very roughly finished but should do the job)

(Dont know why the pics are so small)

Edited by smokestack-lightning. on 26th Nov, 2013.

Double-Blind experiment, N:
An experiment in which the Chief Researcher believes he is
Fooling both the subject and the lab assistant. Often accompanied by
a belief in the Tooth Fairy.

That looks good. My gt15 flange is different from yours though. Its more like the fiesta rs type fitting. Just a thought though, with how wide the t3 flange and the manifold pipes are would the flange you made not partiality block the exits from the two side pipes of the manifold when bolted up? If so a T3 spacer would create some space between the two. I think I may have to copy your idea though.

yeah there is still a bit of throat modification required but im also trimming the ribbing in the manifold to give a centralised flow earlier to try and help it channel in to the adapter/turbo

Double-Blind experiment, N:
An experiment in which the Chief Researcher believes he is
Fooling both the subject and the lab assistant. Often accompanied by
a belief in the Tooth Fairy.

That sounds like a plan, I know mines cracked slightly in the ribbing in the center. Where did you get hold of the metel for the flange from?

lol working in a workshop with wagons and landrovers....there was a 5ft by 9 ft plate of the stuff we use for heavy fittings etc......so just workshop stock really

Double-Blind experiment, N:
An experiment in which the Chief Researcher believes he is
Fooling both the subject and the lab assistant. Often accompanied by
a belief in the Tooth Fairy.

as said id be trying to get a more stream line flow from mani to turbo
but i like the simplicity of its all about getting it done