I'm a turbo virgin; never been in a turbo'd car. I've decided I wanted to turbo my 1.6 Miata, and started slowly piecing together a turbo kit from used parts I can find on FB Marketplace and in Miata B/S/T groups.

Found a GT2560R listed in a B/S/T group and bought it. Being a turbo virgin, I didn't really ask many questions or do any research. All I knew is that the GT2560R is about the best turbo you can run on a stock motor, and since it was listed in a Miata B/S/T group, I assumed it came off a Miata. Received it in the mail and quickly realized something was fishy. The first thing I noticed was that there were studs on the exhaust inlet flange. Every picture I can find on the interwebs show that the GT2560R shouldn't have studs on the flange. I scored a BEGI turbo manifold a while back and it's been sitting in the garage. I went to put the turbo next to the manifold and quickly noticed the studs on the turbo were a lot smaller in diameter than the studs on the manifold. I've heard you can find GT2560R stock on Nissan motors, so I'm thinking this turbo might be from that. How would I get this to work on a Miata?

https://imgur.com/a/UFFNCky

 

You would need a tubular manifold with the ability to put nuts on the manifold side of the mounting flange. Not bad, but different than what you can do with a BEGI log mani.

 

Or source a ball-bearing T25 turbine housing.

 

I've also inquired about the wastegate actuator that came on my turbo on a Miata Discord. I looked up the part number on the sticker and the only result I can find is that it is from a GT2860, and person on Discord said something about the turbo needing to be reclocked to fit a Miata, therefore, causing the wastegate to not fit properly.

 

Since when does a gt2560r have a 9 blade turbine wheel? Has it been rebuild?

Edit:
Googling the partnumber says it's a gt2860r

 

But the plate says GT2560R? I did a bit of reading around, and something about Garrett changing their naming scheme.

 

If it's a 2860r it will still work very well with a Miata. The turbine wheel is the higher flowing 9 blade and that will add a little bit of lag but nothing bad, you'll see full boost around 3600-4100 depending on gear. You know you can remove those studs right? If you get a begi manifold just remove the studs off the turbo and use studs in the manifold itself. And yes you'll need to clock the turbo to make it fit, that's not a big deal it's very easy to do so.

 

Just checked your part # that's a 2860r with a 62 trim compressor and skyline housings. Flows a little more than a 2560r

 

There's no room behind the turbo exhaust inlet flange for me to put nuts, as a user above mentioned, I would need a manifold that would allow nuts on the manifold side.

 

Yea..... That's why I said to remove the studs. They can be removed you realize this right? Like they will come out.

 

Yes I understand that. If I remove the studs off the turbo and use the studs on the manifold, I would need to put nuts on the turbo side. There is no room to put nuts on the turbo side.

 

Why would there not be any room? It's a t2 flange same as a gt2560r.

Looked at your pictures again. I see what you are saying. The housing is not designed to take nuts from the turbo side as you said. That's dumb lol

 

 

Yea I looked at your pictures again after my last post, my apologies. That turbine housing is a compact housing. That sucks

 

If I find someone with a bad ball bearing T25, could I still use their turbine housing? Trying to avoid buying new since I already got hosed on this turbo.

 

if this is indeed a skyline style turbo, then a standard 5 bolt begi/fm downpipe will not fit, the 5 bolt patters is different on a skyline T25 than the normal T25 pattern

 

I am not sure if it will work for you, but I have a Garrett 2560 for sale that needs a rebuild. It could also fix your whole skyline proprietary downpipe situation. Turbo is in awesome condition aside from the whole burning oil situation. But again, I am not sure if you could use parts from it for your turbo or not, you would have to check on that.

Check my for sale thread here:

https://www.miataturbo.net/miata-par...-gauge-102332/

 

I have a new garrett .64 T25 exhaust housing that has been extrude honed. It was for a GT2860RS turbo. Not sure if that’s the same turbine as yours. If so PM me and make me an offer. I have two available.

 

Just for clarity here, a T25 and a T28 turbine are different. I suggest you measure the turbine dimensions to confirm what you have.

 

A member on a Skyline forum linked me this: https://dri.net.au/collections/force...lvia-jdm-turbo