Garrett GT2560R small difference (1-1 vs 1-2)
 

Good morning guys,

I've been reading for a long time and I'm currently collecting all the stuff necessary to make the conversion from NA to FI.

Here it comes the turbo, from the begining I understood that the GT2560R was the one that could do the best job in order to accomplish my targets.

Right now, I've an offer from a guy that doesn't know exactly which T28 it is, The only difference I've been able to notice is that the compressor says: GARRETT A/R60 M24 O1-1. That last reference is what I don't know exactly what they mean, I've seen others which say O1-2. Does someone know what is the difference? Is that the difference between the journal and ball bearing?
I haven't find the difference, even looking at 240sxforums link (Stock T25/28 Turbo Specs - Nissan 240SX Forums). I've asked and there isn't any metal sheet in the turbo to see the reference.

Thank you very much, if you could see something in the pictures which isn't in good shape let me know, I would be very appreciated.


Marc

It looks like a 2560 of some description

It's not a T28 turbine it's the quicker spooling T25 11 blade version

Can you take a picture of the turbine shaft through the oil drain

It definitely a Nissan fitted turbo so you'll need the adaptors for compressor inlet and outlet

Thank you very much, I've found this link, but I'm not able to notice the difference due to my poor english language skills: http://turbochargerspecs.blogspot.co...im-330-hp.html.

It will be a pain in the ass to find the adaptors or is something usual that many miata turboed owners do?

I'll try to upload a picture ASAP the owner sends it to me.

Adaptor example
http://www.ebay.co.uk/itm/121367659470

It looks like the GT2560 BBfrom the last S15 Nissan. A pic of the shaft through the oil drain should confirm

If so this is a good Miata turbo

Get it

How about a pic of the data tag on the CHRA?

I've found a few adapters as well, do you recommend me this seller?

Waiting for the picture, then I will close the deal.

this.


but pretty sure it's the S15 GT2560 with the Ti wheel.

The seller said that there was no data tag, but he told me that is Garrett. Waiting to get the pic.

Fine guys, so I think I'll shoot for it, considering it's Ball Bearing and it's the one I've always wanted since I started learning about turbos.

Thank you so much! I'll post the pic later!

The S15 GT2560 has an inconel turbine wheel I believe. It also has a divider wall between the turbine outlet and wastegate outlet.

I purchased one brand new from a Nissan dealer less than 2 years ago

i meant Ni, not Ti.

the divider on the outlet is only on the 2860 GTR turbos for the RB26DETT, iirc. Part number 707160-5

not this 2560, and not for the SR20.

If you go to Garretts website and look up the GT2560r it lists a version of it used on the Nissan S15 specR that has an Iconel wheel and divider.

ah so it seems.

It's hilarious I had to argue with somebody over PM on this topic.

On a more related note, OP that's an S14 T28. Same size as a 2560 and the S15 T28, but single ball bearing, lacks the divider between the wastegate and turbine, and no fancy materials.

Why do nissan guys call them t28s and not GT28Rs? that's a little misleading and probably where some confusion lies.

a GT28R = a GT2560R, just the early naming convention. I think that would more accurately describe it.

The GT28RS having the dual ball bearings at the time.

a T28 is typically non-ball bearing, Non GT series. A T28 T28 is typically a T25 turbo upgraded to a T3 compressor wheel/housing.

A T28 would convert over to a GT2860.
A T25 would convert over to a GT2560.

the difference mainly being the size of the turbine wheel, both using 60 compressor wheels.

tl;dr. Kramer, it's a 2560. ive seriously forgotten too much of this stuff to really care anymore

They're all drift guys who don't know any better. I try to cut them a little slack.

+10 props.

Thank you very much guys, below you have the extra pictures that the owner sent to me.

I don't know which ones are from the oil & water lines. Hope them help.

So I've to assume that it's a GT2560R Journal Bearing from an S14?

PD: I guess that BrilloHeadBen had reason, I actually drift my miata! :giggle:

Nope, it's a single ball bearing. See that little restrictor in the oil inlet? Ball bearing CHRA's don't like high oil pressure, and will leak.

Does my turbo require an oil restrictor | Turbobygarrett

*edit*
Since you didn't know, that inlet is the top oil inlet, with the outlet being on the other side of the CHRA. Your water inlet and outlet are 90* from the oil.

The oil drain pic is dark and not visible

Just buy it clean it, clock it and use it

If it's journal bearing T25 T28 / T2560 then it's still great

Mine with a 3" downpipe was fully spooled at 1 bar at 3200rpm

Cheers man, the owner wants 378$ (280€), do you think it's worth? I'll try to pay him 340$, understanding that I'll need to buy the adapters. Here in Spain, unfortunately the stuff is more expensive that in the states.

Yes that's ok price

Just make the adaptors from stainless exhaust components and either weld or silver solder them up

Don't you think that bolting the adapters to the compressor will be enough? (Turbo Compressor Inlet Outlet Adapter Flange Nissan SR20DET s14 S15 T28R GT25R | eBay)

No

If they don't have o ring seals you will need to use RTV sealant on a clean and flat compressor face then bolt

From what I've seen the ones I'm planing to buy from Kinugawa (the link above) have them, so not additional sealing will be needed.

Thank you very much, you've been really useful!

Just for info (I'm not IDing this turbo!), I believe the T28 Journal Bearing predecessor to the GT2560R is the TB2815.

As fitted to the SR20DET in the Silvia/200SX (S14). Same compressor/turbine dimensions as the GT2560R.

Garrett Model TB2815 Repair List - 471104-0001 reference - Turbos - TurboMaster

Wow, the 3" exhaust does wonders then! I may have to add to my shopping list as mine def comes on far later, I top out just under 1bar (~13psi).

I just used generic ebay alloy inlet/outlet adaptors similar to above, they came with basic gaskets that seal fine. Personally I'd avoid the Kinaguwa Turbo outlet shown as it has that superfluous wastegate port. As per various threads on here, it appears to be a better option to take the Wastegate feed from just before the Throttle Body, NOT direct off the the adaptor as show.

There's more to it than just diameter. Downpipe design, manifold volume and design, tune & also air ducting design etc

Also make sure the journal bearings and turbine shaft aren't gummed up with burnt on oil

Ditch any CAT!

3200rpm to beat ;)

Haha, fair play! I'm on FM hardware, with a generic NA 2.25" Cat back system. I suspect that may be the largest restriction in the system at the moment, have fresh bearings in the turbo and no cat.

It's great to know I have plenty of room for improvement!

It's shocking how much post turbine pressure there is even with a 3" system. I had a pin hole in my mid pipe and got under the car with the engine idling and I could feel the gas escaping with some fair pressure

it's not shocking at all. there's at least the same amount of exhaust pressure as boost pressure, plus all the extra pressure from the combustion. I'm sure the exhaust pressure before the turbo is double the boost pressure, then you're trying to force it all out of a 3" pipe while it's cooling, slowing, and expanding.