What turbo is this? GT28R? N1?

[cbh148]

So I went to a buddy's house earlier tonight to look at a pair of supposed "GT28R" turbos. i'm doing a CA18 swap here soon and i've been looking to start out with a budget t28 setup (stock ecu, stock MAF, stock injectors, although i do have some 440cc injectors and a better MAF laying around from a z32 or maxima or something, just don't want to pay for a rom tuned ECU). my buddy runs a small shop that specializes in 240's, and he promised me that one of these "GT28R" turbos would bolt right on to my CA18 and would not require anything else done.

i don't know much about turbos, i've only really had KA's so far. i looked at these turbos which the guy claims he got off of an rb26 and he said they're ball bearing. after all, he said they're GT28R's. also, he keeps referring to them as N1's. i don't know what any of this means. so i took pics of both turbos, showed a different friend later tonight, and he said that it's s*** because these turbos are t25's, and they argued over the phone about it lol. buddy #1 swears he knows what they are and what engine he pulled them off of, and says they're GT28R's, but buddy #2 swears that RB26's never came with t28's.

he wants $300 for one of these "GT28R" turbos and that includes him making me a downpipe. both turbos were in good condition, so i don't really care which one i get. please help me figure out who's right, and decide whether to buy these or not! thanks nico

[scotty-2-forty]

You're looking at the compressor housing of the turbo 'unit'. Is there an identification name plate? The Garrett GT25's have an A/R of .64. That turbo says 42 on the side which means it could be a GT2259, GT2859R or GT2860R. See if you can measure the turbine wheel inducer diameter and the compressor exducer diameter (millimeters) with a micrometer or the like. Then, refer to this:
http://www.turbobygarrett.com/turbobyga ... _sheet.htm
Also just a note, the "R" at the end of Garrett turbo models indicate ball bearing. I would definitely contact Garrett directly for a precise answer. Hope this helps.

[scotty-2-forty]

The Garrett GT25's have an A/R of .64.

Please disregard.

[scotty-2-forty]

... Also, "N1" is the Nismo upgraded and modified version of the RB26DETT. They all used the Garrett T25's (R32/R33 used journal bearing, R34 used ball bearing) and you can check if the one you're looking at is from an N1 RB26DETT if the turbine wheels in the turbocharger are steel, not ceramic like those used in the normal RB26DETT.

[cbh148]

Ok, so I bought the turbo from the Guy A that swears it's a ball bearing T28, but Guy B saw it in person now and swears it's a T25. Not only that, but he says it will not work on my CA18 because it can't be clocked enough to bolt onto the OEM turbo manifold because it would make the waste-gate actuator sit at a weird angle and the piping coming off the turbo would go straight into a frame rail. Guy B also says the mouth on the flange is narrow and that that's a bad thing.

Now Guy A says that he will be welding me up a set of intercooler pipes and a downpipe/elbow, and he says that it won't be a problem.

So here's the questions for you guys:
1) What turbo is this? Is it ball-bearing/journal? Ceramic/steel?
2) Should I put it on my CA18DET with stock injectors/MAF/ECU ? or just get an s15 T28 (and use stock everything still)?

[cbh148]

Also worth mentioning, Guy A says that if this turbo won't work or smokes or screws up in any way, I can have my money back.

[OutToWinPAHC]

http://www.turbobygarrett.com/turbobyga ... enter.html
http://www.turbomaster.info/eng/turbos/ ... arrett.php
http://homepage.ntlworld.com/tbroom/Turbos.htm

The first turbo on the bottom link is that turbo
Compressor
Housing Compressor Wheel Compressor
Wheel (mm) Compressor
Trim Compressor
A/R Turbine
Housing Turbine Wheel Turbine
Wheel (mm) Turbine
Trim Turbine
A/R Cut back Core
Bearings Comments
As pair
BNR32 & R33 (14411-24U00) T3 T3 42.5 - 60.1 50T 0.42 T25 T25 41.5 - 50.5 62T 0.48 270° Ceramic
~450PS

[cbh148]

so it doesn't have an outright name, like "GT1234" or whatever? Would you say it's more of a t25 or a t28 (just to settle the argument) ?

And seeing as how it's somewhat of an oddball turbo, I wonder if it's worth using compared to just getting an s15 T28 or a stock T25.

[s13drifter88]

The turbo's are a garret 2259. theyre a little smaller than a t25g. the only one skyline that was supposed to have a pair of t28's (2560's) was the r34 z-tune but later wound up with a pait of ihi"s. the 2559r is a bolt on upgrade turbo like the 2560 is for a red top or the 2871 is for an s15 sr. the only nissan to have a stock "t28" was the s15 and in garretts books is as we all know a gt2560r. the rb25/rb25neo and turbo z31's before april of 87 had t3 "28" turbos (also including rb30et, fj20et, fj24et(homologated 240rs), and I think the Z18et). also the tiny inlet into the exhaust housing wont let the motor exhale for sh*t. remember it onlt has 1.3l via 3 pulses of air flowing thru it thoretically. 500cc jump in displacement plus 1 more exhaust pulse can be a pretty singnifiacnt increase in flow. think about a t25 on a ka. they do fine on an sr but on a ka the little hair dryer has already started to become inefficient before it makes wastegate pressure. its also going to have feed 4 cylinders sucking in vs 4 exhaust pulses coming out. that means back pressure in the manifold is going to increase while air delivery is going to decrease. if it can get it out, it cant take it in. id go for no less than a legit sr t25g