For the Nissan Boyz.

[Silent Knight]

Ok this might be the wrong place...if so I do apologize but it sounded semi technical to me.

This question is for intended for the Nissan boyz or people who knows Nissan boyz.

Has anyone got the specs on the S15 T28 (?) Turbo?
Also how much would I expect to pay for a good working on these...or 2?

Thanks for the help.

Hanré

[cynakyl]

Hey, i had a ferret around the SNZ site and found this.

Factory Nissan Pulsar GTiR T28

TURBINE SPECS: T28

.86 A/R Housing

~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

79 Trim Wheel

COMPRESSOR SPECS: T3

.60 A/R Housing

60 Trim Wheel

Compressor Flow: 33 LB/MIN

AFAIK the GTI-R turbz have a slightly bigger housing than the s15 ones, all this does is it comes on boost slightly later than the s15 t28 but if you put a 360 degree thrust bearing in it it will be heaps better.

You could prob pick up a second hand one for 4 to 5 hundy and get it reconditioned...

- Gary

[Silent Knight]

I'm really after the later model BB ones.
I wanna have a bit of a play with 2 of those on the 1J and see what happens.

[Ako]

Call it 500 each, your call if you'd want to get them reconditioned.

Plus modifying your manifolds to fit them, then making new dump pipes + plumbing them up...

Could work though, personally I'd just go to a slightly bigger single for what you want. Pair of those on a 2.5 isn't going to be what I'd call the "responsive" setup you were after dude.

[Silent Knight]

Yea the responsiveness I want with the car basically stockers.

I'm aware that when I start playing around with different turbo applications that, that will be greatly affected depending on application.

Reason I'm after the latter S15 Turbo is because it's BB so I won't be sacrificing that much really. I have seen similar setups in Australia with different sorts of turbo and as far as I can tell from the people who did it, not much in the way of responsiveness was sacrificed if setup correctly.

This will also be something completely different and provide lots of much needed extra power.

Note: I have not fully decided on exact application I want yet which is why I'm asking for the specs of these turbos.

[Lith]

Twin T28s are often used on RB26DETTs and can develop a lot of power - but they DO have a fair bit of lag, I guess you have to define what you mean by responsiveness etc. Expect all your power to start piling on after 4000rpm, and the potential for near 400kw @ wheels.

[Ako]

http://www.nzperformance.co.nz/store/vi ... 860R%20GTR

Ok, ignore the price on them ($&#$% whats going on there), but anyway.

These are BB replacements for the GTR huffers, and have options to flow from 350hp a piece, to 450hp each. The 350hp options end up with slightly FASTER spool up than stock, around 3200. The 450hp ones are closer to 4000rpm, middle of the range - you work it out.

The RB26 is more than just 100ccs bigger though, the things are weird in what you can get away with on them. They have a fairly high threshold from factory, and what is termed a good powerband on a 8500rpm skyline isn't quite suitable for a 7000rpm 1JZ. In terms of turbo sizing, you can get a turbo suited for a supra and happily stick it on a GTR and have the same powerband - just, delayed 1000rpm

That said, considering the S15 units are realistically equivalent to the 350hp units, you should get a decent sort of result out of them. And like you said, being ball bearing they should be responsive once woken up.

[Lith]

Are the S15 ones that big (GT2860R)?? I for some reason always thought of them as GT28Rish kind of spec... I've been in a GTR running twin SR20 T28s, and they are reasonably laggy. I guess its conceiveable they weren't ball bearing.

[Ako]

I was just using them as an example - I've always understood the S15 units to be ball bearing as well to be honest.

Also, I'm going off our suppliers reccomendations on the turbo sizing. They seem to reckon that the lowest spec BB upgrade will bring boost on equal, or quicker than, the stock turbos on the GTR, albiet with a stronger top end. Not sure if the N1 turbos are BB or not though - guessing you can set me right here But thats essentially what they are, a ball bearing equivalent N1. The higher rated ones are the same turbos with bigger wheels, and in the 450hp unit a larger exh housing as well.

[Lith]

I don't know what the T28s came off, conceiveable that they were S14 ones of some description. I am pretty sure S15 turbos are T28BBs. I think the N1s are also BB

[Silent Knight]

The T28s came off of SR20s.
Not sure if they did CA18s...those I'm sure are T25s.

The later model SR20s came out with the T28BBs. I think some S14s had the BBs aswell.

[RS13]

Nar, CA18's only came with T25s, maybe T25G's if you're lucky and got a NZ new 200sx, I've seen 3 with the T25G turbos now, seems to be luck of the draw! I've also heard/read that the T25G's flow more than early T28's, may be a cheaper option? Those BB (facelift S14, S15) T28's are very hard to get hold of, most people (well, when i was looking for my CA18!) want $700 - $900 for one in decent condition, whereas T25Gs may be considerably cheaper with a better result? Worth looking into anyways.