Skyline GTR T28 vs. Saab T25. - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


DIY Turbo Discussion greddy on a 1.8? homebrew kit?

Reply
 
 
 
LinkBack Thread Tools
Old 07-23-2008, 05:10 PM   #1
Junior Member
Thread Starter
 
Join Date: Oct 2007
Location: Staten Island, NY
Posts: 159
Total Cats: 0
Default Skyline GTR T28 vs. Saab T25.

I'm exploring the idea of a cheap DIY turbo kit. I'd like to stay on the small side as far as turbos go (not looking for big power). I know someone that has a tight stock T28 from a R32 skyline that I can get for very cheap. Alternatively, I can get a T25 from a Saab 9-3 for really cheap too. I happen to have a Saab 9-3 as well, and I like the way the turbo feels in that car at 12psi. Top end is nice and strong and it gives good mid-range punch.

I'm having trouble finding specs for these turbos, and I don't know which one I would like to go with. From what I understand I'd need a different exhaust housing for the skyline turbo because of the proprietary flange they use, and the same deal goes for the Saab turbo, although it'd be easier to use a piece of Saab downpipe to make it work. The saab seems like the cheaper way to go. Don't even have to buy those stupid inlet and outlet fittings for the compressor side like I'd have to on the Skyline turbo.

Anyone have any opinions?
anarchyx34 is offline   Reply With Quote
Old 07-23-2008, 05:12 PM   #2
Miotta FTW!
iTrader: (24)
 
Splitime's Avatar
 
Join Date: Jun 2006
Location: Chicagoland, IL
Posts: 4,295
Total Cats: 26
Default

If it is the rb20det turbo... the ceramic bladed turbo... skip it. They fall apart at higher boost levels.
Splitime is offline   Reply With Quote
Old 07-23-2008, 06:00 PM   #3
Junior Member
Thread Starter
 
Join Date: Oct 2007
Location: Staten Island, NY
Posts: 159
Total Cats: 0
Default

nah it's from an RB26. He has both of them in fact, however I only need one.
anarchyx34 is offline   Reply With Quote
Old 07-23-2008, 06:28 PM   #4
Elite Member
iTrader: (39)
 
Zabac's Avatar
 
Join Date: Sep 2007
Location: High Point NC
Posts: 4,854
Total Cats: 8
Default

Go with the Saab if you think you will be happy at 150-180whp (maybe a bit more).
The T28 can make more power, with some lag, but it sounds like you would rather give up some power to have less lag.
On another note, cheaper can be better, this would be the case here.
Zabac is offline   Reply With Quote
Old 07-23-2008, 06:44 PM   #5
Junior Member
Thread Starter
 
Join Date: Oct 2007
Location: Staten Island, NY
Posts: 159
Total Cats: 0
Default

I'd rather have less lag. 180whp would have me giddy.

I also did some research and apparently a TD04 from a Saab 9-3 viggen or 9-5 Aero is a drop in upgrade from the T25. Some company also makes a 19T upgrade beyond that which sounds pretty badass. Worst case scenario, in a couple of years if I want to upgrade to a GT2560 or something, I have the downpipe redone. Not the end of the world.
anarchyx34 is offline   Reply With Quote
Old 07-23-2008, 06:55 PM   #6
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,202
Total Cats: 2,584
Default

id go for the t28 but im all for bigger power
18psi is offline   Reply With Quote
Old 07-23-2008, 08:23 PM   #7
Junior Member
iTrader: (2)
 
Join Date: Oct 2007
Location: Lisle, IL
Posts: 296
Total Cats: 0
Default

FWIW, the Saab T-25 turbo has a funky turbine housing (not the standard 5 bolt DSM/JDM "cover") that has an integral "ball" for a Saab downpipe with a cone fitting. ID on the ball fitting (part of the turbine housing casting) is only 2.25". Probably not a factor at lower power levels, but it is a restriction if you want a 2.5" downpipe and exhaust system.
sn95 is offline   Reply With Quote
Old 07-23-2008, 09:39 PM   #8
Junior Member
Thread Starter
 
Join Date: Oct 2007
Location: Staten Island, NY
Posts: 159
Total Cats: 0
Default

I already knew about the turbine housing, but I also just noticed, looking under the hood of my 9-3, that the compressor inlet is some fucked up v-band setup. Now this is getting complicated. I'm probably going to go with the T28 or pick up a used T25 from an SR20. Funny thing is that last year I had a T25 sitting in my garage collecting dust that I threw out because I figured I'd never need it. I'm such a ****.
anarchyx34 is offline   Reply With Quote
Old 07-23-2008, 09:45 PM   #9
Miotta FTW!
iTrader: (24)
 
Splitime's Avatar
 
Join Date: Jun 2006
Location: Chicagoland, IL
Posts: 4,295
Total Cats: 26
Default

Pics of the t28?

Maybe hook a miata brother up? I have an rb20 that I 'think' might be compatible with it...
Splitime is offline   Reply With Quote
Old 07-24-2008, 12:04 PM   #10
Junior Member
Thread Starter
 
Join Date: Oct 2007
Location: Staten Island, NY
Posts: 159
Total Cats: 0
Default

I'll have to go and take a look at them.
anarchyx34 is offline   Reply With Quote
Old 07-25-2008, 01:06 AM   #11
Junior Member
Thread Starter
 
Join Date: Oct 2007
Location: Staten Island, NY
Posts: 159
Total Cats: 0
Default

Ok so I bought a regular T25 from an SR20. I think this was the better choice. .64 a/r too which is nice for top end.
anarchyx34 is offline   Reply With Quote
Old 07-28-2008, 10:17 AM   #12
Junior Member
 
Join Date: Sep 2007
Location: Brisbane, Australia
Posts: 112
Total Cats: 0
Default

Quote:
Originally Posted by Splitime View Post
Pics of the t28?

Maybe hook a miata brother up? I have an rb20 that I 'think' might be compatible with it...
They are pretty small turbos, smaller than the stock one off an rb20 even. I have a couple of the ones of the r34 gtr one of which I should soon be putting on my mx5 on the homemade manifold I have built. They are the first of the gtr to get ball bearing, though they are quite tiny.

Some specs of gtr turbos http://homepage.ntlworld.com/tbroom/Turbos.htm
zoomzoom is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
The "other" spool question stefanst DIY Turbo Discussion 44 09-28-2015 08:16 PM
WTB 1.8 manifold and turbo (preferred ball bearing) AnotherDamnMiata WTB 13 09-11-2015 11:56 AM
My moving sale- I need this shit gone! RicanmiataRacer Miata parts for sale/trade 17 03-08-2007 04:36 PM
Im Looking for some info? RicanmiataRacer DIY Turbo Discussion 3 02-19-2007 06:52 PM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 09:37 PM.