Can I put a SR20 exhaust housing on a DSM t25 turbo? - 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 05-06-2007, 08:02 PM   #1
Senior Member
Thread Starter
 
Join Date: Jan 2007
Location: Maryland
Posts: 701
Total Cats: 0
Default Can I put a SR20 exhaust housing on a DSM t25 turbo?

Question...

Can I put a SR20 exhaust housing on a DSM t25 turbo? the .54 size appeals to me, and I have one but the turbo is pretty well and shot, but I know you can pick up DSM turbos for relatively cheap (actually pretty damn cheap) but I don't want to have to even think about redoing all of the manifold and downpipe work.

I know some of you on here will know something...perhaps most so Samnavy but just trying to figure it all out.
MX_Eva is offline   Reply With Quote
Old 05-06-2007, 08:05 PM   #2
Elite Member
iTrader: (9)
 
Join Date: Aug 2006
Location: Concord, North Carolina
Posts: 4,173
Total Cats: 5
Default

I know Sam did, but he had a lot of problems with his Fraken-turbo I think.
miatamania is offline   Reply With Quote
Old 05-06-2007, 08:32 PM   #3
Senior Member
Thread Starter
 
Join Date: Jan 2007
Location: Maryland
Posts: 701
Total Cats: 0
Default

looking at it, it seems that 14Bs ect use a clap system to hold the housings on where as the SR has the housings bolted on with a plate. would be interested in the issues and the results.
MX_Eva is offline   Reply With Quote
Old 05-06-2007, 08:38 PM   #4
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,860
Total Cats: 1,788
Default

as long as the turbines are the same size I dont see why not.
Braineack is offline   Reply With Quote
Old 05-06-2007, 09:23 PM   #5
Elite Member
iTrader: (7)
 
samnavy's Avatar
 
Join Date: Apr 2006
Location: VIRGINIA BEACH, VA
Posts: 6,020
Total Cats: 175
Default

I can't decipher what you currently have. What is your current setup? If I read correctly, you've got a DSM T25 on there that is ready to die... and you would like to replace it with a SR20det T25? Am I correct? In that case...

The AR of the turbines must be the same. The turbine on a DSM T25 is .49a/r, and the most common SR20det turbine is .64a/r. They will not match. I don't know of any T25 with a .54a/r turbine.

There are a couple stock applications in .49a/r that use the Standard T2 bolt pattern, which is how most of the Nissan turbo's come. I think the 300ZX single turbo of the late 80's had it, but don't quote me. If you're looking for a .64a/r exhaust housing with the DSM flanges to mate up to your current mani/dp, it doesn't exist.

The only way I can see you getting the benefits of the .80a/r compressor wheel on the common SR20det T25 is to rebuild your current turbo with that compressor. You'll need the compressor housing to go with it.

I think my Frankenturbo problems were due to having too many parts from too many different mileage turbos. I had a 200k mile turbine housing, a 50k mile CHRA, and a 100k mile rotating assembly. They were certainly out of spec enough with eachother that they simply wouldn't seal right on the hot side. I wouldn't think you'd have the problem sticking with the same hot section and simply swapping out the compressor wheel. Replacing a .48a/r (DSM) compressor wheel with a .80a/r wheel would totally screw up your flow and spool. I wonder if somebody has this combo graphed somewhere.
samnavy is offline   Reply With Quote
Old 05-06-2007, 09:38 PM   #6
Elite Member
iTrader: (13)
 
cjernigan's Avatar
 
Join Date: Oct 2006
Location: Atlanta, GA
Posts: 8,147
Total Cats: 6
Default

I swapped a pontiac sunbird turbine housing onto my nissan T25, works fine think it killed some of the spool but my downpipe is weird and wouldn't reach up the extra 1/4" to bolt up to the nissan turbine housing.

BTW, my downpipe is a POS, only reason why i couldn't use the Nissan housing.
cjernigan is offline   Reply With Quote
Old 05-07-2007, 12:44 AM   #7
Senior Member
Thread Starter
 
Join Date: Jan 2007
Location: Maryland
Posts: 701
Total Cats: 0
Default

Thanks for the info, which basically chalks up to it won't work.

To clarify I have a standard T25 manifold and downpipe, I have a sr20 t25 with a .80 a/r compressor that is shot, the turbo shaft is fine but the seals are all gone to hell so there's oil all on the inside.

What I was hoping to do was take the exhaust housing off the sr20 turbo and put it on a Mitsu Turbo so that I could keep the standard t25 exhaust ports (both in and out) and not have to rebuild the SR20 Turbo which would have bad spooling characteristics with the .80 A/R on the compressor side.

However, like I stated earlier apparently this will not work as the Turbine housings have different A/Rs. Actually I would suppose it would work if they had different A/R's as long as the wheel trim was the same, but I doubt it would be.
MX_Eva is offline   Reply With Quote
Old 05-07-2007, 05:10 AM   #8
Junior Member
iTrader: (1)
 
Join Date: Oct 2004
Location: Haarlem ,the Netherlands
Posts: 453
Total Cats: 0
Default

just rebuild it....

for swapping housings, a/r are not everything...the diameter of the exhaust wheel must be the same... thats why on a gt30 you can pick a/r ...
greddymx5 is offline   Reply With Quote
Old 05-07-2007, 09:09 AM   #9
Elite Member
iTrader: (7)
 
samnavy's Avatar
 
Join Date: Apr 2006
Location: VIRGINIA BEACH, VA
Posts: 6,020
Total Cats: 175
Default

samnavy is offline   Reply With Quote
Old 05-07-2007, 05:03 PM   #10
Senior Member
Thread Starter
 
Join Date: Jan 2007
Location: Maryland
Posts: 701
Total Cats: 0
Default

Well apparently if I had payed attention I would have realized that you have already done the very thing I was asking. Fancy that. Very nice write up on it all, what's you opinion of the housing mate up? Spool well, a bit late, etc.?

I think though that it'd be easier for me to just sell the one I have to someone who wants to rebuild it and keep looking. If I get a good deal on a nice sized t25 turbine housing though, I'll probably consider this again.
MX_Eva is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
91 1.6l turbo complete part out. Tony the Tiger Miata parts for sale/trade 63 12-29-2016 03:23 AM
elesjuan's mediocre 95 Miata adventure (google fiber edition) elesjuan Build Threads 8 02-16-2016 09:36 PM
Turbo 1995 Miata Low mileage Clean Tekel Cars for sale/trade 29 02-05-2016 05:16 PM
Dsm t25 big16g or somethig else? karcher DIY Turbo Discussion 0 09-06-2015 06:02 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 04:28 AM.