Can I put a SR20 exhaust housing on a DSM t25 turbo?
05-06-2007, 07:02 PM
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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.
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.
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05-06-2007, 07:32 PM
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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.
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05-06-2007, 08:23 PM
#5
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.
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.
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05-06-2007, 08:38 PM
#6
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.
BTW, my downpipe is a POS, only reason why i couldn't use the Nissan housing.
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05-06-2007, 11:44 PM
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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.
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.
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05-07-2007, 04:10 AM
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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 ...
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 ...
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05-07-2007, 08:09 AM
#9
This kit:
http://www.gpopshop.com/garrettt2kits.html
This thread:
https://www.miataturbo.net/forums/showthread.php?t=5164
Take your time.
http://www.gpopshop.com/garrettt2kits.html
This thread:
https://www.miataturbo.net/forums/showthread.php?t=5164
Take your time.
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05-07-2007, 04:03 PM
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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.
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.
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