Turbo Make-over

[Dzaster]

Alright, nothing special just that it was my first time doing this. Rebuilt, minor port and polish and just flat out cleaned it up.

Here it is all cleaned, polished, and painted.
http://i525.photobucket.com/albums/cc340/dzaster96799/Turbo%20Rebuild/IMG_2338.jpg


Here's where I mild ported & polished the exhaust in. Just a clean up of the sort.
http://i525.photobucket.com/albums/cc340/dzaster96799/Turbo%20Rebuild/IMG_2311.jpg



Exhaust Housing:

Before
http://i525.photobucket.com/albums/cc340/dzaster96799/Turbo%20Rebuild/BeforePP.jpg

After
http://i525.photobucket.com/albums/cc340/dzaster96799/Turbo%20Rebuild/IMG_2302.jpg


This is what the housing looked like before worked on.
http://i525.photobucket.com/albums/cc340/dzaster96799/Turbo%20Rebuild/IMG_2312.jpg

And what I used to paint the rotation assembly and exhaust housings.
http://i525.photobucket.com/albums/cc340/dzaster96799/Turbo%20Rebuild/IMG_2355.jpg



Turbo Before:
http://i525.photobucket.com/albums/cc340/dzaster96799/Turbo/IMG_1118.jpg


After:
http://i525.photobucket.com/albums/cc340/dzaster96799/Turbo%20Rebuild/IMG_2342.jpg
http://i525.photobucket.com/albums/cc340/dzaster96799/Turbo%20Rebuild/IMG_2343.jpg
http://i525.photobucket.com/albums/cc340/dzaster96799/Turbo%20Rebuild/IMG_2354.jpg
http://i525.photobucket.com/albums/cc340/dzaster96799/Turbo%20Rebuild/IMG_2344.jpg

THIS (http://zilvia.net/f/tech-talk/188356-t25-turbo-rebuild.html) is the write-up for the rebuild I used.

Anybody done this type of thing? I'm wondering if I should port the compressor in. I've seen it said that any type of port and polishing on the T25 is futile. I mainly did it for the experience, but if it performs then bonus. I'm thinking bore/port this out along with inlet that mates to it. As large as the red area.
http://i525.photobucket.com/albums/cc340/dzaster96799/Turbo%20Rebuild/Portcompressor.jpg

[bluesnowgt]

awesome work! cant wait till i even have a turbo just to do that! lol looks great, and any polishing to anything will improve performance.

[Kennymp3]

Man thats a shiny turbo you have there D.
Im going to send you my spare turbo, so you can "practice"
your turbo rebuilding skill's.......lol
Anyway killer job on that piece.

[Dzaster]

Thanks guys. I know folks can achieve a better shine and perhaps I could've as well. I just chose to use what I had and also only what I could get here. It's enought for my taste.

Kenny, yes send yours to me, it mayget lost in the mail on the way back though.:D

[Accord2nrz]

Looks great man, keep up the great work.

[elderc]

Looks great, has your turbine been "clipped" ?

[Dzaster]

No it hasn't. At least I didn't do it if it has been.:D

[elderc]

Ok, in the picture of your turbine it looks like its been "clipped" cause the edges are not squared off ( could just be my eyes), just wanted to know because I was thinking of doing it to mine. ( I need more up top)

[bluesnowgt]

wats "clipped" mean? wat are the advantages of this?

[elderc]

"Clipped" is when you take 1-10 degrees off of your turbine to give you more flow in the upper rpm. range

[bluesnowgt]

bad pic, its too small.




...thats not wat she said....

[elderc]

Then do a search for yourself and find a better picture google "clipped turbine"

[Dzaster]

http://www.boostplanet.com/clip_noclip.JPG

The problem I see with that is having it balanced. I'd have to send it out to have it balanced.

Does it hurt spool any?

[elderc]

Yes, it slows down spoil based on the amount of material removed but the trade off is you can flow (depending on you motor of course) 30-40 hp more on the top end. it makes a T-25 flow like a T-28 turbine. I'am willing to trade off a few hundred rpm's because my small T-25 is in the chock zone @ 219whp........................ And I'am to cheap to upgrade LOL.

[Dzaster]

Cool, so you've done it? I see there is a place that'll do it and balance for $99. Not bad. Might consider it on the next one I'm rebuilding.

Oh, and I checked you're garage. So your SAAB T25 is topping out at 10psi? My understanding is that the Nissan's T25 is efficient up to 14psi. I'll hit 12max. Just not sure I want to really go anymore on this ASI motor. Still a viable solution if wanting to squeeze a little more out of this turbo. Thanks for that.

[elderc]

No, I have'nt done it yet but it seems like a cheap way to squeeze out a few more hp's, my T-25 could push 12 psi but I would be outside the 60% heat range which = "piston melting" not good, I'll let you know when I have it done and redyno the results.

[Dzaster]

I just found how to get the aluminum a bit more shine. Wire polishing wheel for the dremel. It a whole notch shinier.

[tersplat]

don I may be wrong but I thing porting the exhaust housing is going to allow for more exhaust to pass around the wheel but not actually spin it more, causing a loss of boost/spool time/ power the works, but i may be wrong, just my hypothesis.

[Dzaster]

Nah, you/I don't touch anywhere adjacent to the turbine blades--unless you were making room for a new wheel. I'll leave that for the pros. On the exhaust side I just smoothed everything out kinda like I would the combustion chamber on the head.

I had to do some massive porting of the turbo exhaust in side. When I put the gasket to it, man the turbo's exhaust inlet was a bit smaller so it had a decent step. Fixed that. Also, I did some mega cleaning up on the turbo flange on the manifold. Because I had to reweld the turbo flange back on the manifold, it also had a step on two of the runners closest the engine. I ground it out some so there was no step. I think these last things will be more significant than what I did with the turbo.

Also, after putting the turbo in the car, I decided that this is probably the last time I polish the a compressor housing, unless it sits top mounted. I have some pics to put up and will do so later.

[CG10DET]

Tersplat, you're right about that, but it also has the same effect as clipping, if more gasses can flow past the turbine wheel, at high speeds it willbe less of a restriction.

Porting the wastegate hole a bit can help stop boost spikes or creep if you suffer.

[Dzaster]

I haven't seen any creeping or spikes. I think the HKS actuator helps minimize that. However, I ported that wastegate as well, just for kicks.

I was going to port the compressor inlet, but I opted not to as I was told that it might change the characteristics of the turbo a bit--perhaps not for the better. So I stayed away from it.

[sventhemac]

Man thats cool stuff. Depends on how long my twins last I might try that out.

[Giff]

Thats very nice work, how's the paint holding up?

[Dzaster]

It is THEE BEST DIY paint I have used and I've used a few. This one has the curing process of heating, cooling, heating, cooling, etc etc. How it looks today with prolly around 400 miles on it. Took this pic real recently. All other's began to flake within the first day of use. This is now around 2 weeks.
http://i525.photobucket.com/albums/cc340/dzaster96799/Turbo%20Rebuild/IMG_1374.jpg

It is a very legit paint. Also, it is a satin/flat/matte(?) black so it looked flat from the start. Once cured it was hard to scrape clean paint off the exhaust flange on the turbo. I just left it.:D

100% recommend.