modifying a turbo

[DjLiquid]

I recently purchased a T28 for a really good deal. I bought it knewing that it needs work. The exhaust housing has a crack in it right at the wastegate. I did some research on it and after comparing pictures on the net, I finally found out what I had bought. A Garrett TB2804. Here's the specs:

Part#: 465997-0001Turbo Part Number: 14411-54C00Description: Std T25 ConfigModel: TB2804Compressor HousingDiameter: 60Trim: 60 A/R: .60Turbo HousingDiameter: 53Trim: 79A/R: 0.86MSRP: $1,102.10

....Now, I was told that it's more than likely possible to swap my CA T25 exhaust housing with this but the sizes seem quite different. Here are the specs of our T25's:

Part#: 466073-0008Description: Std T25 ConfigModel: TB2209Compressor HousingDiameter: 51Trim: 60 A/R: .48Turbo HousingDiameter: 47Trim: 69A/R: 0.69MSRP: $964.34

Now, if I were to swap housings, how much of a power loss would we be talking about? Also, I would assume that I would have to purchase both a T25 and T28 rebuild kit? Also, is there any other turbo out there that uses a .86 or .64 turbo housing that I can swap with? Also, right from the garrett website:http://www.turbobygarrett.com/...1.htmIt says there was an option if you wanted the .64 or .86 housing.

Any insight on this matter would be a great help.

Thanks!

Modified by DjLiquid at 1:11 PM 5/10/2006
Modified by DjLiquid at 1:14 PM 5/10/2006

[DjLiquid]

After more research it seems like these turbo's come with either a .64 or .86 housing:TB2804 = .86GT2860RLS = .64GT2554RLS = .64GT2576RLS = .64GT2860RLS = .86

With this information available to us, I guess I would either have to find one of those following turbos (blown of course) to swap the turbo housing. Since that will be a feat in itself, how would I go about using any other turbo housing and modifying it to fit?
Modified by DjLiquid at 1:36 PM 5/10/2006

[float_6969]

For the CA, I'd reccommend the .64 turbine housing. The .86 would be pretty laggy...

[DjLiquid]

If I were to take off the .64 turbo housing from my T25, would I need to modify anything or would it bolt up without any problems?

Also, Ive been reading around that this turbo I have is a ball bearing turbo and bb turbo's are not rebuildable. On another note, this turbo I bought was already rebuilt once before so Im confused about what I truly have. Is there any way to tell without taking it all apart?

[DjLiquid]

here's a pic of it

[float_6969]

More pics. Preferabally the turbine housing.

[DjLiquid]

here you go

[knightrider]

your stock housing is too small to machine to work with that wheel. i would run it how it is, it will have more lag than your stock turbo, but try it out. in the mean time, contact garrett and see if a suitable .64 housing is available for that wheel.

by the specs that you posted, the wheels are the almost the same as a GT28RS, the disco potato has a little milder trim for less lag, but should be ok that turbo is prolly good for around 350-375hp
Modified by knightrider at 7:24 PM 5/10/2006

[DjLiquid]

I understand what you're getting at but I think you totally missed the point of my post. The turbo housing on this turbo is shot so I want to know what I can replace it with

[knightrider]

sorry, i was eating and reading, i missed some of the info. well im not sure of the extent of the damage, but you might try getting the cracks welded, that all depends on how bad it is.

i can tell you it takes a long time to get a housing from garrett, we are a garrett dealer and it takes us a couple months to get housings if your lucky. thats for current turbos.

this turbo you have is according to your part number is a GTI-R turbo, your best bet is trying to repair the housing, i could also look around the shop, we might have some gti-r housings, but i dont promise anything
Modified by knightrider at 11:09 PM 5/10/2006

[mbmbmb23]

Sounds like a GTIR turbo with an S14 compressor housing. You sure it's BB? If so keep the .86 A/R if you have the stage 3 ECU and mods to support it.

-m

[datsunboy]

GTiR turbo's are the same as the S14 turbo's, except they have the 0.86 turbine housing.

It looks EXACTLY the same as my GTiR turbo that I put on my CA.if it is....then no, they arent ball bearing

[dash]

lots of cars running around out there with cracks around the wastegate flapper hole. Depends on how bad it is really. Seen a couple useless 0.86s tho.Or try the se-r forum for a 0.86 gti-r housing... common turbo for their conversionshttp://sr20deforum.com/forumdi...&f=12

Rather than 'rigging' a t28, my vote for a stock cammed ca18 bolt-on turbo, is to have a dead sr20 T25 upgraded to a 'big28' by forcedperformance.net. New center fitted to your machined housings $599.... tough li'l turbo thats put own solid numbers

[DjLiquid]

wow... Thanks for all the input guys =). It's really appreciated. I think Im just going to use the cracked manifold and just weld it. Hopefully that will work well

[mbmbmb23]

GTiR turbo's are the same as the S14 turbo's, except they have the 0.86 turbine housing.

It looks EXACTLY the same as my GTiR turbo that I put on my CA.if it is....then no, they arent ball bearing

S14 turbos have TO4B compressors........RNN14 GTIR's have T3 V60 compressor or something slightly less efficient........there was a thread on one of these forums awhile ago (FA maybe) talking about the hybrid of both......I think 320-330 hp was the number....on an SR tho.

-m