gt2871r turbo elbow help

[HPballer76]

well i've been collecting parts for my turbo upgrade for a while now. i just got my last part in which is my turbo elbow and it dosent fit.. it is a divided elbow with screamer pipe. the problem is the divider part hits the little piece that is in between the exhaust and wastegate flapper (sorry don't know what its called). i can take the divider part off of the elbow but then i would have a huge exhaust leak? so any help or suggestions would be great? i was planning on pulling my motor and putting everything on next week.

here is a few pics to show what im talking about.


http://i187.photobucket.com/albums/x28/hpballer76/Photoon2010-01-14at2344.jpg
http://i187.photobucket.com/albums/x28/hpballer76/Photoon2010-01-14at2346.jpg
http://i187.photobucket.com/albums/x28/hpballer76/tn.jpg

[bl3ujay07]

I didn't know the gt2871r has the built in divider? i thought only the s15 has them because my gt2871r (.63) doesnt have it. Either way, remove the divider from the elbow. Isnt it just two bolts holding it down?

EDIT: Why would you have an exhaust leak? It will sit flat.

[HPballer76]

this one is the .64 t2 flange. and yes the divider is only 2 bolts and i can remove it easily but the built in divider on the turbo doesn't go all the way up? (look close and you can see it) there for without the divider on the elbow wouldn't i have an exhaust leak from the screamer pipe?

[HPballer76]

heres a crappy paint of what i am thinking. maybe im just tired so correct me if im wrong. (hopping i am)

http://i187.photobucket.com/albums/x28/hpballer76/Photoon2010-01-14at2346-1.jpg

edit. http://i187.photobucket.com/albums/x28/hpballer76/Photoon2010-01-14at2346-1-2.jpg


with the divider off of the elbow it would sit flat against all the red sections but the green is lower there for wouldn't it allow air to pass through to the screamer pipe side (blue arrow) giving me an exhaust leak?

[jspaeth]

heres a crappy paint of what i am thinking. maybe im just tired so correct me if im wrong. (hopping i am)

http://i187.photobucket.com/albums/x28/hpballer76/Photoon2010-01-14at2346-1.jpg

edit. http://i187.photobucket.com/albums/x28/hpballer76/Photoon2010-01-14at2346-1-2.jpg


with the divider off of the elbow it would sit flat against all the red sections but the green is lower there for wouldn't it allow air to pass through to the screamer pipe side (blue arrow) giving me an exhaust leak?

No. Many (like the stock one) turbo outlets do NOT have a divider in the outlet, and it's just fine.

Remember, the air is coming OUT of the turbine wheel, towards you, as you are looking at it in the picture.

So inside the housing, the flapper is shut, and all air goes through the turbine.

Until you hit full boost (well, almost), the wastegate is essentially shut anyway, so there is nowhere for the air to go.



What MAY happen, is that before hitting full boost, you may have some gases exiting the turbine and sneaking throught the gap (in green) and out the "screamer pipe", but this will have no real adverse effects, to be honest.

[S13 curtis]

damn so many 2871 threads they should make a GT2871r Tech section lol.

[HPballer76]

No. Many (like the stock one) turbo outlets do NOT have a divider in the outlet, and it's just fine.

Remember, the air is coming OUT of the turbine wheel, towards you, as you are looking at it in the picture.

So inside the housing, the flapper is shut, and all air goes through the turbine.

Until you hit full boost (well, almost), the wastegate is essentially shut anyway, so there is nowhere for the air to go.



What MAY happen, is that before hitting full boost, you may have some gases exiting the turbine and sneaking throught the gap (in green) and out the "screamer pipe", but this will have no real adverse effects, to be honest.

cool thanks man. thats what i needed to know.


if anyone else has opinions go ahead and post them up.

[traxx07]

I think that is a GT28rs (Stock S15 Spec R). Either way you should be fine just take that divider on the elbow off being as you have a divider on the turbo already.

[Killa_D]

naa theres some gt2871r that have a divider like the spec r turbo.

[4x4le]

My $0.02...... take it for what its worth.

The divider you have inside your exhaust housing is not going to stick out far enough for it to seal off. Even though exhaust is only coming out of the turbine most of the time there will be nothing (if you remove the divider on the o2 housing) to keep the gasses from exiting the screamer pipe. It will make the sound of an exhaust leak.

My old o2 housing was of a similar design only dumber, because it re introduced the wastegate air back into the exhaust, it had the divider which broke and could have very easially came into contact with the turbine. I will never run an o2 housing like that again. There really is no point anyways. Most of the time that pipe has trouble clearing the steering shaft on lhd cars too.

I suggest selling it off and getting an isis o2 housing. Mine has been great and there is tons of clearance for the steering shaft.

All of the trouble your o2 housing can cause you isnt worth the small amount of cool points you get when your exhaust gets louder when the wastegate opens.



side note: My 2871 .86 does not have the divider like your turbo either.

[HPballer76]

^^ that is what i was thinking..

and here is the part number on the turbo

472560-15


TurboByGarrett.com - Catalog (http://www.turbobygarrett.com/turbobygarrett/catelog/Turbochargers/GT28/GT2871R_472560_15.htm)

[codyace]

Stock .64 2871r
http://www.codyace.com/albums/album128/P1010034.sized.jpg

Stock .86 28RS
http://www.kawski.net/d/20526-3/DSC04202.jpg


No 28RS or 2871r should have that 'divider' in there. that really looks like a 28r or even T28 exhaust housing. Unless they have changed these recently...


In regard to the o2 pipe, I would simply remove that 'divider' and just leave it be. Obviously it's not 100%, but it's not wrong either. I think you'll be just fine, as I can't see 'seperation' really making any sort of 'super duper' difference (maybe a mph in trap? maybe 5 hp? who cares at that point).


Also, I'd suggest either running a OEM Z32 Turbine outlet gasket, stove cement or straight copper sillicone instead of that gasket between turbine housing and o2 housing that came with the kit...those shitty metallic paper ones always blow out.








Greddy for anyone that wonders: http://www.codyace.com/albums/album198/P1010038.sized.jpg

[HPballer76]

alright i may just do that ^^

and now im really wondering if i got screwed on this turbo.. cody if i post some more pics could you help me figure it out?

[jspaeth]

No 28RS or 2871r should have that 'divider' in there. that really looks like a 28r or even T28 exhaust housing. Unless they have changed these recently...



Cody, I bought a BRAND NEW GT2871R through Evans about 2.5 years ago, and I confirmed via the part number that it was the right turbo....

And the turbine side DID have the divider, just like the OP's.

I had to use a dremmel tool on my Greddy elbow to trim back the divider on that so it would bolt up.

I don't think I have a bootleg turbine housing....do I?

yikes!

[HPballer76]

^^ thats what im afraid of! but i matched up the part numbers and everything before i bought it.. someone help! ill go grab the cam and take pics from every possible angle! lol

[jspaeth]

^^ thats what im afraid of! but i matched up the part numbers and everything before i bought it.. someone help! ill go grab the cam and take pics from every possible angle! lol


Relax....it's fine! No internally gated setup has a fully airtight divider (whether it be on the elbow or on the housing itself) separating the turbine "side" from the wastegate "side".

The built in divider in the housing and on the Greddy elbow are meant to prevent massive turbulance and "guide" the flow

[HPballer76]

alright cool. i was going to sell the elbow but i think ill keep it and give it a try. i can pick up a bnib greddy for 100 from a friend though.. hmm

and to make me feel better heres a couple more pics of the turbo i have. someone tell me i have the real thing lol

http://i187.photobucket.com/albums/x28/hpballer76/DSC_0001.jpg
http://i187.photobucket.com/albums/x28/hpballer76/DSC_0005.jpg
http://i187.photobucket.com/albums/x28/hpballer76/DSC_0007.jpg

[codyace]

ah you have a much newer one, as it has the 'oe' style compressor housing on it.

I stand 'retarded' for forgetting this aspect...I'm so used to everyone having 3" inlets hehe.

[4x4le]

I see in no way how that inlet would be of a benefit than my 2871r with 3" inlet.... Is it still an option to get the old style ones? I would hate having an inlet like that.

[HPballer76]

yes as far as i know you can still get the 3 inch inlet which i would rather have but i got this for a price i couldn't refuse.

[codyace]

I see in no way how that inlet would be of a benefit than my 2871r with 3" inlet.... Is it still an option to get the old style ones? I would hate having an inlet like that.

I agree. It would be interesting to view the 2" inlet vs the 3" inlet in regard to power.

[jspaeth]

Cody....I think I have the 2" inlet style compressor housing.

I am wondering if maybe this is having an effect on my numbers...?

Also, I think I can buy from ATP the 3" inlet style housing.....would doing so affect my tune? I am debating in my mind if it would.....I think it would... haha

Anyway, not sure if I am gonna bother thinking about it.

[codyace]

Obviously the compressor maps are also o question, but I would ALWAYS side on the 3" inelet house, just because it provides a seemingly 'smooth' transition from filter, to maf, to turbo.

With that said however, I wouldn't go around changing stuff for that 10 hp on a dyno sheet if your setup works hehe.

[jspaeth]

Obviously the compressor maps are also o question, but I would ALWAYS side on the 3" inelet house, just because it provides a seemingly 'smooth' transition from filter, to maf, to turbo.

With that said however, I wouldn't go around changing stuff for that 10 hp on a dyno sheet if your setup works hehe.


I know what you mean, but I have a feeling that one of th reasons my setup is like 30-40 ft-lbs short of yours across the board is due to a lot of "little stuff" all adding up.

1) 2 inch inlet
2) Old filter that probably needs to be replaced
3) Need better timing in my map
4) Swained/extrude honed exhaust mani......(this interests me....even though we have the same intake manifolds and run the same boost, which you think would correspond to the same airflow to the manifold, maybe the EH exhaust side is allowing their to be less backpressure and thus "indirectly" allowing more air to flow into the engine on each stroke).
5) Intercooler piping that is SEALED (no leaks), but could be better (in some places, I have one piece of pipe "inside" the other, bc the one may be too long, etc).

6) Wondering if somewhereI have a small boost leak (I should check the injector grommets....I think you mentioned you were having an issue with these.


Basically, I would really love to know that I am getting the MOST out of this setup that I can.