Q's about Evo 9 and 8 Stock Turbo
 

Sup guys, Buddy of mine and i are trying to do a project on our SRT-4's by running some Evo turbos on our stage 3 manifolds. Its been done with an Evo 8 turbo but were gonna be trying something new by trying to run the Evo 9 turbo.

My Q's are:

Does the 8 and the 9 both share the same turbine wheel size as far as the inducer and exducer? Im aware of the bigger exhaust housing 9.8 vs 10.5 thats not what i want to know.

Also is the exhaust flange on the CHRA(Piece that hooks up to the exhaust housing then with the turbo clamp) the same size as the Evo 8?

Im also aware that the Evo 9 compressor housing is much bigger hence the reason why we want to run it.

Thanks!

03s and 04s have the 9.8 with the small comp housing.
05s have the 10.5 also with small comp housing
06s still have the same CHRAs as all prior usdm models with the 10.5 and larger comp housing.

all flanges and threads are housing the same just a different coolant line bolted to the comp housing and a different outlet on the housing has a lil different angle aswell so it doesnt go into the starter if put on a earlier model.

I think this is more then you needed but wanted to be clear with everything

Ok but to get the most important thing straight, The CHRA exhaust side flange are exactly the same? For example you can take the 9.8 housing of an Evo 8 and mount it to a Evo 9 turbo? Im sure know one want to do it but itll give me the answer im looking for. Thanks for the great Info!{thumbup}

Yes you can take the 9.8 and 10.5 hotsides and interchange them. This is very common on the 03-04 turbos, to put the 10.5 hotside on them. As far as saying no one would put the smaller hotside on, actually if you put a ported 9.8 hotside on say a green it will spool stupid fast but will lose some on the top end. If you are putting these on say an SRT4 2.4 which doesn't rev as high it would not be as much of a loss at say a 6800 rpm redline and the faster spool would more than make up for the slight loss at that rpm. Also there are a few rare 9.0 hotsides around somewhere. Good luck finding one though! They would spool even faster!

Josh
:usflag:

I am ot sure that this is an answer to your question, but here it goes: There are three different turbine housing sizes for the MHI 16G turbos. These are the 9.8, the 10.5, and the 9.0 housings. These housings are interchangeable between both the IX and the VIII turbos.

You can take a 9.8 housing from an 16G VIII turbo and swap it directly onto a IX turbo. Vice versa, you can take a 10.5 turbine housing from a 16G IX turbo and swap it onto an VIII turbo.

There are some subvariant 10.5's. The first 10.5's had a dual flapper WG puck, while the later ones were configured with a single puck WG. I think that all of the 9.8 & 9.0 housings were dual puck. But, correct me if I am wrong. At any rate, as long as we are going with a stock turbine wheel, all of the stock housing sizes are interchangeable between IX & VIII 16G turbos.

Alright perfect, Thats exactly what i wanted to hear. I dont care to much about the housings aslong as the CHRA exhaust flange is the same size as an 8 it'll bolt up straight to our stage 3 manifolds.

Thanks guys!{thumbup}

What exactly do you mean by, "CHRA exhaust side flange"?

The turbine housing/CHRA fitment is via a circumferential machined groove and lip. At any rate any of the three basic housing sizes will mateup perfectly with the CHRA on the hotside.

EDIT: And all three above mentioned exhaust housings have the same identical turbine inlet flange footprint which mates to the cast factory exhaust manifold outlet flange. All use the same gasket at this juncture as well.

Ill make this simple... Yes, They all have the same flanges

stupid question....could you unbolt your VIII turbo and bolt on a IX turbo and be good...i know you'd have to retune but thiers no fabrication is there?

yes

no such thing as a stu. . . ah never mind! Yes the IX turbo will go on an VIII however you need the IX turbo outlet pipe so it doesn't hit the starter. The other lines (oil and coolant) should be replaced with the IX specific items but the VIII can be made to work. And yes you will need a retune to get the most benefit out of it.

Josh
:usflag:

speaking of getting a retune! What's up? LOL can you squeeze me in before xmas? LOL I still need to email you my current Map so we can get the latencies figured out.

Josh
:usflag:

Exactly what i ment to say. Since all of them use the same chra then the 9 will bolt straight on. So i got my answer, Thanks again for the help guys!

I have a 10.5 dual WG puck and I installed it on my stock IX turbine (TD05HR-16G6C-10.5T). It seems there is good spool 19,5+ psi @ 3000 and pretty stable boost with 23+ @7500 and 25,5 spike (EBC=AVC-R) but I would like to know what kind housing it is (from which evo) because the twin flapp mechanism does not look like this of an evo VIII and/or VI

http://homepage2.nifty.com/lancer/wg1.jpg

On my housing the flapps are hold not centrally but by an axis at two points. I searched a lot and found nothing.

I would also like to ask, if there is a difference at the turbo boost behaviour of a stock IX with single or twin puck housing, I mean was it maybe a mistake to install this housing or should I search for a stock single flapper?

Just to clarify this point, the IX CHRA is not exactly the same, the compressor side backplate is larger. I.E. you cannot swap compressor housings between VIII and IX turbos.