t4 flange

[Stew Pidaso]

Hey I just got an HX40 from a guy of mine near me but it has the t4 divided flange and the manifold I have is a t4 but not divided. I just have 2 quick questions for what I can do.

1)I read on an rx7 forum that you can bolt an undivided manifold to divided turbo. Just wondering if anyone could add some support to that?

2) Should I get a divided or undivided gasket for this application or would it matter?

Thanks guys

 

[KewlWinter]

You can run that setup, but... You may introduce a little turbulence when the exhaust flow hits that divider. As to the gasket, you dont want any gasket surface inside that manifold that isnt sandwiched. The gasket material in the divided gasket that runs across that divider could actually break off and go through your turbo blades, so go with the undivided gasket.

 

[xxNocturnalxx]

^ Like stated, undivided gasket. I do wonder tho if you could knife edge the center piece to help with proper flow

 

[KewlWinter]

I would definitely narrow out the divider, but not to knife edge. If that knife-edge gets red hot, any internal material defects (like voids) might cause spalling, with the spalled material going thru your turbo.

 

[Stew Pidaso]

Yeah I was thinking ab taking it to a machine shop to get it opened up more so I can know its done right. Also does anyone know about the v-band clamp that hooks up to these. Like where to find? Just wondering if anyone would know
Edit: When I say open it up more I mean like the ports themselves because theyre not the right size (With gasket on you could see some of the port wall still) May be able to take a pic and have it up tomorrow.

Can you guys see what I'm talking about when I'm saying opening up??

 

[Stew Pidaso]

Also was wondering which would be stronger. To narrow the divider or to knife edge

 

[JusMX141]

You could gasket-match it around the perimeter. Concerning the knife-edge:

I'm sure I already mentioned to radius the divider. Knife-edging doesn't help flow as much an takes more time to do.

Knife-edging encourages eddies after the flow division: the principle used by the karmen vortex mass flow sensor us mitsu guys have. Airflow can't actually curl around except at VERY high velocity, but it does cause more scrubbing on the inside surface of the housing on the divider; which is a loss. And as well at different velocities, you'll see DRASTICALLY different scrubbing losses on one side or the other. Since airflow likes to travel the path of least resistance, this makes the aiflow quite unstable across the division and overall flow is reduced.

 

[Stew Pidaso]

Ok so knife edging is no good for flow. But, Justin, would removing that excess metal in the ports increase the flow to the turbine? Or if I took your advice and gastket-matched what would that yield, flow wise?

 

[crazyquik22023]

I am actually using a divided manifold with an undivided turbine housing. I have used this setup with an undivided gasket for years with no problems or leaks. I also notice you live in canton. Let me know if you need any help

 

[Stew Pidaso]

Haha alright thanks bud! what manifold are you using btw

 

[crazyquik22023]

DNP T4 divided

 

[Stew Pidaso]

I was planning on buying that from extremepsi but does that come divided then because it doesnt specify unless im missing something here..

 

[JusMX141]

Ok so knife edging is no good for flow. But, Justin, would removing that excess metal in the ports increase the flow to the turbine? Or if I took your advice and gastket-matched what would that yield, flow wise?

According to what Matt said in the quote I linked above, apparently knife-edging won't help you regardless. I would gasket-match just to gain some critical flow and smooth out the transition between the manifold and turbine housing. Maybe "D"-shape the scrolls a bit to the center, but leave the divider alone...like this example:

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Also, the picture you've linked above is a T3 flange....this is a T4.

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[Stew Pidaso]

Are you 100% sure about that being a t3? Not trying to insult your intelligence in the field but I did the measurements to be sure

 

[JusMX141]

T3:

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T4:

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Without a doubt, yours is a T3.

 

[Stew Pidaso]

Would you like me to post a pic of tape measure? I can see where you would think its a t3 because of that pic... The turbo is sitting on a mound of magazines and is kind of on a lean so thats why the dimensions are thrown a bit

 

[bryanwheat]

Would you like me to post a pic of tape measure? I can see where you would think its a t3 because of that pic... The turbo is sitting on a mound of magazines and is kind of on a lean so thats why the dimensions are thrown a bit

The turbo in the pic is pretty clearly a t3 flange.

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[Stew Pidaso]

alright now i feel like a jackass. I miss-read the pic length wise but i measured it width wise and its dead on 4.25" also not helping that im tired as shit but sorry guys my mistake