compound turbine housing sizing - Competition Diesel.Com

camccardell · 03-28-2017, 04:17 PM

This is a question I cannot seem to get a good answer on, so I figured I'd throw it out there and hopefully someone with a lot more knowledge than me can help me on this.

Trying to determine what size exhaust housing for my atmospheric turbo setup on my 4bt.

The hx30 up top is a 6cm

But the bottom turbo is an s256. .70 AR T3
I am concerned that it is too small. Before I build all the parts for it, I want to be on the right path.
I was thinking I need something bigger, but I don't have many options.
I can get a 1.0 or a 1.12 or 1.22 in a t4
I also believe there is a .82 in a t3 and t4

What is the difference? I mean is it just the flange size since the turbine wheel is the same regardless or is there more to it?

I had an he341 under it before, and it was choking pretty bad with the 9cm housing.
Was debating an 12 or 14 hx35, but decided to go with the BW turbo as it flows more.

Any info on this would be greatly appreciated.

Thanks!

mfsuper90 · 03-28-2017, 05:43 PM

I dont know enough about compounds to help, but I have a 1.0 T3 housing for a s256. So if that ends up being something you might need, shoot me a PM.

Im sure someone will be able to help you out.

camccardell · 04-11-2017, 05:20 PM

nobody has this tech down?

badbowtie · 04-11-2017, 08:49 PM

I can't help you size your housings but that AR number is basically a volume measure. A .7 housing is small a 1.0 is bigger. A bigger housing will flow more on the top end but will spool slower on the bottom.

Sent from my SAMSUNG-SM-G900A using Tapatalk

allan5oh · 04-12-2017, 11:21 AM

Quote:

Originally Posted by camccardell

nobody has this tech down?

I think the focus should be more on the compressor maps. Also wastegate sizing is critical. I have no experience with compounds however do know a couple guys that run them on large diesels.

camccardell · 04-12-2017, 04:33 PM

It matters because I am trying to see understand at what point am I choking the engine and at what point am I wasting energy?

03-28-2017, 04:17 PM	#1
camccardell Name: camccardell Title: Diesel Enthusiast Status: Not Here Join Date: Feb 2011 Member`s Gallery Posts: 234	compound turbine housing sizing This is a question I cannot seem to get a good answer on, so I figured I'd throw it out there and hopefully someone with a lot more knowledge than me can help me on this. Trying to determine what size exhaust housing for my atmospheric turbo setup on my 4bt. The hx30 up top is a 6cm But the bottom turbo is an s256. .70 AR T3 I am concerned that it is too small. Before I build all the parts for it, I want to be on the right path. I was thinking I need something bigger, but I don't have many options. I can get a 1.0 or a 1.12 or 1.22 in a t4 I also believe there is a .82 in a t3 and t4 What is the difference? I mean is it just the flange size since the turbine wheel is the same regardless or is there more to it? I had an he341 under it before, and it was choking pretty bad with the 9cm housing. Was debating an 12 or 14 hx35, but decided to go with the BW turbo as it flows more. Any info on this would be greatly appreciated. Thanks! __________________ 1995 f-150 3.9 VE 4bt, hx30 over HE341, 5 x .012 bosch tips, Colt stage 2 cam grind, 4" mandrel exhaust all the way back, 3" mandrel IC piping with 06 RAM IC

03-28-2017, 05:43 PM	#2
mfsuper90 Name: mfsuper90 Title: 300ft is all I need Status: Not Here Join Date: Feb 2013 Location: Southeast ohio Member`s Gallery Posts: 769	I dont know enough about compounds to help, but I have a 1.0 T3 housing for a s256. So if that ends up being something you might need, shoot me a PM. Im sure someone will be able to help you out. __________________ ’82 300D benz Bosch MW turned up, HX30, W/A Intercooler MF Super 90 various odds and ends done. Farm stocker MF 98 3-71 screaming jimmy. Needs N90's. Another farm stock '14 Ram Anarchy EFI, G56

04-11-2017, 05:20 PM	#3
camccardell Name: camccardell Title: Diesel Enthusiast Status: Not Here Join Date: Feb 2011 Member`s Gallery Posts: 234	nobody has this tech down? __________________ 1995 f-150 3.9 VE 4bt, hx30 over HE341, 5 x .012 bosch tips, Colt stage 2 cam grind, 4" mandrel exhaust all the way back, 3" mandrel IC piping with 06 RAM IC

04-11-2017, 08:49 PM	#4
badbowtie Name: badbowtie Title: custom engine daydreamer Status: Not Here Join Date: Apr 2008 Location: Plainfield IN Member`s Gallery Posts: 475	I can't help you size your housings but that AR number is basically a volume measure. A .7 housing is small a 1.0 is bigger. A bigger housing will flow more on the top end but will spool slower on the bottom. Sent from my SAMSUNG-SM-G900A using Tapatalk __________________ 1996 3500 4x4 5spd 1991 D350 5spd

04-12-2017, 04:33 PM	#6
camccardell Name: camccardell Title: Diesel Enthusiast Status: Not Here Join Date: Feb 2011 Member`s Gallery Posts: 234	It matters because I am trying to see understand at what point am I choking the engine and at what point am I wasting energy? __________________ 1995 f-150 3.9 VE 4bt, hx30 over HE341, 5 x .012 bosch tips, Colt stage 2 cam grind, 4" mandrel exhaust all the way back, 3" mandrel IC piping with 06 RAM IC