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Old 04-08-2011, 04:34 PM   #1
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Default Normal vs. Divided Turbine Housings Discussion

There has been some discussion about the possible benefits of using divided turbine housings lately and I wanted to dedicate a thread to the topic for the ease of future searching. I have been reading about them lately and wanted to share a bit.

Please add your own sources of information on the subject as you encounter them.


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I knew the divided housings provided better spool, but didn't realize there was a penalty on the top end due to additional drag from increased surface area. I wonder if our little engines could push enough exhaust volume for the high end restriction to even be a problem?




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I also didn't realize the two inlets were introduced 180* out from each other inside the housing.




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This says that it helps to reduce cylinder to cylinder pulse interference. I was thinking that this would be more important on an engine that had six or more cylinders than one with just four, but that at higher RPMs it would easily be conceivable that the pulses from one and four would be heading straight toward each other in a log type manifold and meet somewhere in the middle. Obviously this would be less of a problem when using a tubular merging-type collector, and no one would use a log with a divided turbine housing.

Thoughts? Additions?
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Old 04-08-2011, 05:28 PM   #2
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I'm here for the turbulent, high-speed, twin entry.
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Old 04-08-2011, 05:47 PM   #3
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If there's a penalty with high RPM use, but a significant gain in low RPM use, one could simply overcome the high RPM use penalty with a slightly larger turbocharger?

This might make the boost threshold/low RPM spool equal (no advantage for either) and at high rpm, the twin scroll would produce more power?
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Old 04-08-2011, 06:13 PM   #4
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in for info even though i have a log manifold.
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Old 04-08-2011, 06:41 PM   #5
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i highly doubt twinscrolls are going to outperform a single scroll turbo with tial v-band housing and the same chra and compressor, however ima stick around and learn something new.
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Old 04-08-2011, 07:18 PM   #6
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Quote:
Originally Posted by 1slowna View Post
i highly doubt twinscrolls are going to outperform a single scroll turbo with tial v-band housing and the same chra and compressor, however ima stick around and learn something new.
People that get paid LOTS of money (to conduct tests to find out what works) disagree with you.
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Old 04-08-2011, 07:48 PM   #7
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I like these things. Not enough to go buy one, but someday maybe.
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Old 04-08-2011, 08:02 PM   #8
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*****.

I am buying a motherfucking new turbo with a .888 undivided housing. I am also going to buy a .91 divided housing. I will log them bitches so hard that that that I will have spool statistics and other things. The divided housing will be for a quick spool valve, assuming I can find one for something less that a ridiculous price.
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Old 04-08-2011, 08:22 PM   #9
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Quote:
Originally Posted by Faeflora View Post
*****.

I am buying a motherfucking new turbo with a .888 undivided housing. I am also going to buy a .91 divided housing. I will log them bitches so hard that that that I will have spool statistics and other things. The divided housing will be for a quick spool valve, assuming I can find one for something less that a ridiculous price.
I bet you won't.
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Old 04-08-2011, 08:30 PM   #10
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Quote:
Originally Posted by fooger03 View Post
I bet you won't.
Nyah I bet I will

And bytw I am only talkign about sound performance QSVs.

I already found one for $200 but it had already been sold. sniff
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Old 04-08-2011, 09:37 PM   #11
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Quote:
Originally Posted by Faeflora View Post
Nyah I bet I will
<Interested in the results.
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Old 04-28-2011, 07:43 PM   #12
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I am working on an interesting project with turbo by Garrett with a twin scroll set up. Should be pretty awesome. I will post when it is finished. Looking to be around 450rwhp 400ftlbs..
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Old 04-28-2011, 09:29 PM   #13
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Quote:
Originally Posted by hustler View Post
I'm here for the turbulent, high-speed, twin entry.
DP anyone?
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Old 04-28-2011, 09:40 PM   #14
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I'm getting my T4 twin scroll manifold built now, I will keep everyone updated.
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Old 04-28-2011, 11:17 PM   #15
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Quote:
Originally Posted by 1slowna View Post
i highly doubt twinscrolls are going to outperform a single scroll turbo with tial v-band housing and the same chra and compressor, however ima stick around and learn something new.
This is such ******* bullshit. Go **** yourself.


Quote:
Originally Posted by fooger03 View Post
I bet you won't.

I did. The turbo is in the car right now. Sitting in the passenger's seat. Quick spool valve is on the way. It will spank the **** out of lag. .45 A/R for the spool win.


Quote:
Originally Posted by TURNS101 View Post
I am working on an interesting project with turbo by Garrett with a twin scroll set up. Should be pretty awesome. I will post when it is finished. Looking to be around 450rwhp 400ftlbs..
Moar details? What turbo? What car/engine?
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Old 04-28-2011, 11:27 PM   #16
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Quote:
Originally Posted by fooger03 View Post
If there's a penalty with high RPM use, but a significant gain in low RPM use, one could simply overcome the high RPM use penalty with a slightly larger turbocharger?

This might make the boost threshold/low RPM spool equal (no advantage for either) and at high rpm, the twin scroll would produce more power?
Isn't that what everybody does anyway?

The first example in the OP assumes that one isn't simply using a larger twin scroll than the single scroll they would otherwise use, and assumes that the reader gives a flying **** about static, industrial applications.
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Old 04-29-2011, 02:50 AM   #17
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I guess il go **** myself since i have seen, in person more cars making bigger numbers with single scroll turbos? i said i was here to learn somehting new, stop being such a ******* ********.

for the record i hope it works fantastic, i would love to see miata with a nice twinscroll setup making good power. There is no reason i cannot b optimistic though.
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Old 04-29-2011, 05:14 AM   #18
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Quote:
Originally Posted by 1slowna View Post
i have seen, in person more cars with single scroll turbos.
ftfy, and cool story bro.
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Old 04-29-2011, 10:04 AM   #19
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Quote:
Originally Posted by 1slowna View Post
I guess il go **** myself since i have seen, in person more cars making bigger numbers with single scroll turbos? i said i was here to learn somehting new, stop being such a ******* ********.

for the record i hope it works fantastic, i would love to see miata with a nice twinscroll setup making good power. There is no reason i cannot b optimistic though.
Snuggles.


Causation does not necessarily equal correlation.
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Old 04-29-2011, 11:14 AM   #20
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Quote:
Originally Posted by Faeflora View Post
Causation does not necessarily equal correlation.
Or something like that.
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