# divided and undivided turbine housings.....
**URL:** https://forums.speedlife.net/t/divided-and-undivided-turbine-housings/4173
**Category:** NYSpeed Automotive
**Created:** [November 3, 2005, 5:18pm UTC](https://forums.speedlife.net/t/divided-and-undivided-turbine-housings/4173 "2005-11-03T17:18:21Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@Adictd2b00st](https://forums.speedlife.net/u/Adictd2b00st)
#### Post date: [November 3, 2005, 5:18pm UTC](https://forums.speedlife.net/t/divided-and-undivided-turbine-housings/4173/1 "2005-11-03T17:18:21Z")
ok, i’ve asked around a bunch about this already, and haven’t really got anymore. take this example:
i buy turbo with undivided housing. manifold is made for turbo. i change my mind and buy a different turbo, which is a divided housing.
will a divided housing turbo work on a NONdivided manifold? i’ve been told it won’t matter at all, and i’ve been told it is completely necessary to match them. sooooo yea i’m still confused.
another thing to keep in mind… a rotary only has 2 runners, so having a non divided manifold, is it gonna alter things THAT much anyways?
discuss
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### Author:  [@focusinprogress](https://forums.speedlife.net/u/focusinprogress)
#### Post date: [November 3, 2005, 7:05pm UTC](https://forums.speedlife.net/t/divided-and-undivided-turbine-housings/4173/2 "2005-11-03T19:05:52Z")
do you mean you have a manifold/turbine housing that is a one-piece design? and you want to change to a different compressor? or that the manifold is designed for a specific outlet flange that is uncommon and you want to bolt a totally different turbo to it??
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### Author:  [@Adictd2b00st](https://forums.speedlife.net/u/Adictd2b00st)
#### Post date: [November 3, 2005, 7:14pm UTC](https://forums.speedlife.net/t/divided-and-undivided-turbine-housings/4173/3 "2005-11-03T19:14:50Z")
one piece on the manifold, not split down the middle. new turbo WOULD be split down the middle. but the flanges are both t4 flanges so bolting up is not an issue
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### Author:  [@focusinprogress](https://forums.speedlife.net/u/focusinprogress)
#### Post date: [November 3, 2005, 7:30pm UTC](https://forums.speedlife.net/t/divided-and-undivided-turbine-housings/4173/4 "2005-11-03T19:30:17Z")
so the manifold is staying, just the turbo is the swap idea from a turbo that the compressor and turbine housings are one peice in the same VS. one that the turbine and compressor both bolt to the center section???
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### Author:  [@catalyst](https://forums.speedlife.net/u/catalyst)
#### Post date: [November 3, 2005, 8:17pm UTC](https://forums.speedlife.net/t/divided-and-undivided-turbine-housings/4173/5 "2005-11-03T20:17:33Z")
> [@Forced Performance](#):
>
> **What are twin scroll or divided inlet turbine housings? What are the benefits of using a twin scroll turbo?**
> A “twin scroll” or “divided inlet” means that there are two separate volutes within the turbine housing. The main reason for doing this is to isolate the pulses coming from each exhaust port and maintain more of the pulse energy from each cylinder all the way down to the turbine wheel. There are no differences between the turbine wheels used in open or single inlet turbines compared to those used in twin or divided inlet turbines.
>
> Generally speaking, a divided inlet turbine setup will respond faster and produce boost quicker than single or open design of the same nozzle area, of course this is dependent upon proper execution. The simple fact that a divided housing is used does not guarantee these results.
>
> **While it does not cause any problems or harm to run a divided inlet turbine housing on a manifold that is an “open” design, none of the benefits of the twin inlet will be seen.**
This makes sense and is what I would have guessed. Who claims it is absolutely necessary to run a matched setup?
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### Author:  [@Xman](https://forums.speedlife.net/u/Xman)
#### Post date: [November 3, 2005, 8:23pm UTC](https://forums.speedlife.net/t/divided-and-undivided-turbine-housings/4173/6 "2005-11-03T20:23:25Z")
top- split
bottom - single
turblo n00bs
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### Author:  [@Adictd2b00st](https://forums.speedlife.net/u/Adictd2b00st)
#### Post date: [November 3, 2005, 8:53pm UTC](https://forums.speedlife.net/t/divided-and-undivided-turbine-housings/4173/7 "2005-11-03T20:53:14Z")
thanks for the photo kevin, i didn’t think it was rocket science either 😉
and thanks for that lil blurb up there catalyst, it confirms my theory :tup: