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Old 10-14-2010, 02:16 PM   #1
quick-silver
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Default divided-vs-undivided turbos

Im looking into running 2 s366 turbos on a 23* brodix headed sbc 383cu on e-85.

My question is: is there a large power/spool difference if i run divided or undivide turbine housings. There are 2 different options .91 ar divided or .91 undivided. Everything else is exactly the same.

Which would be a better choice?
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Old 10-14-2010, 02:56 PM   #2
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Default Re: divided-vs-undivided turbos

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Originally Posted by quick-silver View Post
Im looking into running 2 s366 turbos on a 23* brodix headed sbc 383cu on e-85.

My question is: is there a large power/spool difference if i run divided or undivide turbine housings. There are 2 different options .91 ar divided or .91 undivided. Everything else is exactly the same.

Which would be a better choice?
The .91A/R divided will spool a little quicker then the un-divided. A/R's are calc. as a total area of scroll. So the divided is actually a smudge smaller then a .91 undivided as far as area is concerned.
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Old 10-14-2010, 03:10 PM   #3
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Default Re: divided-vs-undivided turbos

i assumed the divided would spool quicker but didnt know how much faster or if the divider would become a potential restriction.

Im looking to make about 900whp and run some 8.80-8.90 in a 3300lb car.

Sounds like either would work then?
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Old 10-14-2010, 05:15 PM   #4
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Default Re: divided-vs-undivided turbos

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Originally Posted by quick-silver View Post
i assumed the divided would spool quicker but didnt know how much faster or if the divider would become a potential restriction.

Im looking to make about 900whp and run some 8.80-8.90 in a 3300lb car.

Sounds like either would work then?
Either one will do the job just fine, just depends how you want to build the manifolds. I generally prefer divided housings for better efficiency, but for drag its not a huge issue.
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Old 10-14-2010, 08:18 PM   #5
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Default Re: divided-vs-undivided turbos

Quote:
Originally Posted by quick-silver View Post
Im looking into running 2 s366 turbos on a 23* brodix headed sbc 383cu on e-85.

My question is: is there a large power/spool difference if i run divided or undivide turbine housings. There are 2 different options .91 ar divided or .91 undivided. Everything else is exactly the same.

Which would be a better choice?
You would be hard pressed to find any benefit from a divided housing with a 90 degree crank application using conventional turbo headers on E-85 or gas.

Personally I would run the undivided as the divider often creates a perfect riser for stress cracks often associated with EGT of E-85 and gas applications.
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Old 10-17-2010, 07:50 AM   #6
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Default Re: divided-vs-undivided turbos

I vote for undivided. I build lots of turbo manifolds and undivided wins hands down for ease of plumbing. To do it properly with a divided housing you should run 2 wastegates to avoid mixing up the gasses from both sides of the manifold which defeats the purpose of having a divided housing in the first place. An undivided housing is also a fair bit lighter.
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Old 10-17-2010, 11:27 AM   #7
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Default Re: divided-vs-undivided turbos

We've done a lot of testing and there is no advantage to it. Keep backpressure between the two configurations the same and there is no difference between the two.
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