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divided manifold/undivided turbo??

Posted by crazyquik22023, Mar 20, 2010

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  1. crazyquik22023

    crazyquik22023 Proven Member

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    ok so my buddy asked me this and got me thinking. what would happen if you tried to run an undivided turbo with a divided manifold? I'm not really sure what would be the effects of this...
     

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  2. pboglio

    pboglio Proven Member

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    Good question. I run the FP exhaust manifold which has probably the best merging of runners to minimize exhaust pulse interference. Technically the runners are nearly completely divided up to the collector. Functionally its similar to an EVO 8-9 exhaust manifold. There are gains in power doing it, but without the divided turbine housing, your not getting the spool gains necessary to upsize the turbine housing A/R for even more flow.
     
    pboglio

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  3. crazyquik22023

    crazyquik22023 Proven Member

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    well actually my buddy has a 60 trim t4 turbo im pretty sure its a .70A/R hotside (which is undivided) and a divided t4 manifold.. so r u saying that the turbo wont spool right with this setup? b/c i guess he couldn't boost more than 10 psi and he went to 6k rpms. we didnt do a boost leak test yet so could using this turbo with this manifold cause the turbo to not spool right??
     

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  4. JEFFREYCASTGSX

    JEFFREYCASTGSX Proven Member

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    It shouldn't, if the the exhaust housing was divided and the manifold was undivided then it should.
     

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  5. pboglio

    pboglio Proven Member

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    I think you might want to post a different thread regarding a T4 60 trim on a .70 A/R turbine housing. Someone with experience with that turbo could definitely tell you where you should be spool wise.
     
    pboglio

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  6. crazyquik22023

    crazyquik22023 Proven Member

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    LOL ya good call
     

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  7. JusMX141

    JusMX141 Moderator

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    I'd think it would be better to have a divided manifold / undivided turbine housing combo than it would be to have an undivided manifold mated to a divided turbine housing.
     

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  8. beniger

    beniger Proven Member

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    i thought with a divided housing and undivided mani it spooled slower but had better top end? wouldn't it be the same but the other way around?
     

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  9. jdsoza

    jdsoza Proven Member

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    from what i understand they make divided housings/manifolds to balance out exhaust flow. Divided manifolds and divide housings should be used together because they are more balanced. What happens is you have companion cylinders on every engine, and you take the companion cylinders and put them into one port of the divided manifold/housing and then the other companion clylinders to a different port hole in the manifold/housing. it almost acts as a form of timing, and helps increase spool up. thats what i am understanding LOL
     
  10. beniger

    beniger Proven Member

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    it increases spool at the bottom end but you lose it at the top end when both mated together hmmmm
     

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  11. mitsubishi9908

    mitsubishi9908 Proven Member

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    who's going to be a test dummy. sounds like an interesting idea.
     

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  12. beniger

    beniger Proven Member

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    i should be running my holset soon with the stock 12cm^2 housing i'll let you know when i get there LOL
     

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  13. crazyquik22023

    crazyquik22023 Proven Member

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    well like i said above my friend is already running his car with a undivided turbo/divided mani. and he is having problems boosting past like 10 psi. but it may be b/c of a leak.. not sure yet.. but ill let u know how it boosts when we get it running
     

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  14. kimcheefists

    kimcheefists Proven Member

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    The divided manifold is called a twin scroll manifold specifically made for a twin scroll turbo. IMO it'd be a waste of money if you were going to use this on a single scroll turbo. The back pressure from the cylinder that's in its exhaust stroke would still interfere with the cylinder that JUST finished its exhaust stroke.
     
  15. crazyquik22023

    crazyquik22023 Proven Member

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    ya divided/twin scroll... same thing but my buddy had the manifold and then bought the undivided turbo b/c he got a good deal on it.
     

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    1998 Mitsubishi Eclipse GST
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