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divided manifold/undivided turbo??

pboglio

Proven Member
1,793
78
May 8, 2004
Palos Heights, Illinois
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.
 

crazyquik22023

Proven Member
641
6
Sep 14, 2008
Akron, Ohio
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.

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??
 

pboglio

Proven Member
1,793
78
May 8, 2004
Palos Heights, Illinois
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.
 

jdsoza

Proven Member
129
0
Mar 2, 2010
Phoenix, Arizona
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
 

kimcheefists

Proven Member
337
3
Nov 7, 2008
Las Vegas, Nevada
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.
 

crazyquik22023

Proven Member
641
6
Sep 14, 2008
Akron, Ohio
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.

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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