Manifold Runner Size
01-25-2006, 09:17 AM
#1
3.0 BAR
Thread Starter
Join Date: Sep 2003
Posts: 3,751
Manifold Runner Size
I have changed my mind from a top mount to a sidewider manifold. I plan on building it with 16g Mild steel. With my Design NO weight of the turbo will be on the manifold so this material is fine.
What size should I use? I can get 1.5" or 1.75". What would be better. SHooting for 320-350whp.
What size should I use? I can get 1.5" or 1.75". What would be better. SHooting for 320-350whp.
01-25-2006, 05:46 PM
#6
1.5 BAR
Join Date: Sep 2004
Posts: 1,460
Re: Manifold Runner Size
smaller runners keep exhaust puses closer together where they have more energy to spin the turbine wheel. Kinda like how a t4 has a divided inlet, to keep 2 seperate smaller columns of exhaust gas together all the way to the turbine for more energy. Basically, it spools the turbo up quicker
01-25-2006, 07:19 PM
#8
1.5 BAR
Join Date: Nov 2005
Posts: 667
Re: Manifold Runner Size
there should be a calculator for this beacause a small runner will help spool up but can choke up top. i would aim for a 1.5 id just because that seem to be what most manifold are made with. if you cant get that then get the bigger one not smaller
01-26-2006, 09:15 AM
#10
3.0 BAR
Thread Starter
Join Date: Sep 2003
Posts: 3,751
Re: Manifold Runner Size
Ya I read it.
I went with 1.5". I know the difference between Pipe and Tubing. If this ends up being too little for my goals I will just re-order my pipe and build a new one. No big deal. Pipe was cheap locally and a $4 difference between the 2 sizes.
I went with 1.5". I know the difference between Pipe and Tubing. If this ends up being too little for my goals I will just re-order my pipe and build a new one. No big deal. Pipe was cheap locally and a $4 difference between the 2 sizes.
