i'm looking to build a turbo manifold for my holset hx35, which comes with a divided housing. i'm familiar with the concept of cyl 1,4, and 2,3 being paired up on each side of the collector. i was wondering however, how useful it is for the collector to be divided? is it worth the trouble to completely seperate the paired cylinders in the collector. then the question is, will a wastegate setup that comes off of each side of the two collectors into one unit be efficient using a 38mm gate?

looking for input on if a true split collector, with a dual feed style wastegate, is worth the trouble as compared to a normal collector with the single feed style wastegate.

or in fact is the paired cylinder manifold, even worth the trouble for the divided housing?

thanks guys.

 

I just completed my personal manifold for my civic. I am using a Divided housing on my turbo. I wanted to go 1,4 and then 2,3 but I just went 1,2 and 3,4. design is very simple with 45* angle off the head and then into the collector. The car is still getting some tweaking* done to it. I will try to find my camera, (darn kids) to get some pics.

 

cool, i'd like to see some pics

 

We have controlled somewhere in the neighborhood of 30-40 psi with a single 35mm turbonetics waste gate (the turbonetics one might be a little smaller or large then 35mm).

How useful is it? hard to say without some really good back to back testing but, as far as i have been told the idea behind it is to descrease spool time.

 

do you think the divided collector vs open collector will make any difference?

 

in theory yes!