Hi all. I searched and have found nothing on the subject really.

I was wondering if there was a way to go 3rd party turbo manifold for an upgraded turbo (NOT HYBRID) that also has the twin scroll? Now that I got my twin scroll working on my 6 port NA-T engine, I love it! But just looking at my options in the future after the 2.1 rtek comes out.

I am looking to most likly run a gt35r turbo. (Just cause I know where I can get one for pretty cheap)

Thanks
~Tweak

 

wait. hold on, i think i know of one, give me 5 minutes.

 

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/pics-aftermarket-turbo-exhaust-manis-643330/

second manifold down. The guy is working on my car right now and his work is *amazing*. And he is located in SE washington, so if youare in pullman, its like 2 hours away.

 

second post down, my bad.

 

Thats a fully divided manifold. Not necessairly "twin scroll" liek the stock turbo.

Plenty of fully divided manifolds avaible, and Linder is certainly one of the better ones.

 

What are the benefits and cons from running a divided or twin scroll manifold?

 

Divided manifold and turbine benefits:

Faster spool up
Higher effciency

Downsides:

Cost

 

Could you guys please stop saying "twin scroll"?

Mazda used the term "twin scroll" for their Zenki FC set-up, which used a flapper door to close off one side of the turbo turbine.
With the Kouki FC set-up, they called it an "independent twin scroll".

Really stupid to do this, IMO.


-Ted

 

What do you want me to call it? I don't think that

"Any 3rd party flapper door to close off one side of the turbo turbine"

would have been a good subject.

 

hahah, that's why I was confused - I wasn't exactly sure what you asking for?

What you're asking for is the same type of system that the Zenki FC turbo uses.
It's archaic and doesn't work that well.
Mazda went to the "independent twin scroll" for a reason - it works better.

This "indendent twin scroll" is what most of us called a "divided" system.


-Ted

 

Twin-scroll refers to the turbine housing, not the manifold. It's the turbine housing that has two separate scrolls within it, and both S4 and S5 turbos are effectively identical in this regard. Mazda's twin-scroll control system on the S4 controls whether one or both scrolls receive flow. The manifold simply houses the mechanism that does that.