fritts

iTrader: (5)

Couldn't really find it searching but looking at how a divided turbine works wouldn't it have less ultimate flow when compared to a collected housing. I know divided gives you spool based on how it forces the exhaust on both the short and long radius of the turbine but if your hurting on the top end all things being equal it seems like a collected housing would flow more as both exhaust ports could push more flow through the long arm side of the turbine. Thoughts?

Zero R

iTrader: (1)

Comparing apples to apples the collected should flow more. It will have many variables involved, as a rule to follow the divided will allow you to step up a size or so and not lose the response. Again though it can vary greatly simply by manufacturer. Meaning a 1.0 collected "X"(manufacturer) turbine. Might flow less than a 1.0 collected "Y"(manufacturer) turbine.

Another thing to consider that will effect flow is how well the manifold is made. You could run a 1.0 collected "X"(manufacturer) turbine on a poorly designed manifold and it wont flow near as good as the 1.0 collected "Y"(manufacturer) turbine at that point.


It also sounds to me as if you have feeling the housing is separated on a inner and outer radius and they aren't they are split down the centre.

RacerXtreme7

iTrader: (2)

What Zero R said.

It varies from manufacture to manufacture. Some of the Mitsu turbine's run a dual A/R turbine, were the left and right turbine inlets hit the turbine blades at different angles of attack. BUT, the Garrett turbines are true split down the middle turbines. And comparing apples to apples (Garrett open valute to Garrett divided) a divided with the same A/R and properly pulse tuned (equal length and taking exhaust timing into consideration { such as the PERFECT rotary engine with a 180 out exhaust pulse or a 4 cylinder with a 180 crank using 1 and 4 and 2 and 3 plumbed to left and right of the turbine}) then divided turbine will spool faster and flow equivalent to a same A/R turbine. You then gain the advantage of going up a step in A/R value to gain flow if you so wish and still spool FASTER or as fast then a smaller sized open valute turbine. Its a win win situation granted you go the extra expense or work and make a proper divided manifold. You also gain in the fact that your exhaust pulses from one rotor (or cylinder) does not dilute or add back pressure to the opposing rotor/cylinder. This isn't here-say or an opinion but rather proven fact over the years of motorsports and extensive turbocharging technologies research done by MANY manufactures (Garrett just to name ONE).


~Mike.............