Greg

What are the benefits of these turbine housings compared to each other? What are the pros and cons?? Thanks in advance, doing some research

spyfish007

My understanding was that the tangential housings flowed 10 to 15% more for a given AR.

007007

from what i understand by referring to a tangential housing you are referring to a divided housing. this helps turbos with a bigger A/R spool up a little quicker because the two runners create greater air speed hence quicker spool up. however, when pushed to the absolute limit it creates a restriction.

An on centre or open housing is just that no division, so in effect one runner. works well with smaller A/R's but once you start getting to the bigger housings it gets a bit hard to generate the air speed to make the turbo boost at a reasonable rpm level.

spyfish007

um, there are two kinds of tangential housings.... divided and undivided. It is known that the undivided flows more.

RX7SV

I agree with what spyfish said. The tang housing flow better. I think the only reasong you would want an on centre housing would be to overcome mounting issues.

RETed

Sure, if we're talking about maximum flow potential, the collected version would flow more due to not having the central divider in the center (collected versus divided Garrett T04 turbine flanges are the same otherwise).&nbsp Now, add engine exhaust pulses (especially on a 13b two-rotor), does the higher potential of the collected turbine housing necessarily "better"?&nbsp No, not in this case...&nbsp The divided turbine housing takes a huge advantage of the 13b two-rotor 180&#176 out-of-phase exhaust pulses to make for more efficient turbo spooling.&nbsp Bigger is not necessarily better in this case...


-Ted

spyfish007

I agree 100% Ted ... I just wasn't opening that can of worms.

Maxthe7man

I am not positive about all turbo's but judging whats in some of the turbo catalogs, you have to move to a larger a/r to get a divided housing, which most likely offsets any losses caused by the center wall of the housing, but retains or enhances the quicker spooling effect. There always seems to be a jump.... .84/.96 open etc etc then .96/1.0/1.15/1.32 divided, at least in the books I have. The only times I recall seeing different is when some tuning house has come up with their own mish-mash of garrett parts to suit a particular application..Max

Rutt

I just took a look at some of my extra housings and the tang housings have a smoother transition where exhaust flow enters the housing whereas the on-center housing has an awkward bend at the entrance. I'll try to post some pics later so you will get a better idea.