The more I think about this the more I think I can understand. This sounds like a very interesting mod that would be worth a shot to see if it will work. Im going to look into buying into one of these and testing the waters. Is your 366 open or twin scroll?

 

The concept is very simple, and the product seems to work well. By using one half of the divided housing, you have an increased exhaust velocity which is helping to spool the turbo quicker. When turbo is spooled up(and backpressure in the housing increases) the other half of the housing is opened. Ive seen a couple dynos, but I would really like to try the valve out for myself. Dyno's havent shown it, but I have the feeling there would be a very short plateau of power when the valve opens.

Only downside is the downpipe needs to be modified for the valve to fit. Rob, you get your S372 on there yet?

 

think of it this way, this is the same principle as putting your thumb on the end of a garden hose.

you close off most of the opening with your thumb to increase the pressure of the water, but much less volume of water flows out that small opening. when you take your thumb off, the water flows out with less pressure, but more volume.

 

My s366 is undivided. If you do this Brennen do a before and after if you dont mind. You would have to buy the divided exhaust housing which Isnt too much money.

I havnt put a 372 on mine. Im still up in the air. I actually might go with a 91-79 and see how I like it. If i dont like it ill sell it for something bigger.

 

The 91-79 is essentially the same thing as an S366, just a different name. Sometimes Bullseye does mismatch turbos and use an undersized turbine wheel, but if they have the 79mm turbine with the 66mm compressor, its a 91-79.

 

Thats cool I wanted to try the 2 different housings regardless. I have a Borg Warner dealer like an hour from my house so that wouldnt be an issue at all. What was the ar on the exhaust side? Never asked lol

 

looks like it spools no faster than an actual twin scroll manifold would and obviously doesn't have the top end advantages either... I can't see why anyone would waste their money... and that's based on the manufactures most likely generous dyno graphs

 

it's boost activated with an wastgate type actuator. should last as long as any turbo. I have their boost activated cutout using the same parts, very well built.


So I'm currently running a GT3076. For this to work with my setup (Full Race manifold) I would have to change my (.82 AR) exhaust housing to divided housing if I wanted earlier spool but more top end? Similar to a twinscroll setup?

Do i have to replace the flange on the manifold or does this bolt on in between? I'm just worried about having loosening bolts, leaks, etc. I'd love to take advantage of this. I remember seeing this when I ordered their cutout but didn't think it can apply to me until you brought it up

 

Well apparently there are multiple individuals in the supra world that stand by this part. Their dyno may be a very optimistic one, but the evidence provided is enough for me to want to see if it does in fact work. Its worth a shot

 

The big key is Velocity and Pressure. If you funnel all the exhaust through a small scroll it will have to spin the turbine faster to exit. As the back pressure builds the diverter will open then lowering the back pressure to allow easier flowing on the top end.

The only problem I see is the added restriction but if you use a T4 flange this should not be any problem.


Oh, and Rob, thanks for the idea, I like this but you are still a trader.