Drifto

iTrader: (6)

Should drive it home today. I'm taking it to the house to remove everything for thermal coatings. I need the space at my shop. Anyway here are some new pics.

Drifto

iTrader: (6)

Couple under the hood

scorke

iTrader: (18)

Divided wastegate housing......but why?

Scorke

Speed Element

iTrader: (270)

damn sick!

Ted B

iTrader: (6)

The idea is to enable the use of one wastegate instead of two. TiAl 44mm WGs aren't cheap!

Drifto

iTrader: (6)

It wouldn't be a true divided housing if I let the paired pulses mingle before the wastgate releases. It would defeat the purpose of keeping everything separate, and like Ted said 44mm aren't cheap

94AWDcoupe

iTrader: (125)

There is no purpose to keeping the pulses separate going into the wastegate. The pulses are kept separate going onto the turbo in order to bombard the turbine with a bunch of small pulses, rather than pulses of mixed sizes. The pulses going into the wastegate never see the turbine. So how is it helpful to keep them divided?

EvoIXMR

iTrader: (66)

Nice work. I sent you a PM regarding 2 of your items!

Also - can I see a pic of the catch can in one of your pics. Looks similar to Mr. Saikou's catch cans!

Drifto

iTrader: (6)

You can build your twin scroll any way you like.

JKav

iTrader: (8)

The "feed tubes" to the wastegate are attached to the manifold, so if they merge then there is a flow path for the pulses to bleed into the other half of the manifold.

Dividing the wastegate feed is the proper way to build a divided manifold with a single wastegate.

ct9a gsr

iTrader: (7)

You could also weld a v-band flange onto the turbine housing and run a single wastegate there... I know FP makes these housings for the GT35R, not sure 'bout other turbos.

Ted B

iTrader: (6)

FWIW, he did a meticulous job of keeping the flow path divided, right into the WG. My hunch is that it should work just fine.

94AWDcoupe

iTrader: (125)

I understand the theory. I drilled a hole in my exhaust one day about 1.25 inch in diameter. Then I built a flapper to cover the hole with a spring that held it shut. I was attempting to build a super simple exhaust cutout. It didn't work so well for two reasons. One, it flapped open and shut at idle and was very noisy. Second, it stayed shut when car was under high boost. The exhaust gasses passing by even though under great pressure sucked the door shut rather than open it. The waste gate channel operates in a similiar fassion. The gasses take the path of least resistance. They dont like to make 90 degree turns. They dont go into the channel until the wastegate door opens. When the door is open there is a severe differential in pressure and the gasses will flood the channel and pass out the wastegate. When the door is closed the channel is at or near the same pressure as the passing gasses. The easiest path at that point is a straight one, right past the channel. It may be that the divider is actually a bit of flow hinderance and would work better without it. Gasses dont flow well next to walls. Thats why twin scroll a/r numbers have to be larger than a single counterpart.

Check out hondas new twin flow exhaust housing. It is of way better design.

Drifto

iTrader: (6)

The divider is doing it's job. This is after about a 10mi. ride to my house. Don't pay any attention to the "line" in relation to the outlet of the wg. I put different spring in the wg today and I spun the valve while assembling it. I would normally line up almost exactly halving the exit.

Jerry, as far as the divider goes, that is how my turbine housing is from Mitsubishi and it is the sought after housing. Mainly because it is a 10.5, but there are 10.5's with two holes as opposed to one large hole with a divider and the divided single hole is said to be better. I'm not an M.E. . I'm just a lowly fabricator, but I believe there is a reason why Mitsubishi divided the exhaust right up until the wg valve opens, and that was one of the reasons I did it. The wastegate as it was set up controlled boost as low as 5.8 psi so it flows well enough at low pressure. How about instead of speculating whether or not this set up is stupid, let me get the parts back from coating, get them on the car and go dyno it and see if it works well or not.
Thanks

240Z TwinTurbo

iTrader: (25)

The concept of the divider should reduce turbulence that can be experience when dumping into a large area. This may be the reason the Works O2 housing has been getting bad press in comparison to the $70 e-bay special as it dumps the WG and Turbine into a large area, which is not ideal. Ideal circumstances want the transition from small to large to occur at a 3deg-5deg taper. For those who have taken fluid dynamics or anyone who models air flow will understand. MPFab's attention to such detail is apparent. If I didn't do my own fab work I, I would certainly opt to take advantage of MPFab's skills.