I noticed that as well. Looks like a fun project though!!

 

What do you foresee to be the problem?

BTW, I think I have resolve the wastegate issue and will post some pictures tomorrow afternoon once I have completed the new pipe routing.

 

I figured out how to run the wastegates. I changed the routing of the DS wastegate directly into the downpipe and will tie in the PS wastegate before the downpipe and after the slip joint. I did not have enough room for the bellow so I used a double slip joint instead. Should have the other wastegate run tomorrow and will start on the downpipe.

 

OK, I was able to resolve the wastegate issue.

 

Nice fab workk

 

impressive work. very nice setup

 

You will have higher back pressure on the one cylinder that is NOT being relieved by the waste gate (because of its placement on the runner from the single cylinder) and lower back pressure on the cylinder that IS being relieved by the entire waste gate. I don't know exactly how much that will affect your AFRs for those two cylinders but one will be rich, and the other lean.

With the geometry of your recirculation setup, I expect there to be a lot of turbulence across the exhaust flow out of the turbine when the waste gates are open as well...

It would be great to see if those effects could be measured...

I'll will also be interested to see how serviceable (on and off) the waste gate/downpipe combination configuration is after you heat cycle it a few dozen times and have to pull the downpipe. I had a similar setup with one gate on a earlier generation Mitsu and after it was run a few hundred miles it was on for life or you could never get it to fit again when you took it off because of the warping changes in the tubing after the heat cycling...

 

Thank you for the input. Perhaps you are right and perhaps your are not...who knows. Without the ability to collect such data you are only guessing. I suspect it will find a way to balance itself, but again...who knows. If I had to do it again I would have placed the other wastegate at the collector and not on the runner, but that is because it would have made it easier to run the wastegate dumps.


In all my previous projects I have never had this issue. Even in cases where I hard piped the wastegate without slip joints or bellows. In this case the bellow allows for a lot of adjustment and the slip does as well, but not as much. We shall see.

 

I started on the downpipe and made good progress, but did not have a chance to finish today.

 

where did you get the piece of v band pipe for downpipe off turbo. i have been looking everywhere for some pipe like that. last piece i need to start my car;( please pm me thanks

 

Mr. Dong,
Those can be acquired from ATP Turbo...

V-band flange from ATP

 

I finally finished the downpipe. I just took the downpipe I used to run (Greddy I think) and modified it for this setup. As you can see I made some minor changes to clear the ACD and line up with the new turbo. I still don't understand why they can't seem to offer a downpipe to clear the ACD as there is plenty of room.

I will take some pics from underneath the car once I finish the final weld and reinstall.

 

I am starting to put everything back on the car in preparation for starting this weekend. This is contingent on my perrin intake filter arriving tomorrow, but everything else will be complete. Pics below are of the downpipe installed and you will notice the bung on the side of the downpipe below the oil pan. I am going to run a test to see if the vacuum draw from the exhaust is greater than the turbo inlet.

 

Any specific reason you ran a slip fit on one dumptube and not on the other...? Just curious. Everything looks great!

 

Technically they are both slip fits, but one is a double slip and the other is a single slip over wrapped with a bellow. I would have preferred to run two bellows, but could not due to space limitations (diameter of bellow). Always a learning experience the first time.