here is the first pic of the new setup, so far so good. The turbo spools up nicely and there are no vacume leaks. We will see how it runs this weekend.

andrew wagner

Go Andrew! I love it!

Bob D


BBobbias@aol.com

Looking good, Andrew. Go for it. 13's this weekend?

Charlie

flturbo6@aol.com

there is snow on the ground here and all the tracks are closed until the end of feb. so I have until then too tune it. Ran it today after work the #1 and 6 are rich and the others are good so it will come apart to put some baffles in. It did pull hard for only 7 lbs of boost. I will let you guys know.

andrew wagner

Boundry effect,
the heavy / wet fuel goes out to the walls, sticks and runs along the wall into that (those) cylinders. I saw this with the repop Hyper-Pak, 1 & 6 ran rich.

I had baffles running up the side walls to try to scrape the wet fuel off before it got into the #1 & 6 runners, try to "deflect" more wet fuel into # 2 & 5, these were the lean ones in the Hyper-Pak.
DD

Are you saying to put the baffles on the walls of the intake and not the bottom? And what material did you use?

andrew wagner

Where to start with this . . .
The material I used for the final fix is the same aluminum as the manifold casting but I have used some epoxied-in wood dams to do some tests. (removed and replaced them after I got the results I needed)

Once the dams size & position is determaned, a good "trick" is to put a slice through the manifold where the dam is needed (abrasive wheel or end mill slot) then press-in a oversized wafer of metal that creates the dam on the inside of the manifold, then weld it in place from the *outside*, basically by welding close the slot and the wafer insert's "butt". (I recess it into the slot just a little to allow space for the weld "bead")

One way to help get an idea of distribution and how well manifold shape / dams changes are working is to use water. (garden hose with a spray nozzle) Try to simulate with water how the mixture will "blow-into" the plenum area and watch each runner outlet to see how much water is leaving each runner port. Doing this will show you how minor changes in stream size, volocity, angle of entry, plenum shape and dam position(s) all change the distribution. This is complex stuff and the results can be unexpected / surprising. (stuff that should work does not, crazy stuff does work !?!)

With your new manifold, here is one thing that you need to test and think about.

If you look at a lot of factory designs, including the Hyper-Pak, the plenum area is enlarged all the way around the entry area, even where there are no runners to "feed". Blank plenum wall(s) tend to "bump" inward or jog in at a point to direct mixture off the wall(s) and towards a leaner cylinder.

So the answer to question #1 is yes, you may need to put some kind of baffle up along the back wall leading directly to runners #1 & 6 to deflect mixture over to runners 2 & 5 (an ed. guess on my part) How big of a dam(s) and where to position them will take some trial & error to figure-out.
(hence the garden hose test fixture suggestion)
I will try to draw-up and post some ideas you can "play-with".
DD

Looks like fun, I am wondering about the exhaust manifold/header. Did you build that or buy it? I am in the middle of a similar project as I have 2 turbos to choose from. One being a 84 thunderbird turbo, the other is from a 97 Mitsubishi eclipse. I still remain confused on the exhaust part and how to go about it. Any tips you can fire my way would be great. I also plan on using a intercooler, possibly from the eclipse, Ray

Myblue684x4@Aol.com