Finally getting stuff done on our cars

[Goat Blower]

Spool isn't the problem, it's averting enough exhaust gases away from the turbo to keep the boost at a steady level. With a divided manifold and a single gate, the turbo is seeing less exhaust pressure from two of the runners than the other two. A single wastegate on a tubular manifold is usually plumbed into a merged collector, not a divided. This is similar to the way Buschur used to weld an HKS external on the number one runner of a stock manifold or the old cast T3 manifolds. I'm guessing this will cause some erratic boost control with this size turbo, but practice outweighs theory everytime. We'll see how it comes out. It shouldn't be that tough to add another wastegate later.

[carltalon]

Id be worried with high back pressure on 2-3 and low back pressure on 1-4. When the wastgate is open. But like Steve said people have been running gates of the #1 cly forever. I would try to do a single setup like in these attached pics.

[FattyBoomBatty]

Yeah, it should be fine. how big is the plunger/valve on the greddy type R?

[Shane55113]

Sweet! i am impressed with the way the Galant is setup.

[Pushit2.0]

I did plan on running the waste gate off the two collectors right befor the turbo and weld in a divider so there would be only a little cross over with the #1/4 to the #2/3. My thought is this turbo is huge, big, massive, the #1/4 will be full bore on the turbo but the #2/3 would have exhaust gas energy wasted. So I do not know how well a 1liter 2cylender motor would spool/keep a GT4202 spinning, 2 waste gates it is I guess.

~John

[Goat Blower]

There is another way. :sasmokin:

[Matt D.]

There is another way. :sasmokin:
I thought of that as well. Unfortunately, that would defeat the purpse of keeping the runners separated.

[Goat Blower]

I thought of that as well. Unfortunately, that would defeat the purpse of keeping the runners separated.

Not really unless you're running real low boost.

[Pushit2.0]

That was my first plan, I do have room under the turbo or under the primary runners, we will see. I would have it divided all the way to the bottom of the valve seat, which should be close enough.

~John

[PSI2HI]

http://www.lseperformance.com/gallery/main.php?g2_itemId=3324
The waste gate will only be on the #2/3 collector, so the manifold will stay divided, if it runs less then 30psi I will be happy, race gas and track times are all I care about right now. If the boost goes low enough it will get a full pump gas tune, if not I will add another waste gate off the #1/4 collector.

~John

Your only gonna run the gate off 1 side of the collector??