jordoza

I apologize for being misleading. That wasnt my intention. By triple if you mean two high pressure or small turbos and one low pressure or big turbo then yes that was my original thought. I had thought twin 61/62 and a single 106. Decided i throw it out for opinions and it sounds like i should go twin 50mm turbos and the 106 if im hearing right.

jordoza

So a single 6766 compounded with the 106 should do the deal. Im not stuck on the 106 but a friend has one to donate to the cause that i can pay for if i wanna keep or kill it. I have the 6766 laying around used so that would get me in the ball park. I did like the idea of the holset hxs though. Let me see about finding a couple of those.

jordoza

Im actually getting excited about this set up. I had kind of got burned out doing the same old same old. Its fast to do two big turbos but i am interested in the challenge of something off the wall here.

bnorth

Oh man holset lovin', those are my roots. I would recommend a pair of HE351's over the hx35's though they flow a lot better even through a tighter turbine housing. This whole scenario has sent me back to pressure map school, I'm unsure about the flow rates of the secondary chargers supporting your goals.

stevieturbo

Really....compound...will compound the problems lol.

And the notion of twins and then a further single sounds like a plumbing nightmare.

If you have a 6766 sitting there, then it's a no brainer just to use it and build around it. If it doesnt perform as expected just swap it out for a different single.

jordoza

Ok so we are on the same page your worried the high pressure turbos will be to small to reach my goal which is honestly a little fluid. My old engine set up made an estimated 1000 wheel hp and im wanting to improve on that while making drivability better. Crazy **** to even right that. Lol.

So when you say secondary you mean the small turbo and the big one would be the primary?

rpm-inc

iTrader: (2)

Here is what I got for compounds..... I did that set up on a 2003 e350 powerstroke. 66mm and gt4718. It has been a while and I used to know the PR math. Anyways, the 66mm making the equivalent of 7 being fed by the gt4718 @ 15psi was 55 psi.

jordoza

Damn im not planning on more then 28 to 30 but i guess if i went low compression, like 8.5 to 1, i could be fine with 35 or 40. If i follow the control scheme off of the guy on yb i can control boost pressure pretty easily. He uses two wastegates one to bypass the high pressure turbo turbine when the big turbo is spooled and one to control boost pressure. Ill probably do one 60mm to by pass the turbine on the 67mm and two 50mm gates to control boost pressure since im running a v8.