Dual Manual Boost Controllers

[Fastbird]

Ok guys, tell me if this is crazy or not.

In a normal mbc setup, you've got uninterrupted manifold vac and pressure going to the lower port on the wastegate, and the mbc adds pressure to the top port of the wastegate I'm order to raise the boost. This effectively lets you run approx double the spring pressure of what's in the gate. Essentially the same thing as if you ran with nothing hooked up to the gate. The mbc allows you to set boost between the spring pressure and double.

Now, there's electronic gates that do two things. Add pressure top side, and remove pressure from the bottom side.

What I'm getting at is if you could use two manual controllers and emulate that. One plumbed to the top port, one plumbed to the lower port. Run until you max out with the top port controller, then start shutting the lower port controller.

Would this work?

Posted from my LG G2

[ZOHAN]

Essentially I dont see why it wouldn't? But wouldn't it v e easier/cheaper to do an electronic? Unless you have two laying around and want to tryn...

Making you silky smooth...

[Fastbird]

I'm thinking out loud more than anything. Realistically I want to get the FAST controlling the boost, but I'm picking up a Hallman Pro for interim use, and if it works well, I may try the dual setup as it would be easy enough.

Posted from my LG G2

[shownomercy]

I think you are crazy.

Run it on WG spring only and then start messing with things.

Establish a solid baseline.

[GuillaumeC]

MBC plumbed to the top of the 'gate won't limit you to double the spring pressure... the limit is what ever pressure the regulator can supply the top port with + spring pressure.

They way mine is set up, the bottom port connects to the intake manifold (sees vacuum and boost) and the top port is connected to the MBC's outlet which is fed by the pressure port on the compressor cover (sees boost only).
That way the boost always pushes on top of the WG until pressure on the bottom is high enough to crack it open. Reduces lag vs a "pressure bleed" setup on the bottom port only.

FWIW my WG will do 5 psi on springs only and ran as much a 20 psi with a 0-25 psi regulator.

[MoeHorsePower]

since we cannot run electronic boost controllers I am on the spring only, but with a 17lb spring i can only get 10lbs, I tried plumbing a MBC and it did nothing..

[GuillaumeC]

since we cannot run electronic boost controllers I am on the spring only, but with a 17lb spring i can only get 10lbs, I tried plumbing a MBC and it did nothing..

You probalby plumbed it incorrectly.

Mne is plumbed like this, except the bottom port goes to the intake manifold.

1284d1315582146-where-install-manual-boost-controller-wstgate.gif

[MoeHorsePower]

You probalby plumbed it incorrectly.

Mne is plumbed like this, except the bottom port goes to the intake manifold.

1284d1315582146-where-install-manual-boost-controller-wstgate.gif

Dont remember how I plumbed it, but I'll give this a try, Thanks

[Fastbird]

That's how I had mine plumbed but it only would get to double pressure. It's the same thing as running open. Once the pressures equalize across the gate, the exhaust will push it open. I may have run a little more than double, but not much.

I found a four port MAC valve that will bleed off bottom pressure and apply upper pressure. Going to just go straight for that with the XFI at this point it looks like. If I still have issues, there's a choke issue in the hot side and it's building up too much pressure. Either that or my MBC last time on the dyno was junk because I had it hooked up exactly like above myself and it wouldn't go past 14 lbs on a 7lb spring.

[shownomercy]

Yea, you have a large restriction... its called a T4 76mm turbo feeding a 383ci motor with very well flowing heads.

I do not see why you need/want to push it so hard, you just end up leaning heavy on meth and for what?