Dual Manual Boost Controllers

I have a specific power goal in mind. 14 PSI wasn't getting me there. Too many FI LTD cars in the 700 range......very few 800 and up. I want to be one of those few.

Found the four port Mac valve for $60, so going that route from the get go now.

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Originally Posted by 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.

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Same thing happened to me, the problem was that I had reached the maximum pressure on the MBC (a 0-10 psi pneumatic regulator).
The 7 psi spring only got me to 5 psi running straight off the gate and 14-15 psi with the 0-10 psi regulator. Switched to a 0-25 regulator and it's fine now.

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Originally Posted by Fastbird

I have a specific power goal in mind. 14 PSI wasn't getting me there. Too many FI LTD cars in the 700 range......very few 800 and up. I want to be one of those few.

Found the four port Mac valve for $60, so going that route from the get go now.

Posted from my LG G2

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Well, easiest way to save time and money... pin gate shut and let her eat.

Idk why gate companies even advertise spring pressures saying "this one makes 14, this one 7", etc. So many factors contribute to how much boost a certain spring makes. Wastegate placement, backpressure, how much air is directed right at the valve, etc.

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[QUOTE=GuillaumeC;395287]You probalby plumbed it incorrectly.

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

Attachment 28530[/QUwOTE]

Are you talking about the port that goes into the tee from the mbc, that is plumbed into the manifold?

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Originally Posted by MoeHorsePower

Are you talking about the port that goes into the tee from the mbc, that is plumbed into the manifold?

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Like this:

Attachment 28544

What does referencing the manifold give you? You build pressure under your valve that way no..?

You need the pressure under the valve to open the WG and control boost level...

I just use the turbo outlet for the top port and manifold for the bottom port because usually the turbo outlet sees pressure sooner and higher than the manifold. This is supposed to help spool a little quicker since the WG starts to open later. Just what I've read, works for me but I've never had it plumbed like the first drawing.

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Originally Posted by Ryan Stout

Idk why gate companies even advertise spring pressures saying "this one makes 14, this one 7", etc. So many factors contribute to how much boost a certain spring makes. Wastegate placement, backpressure, how much air is directed right at the valve, etc.

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Ryan I think they actually test them for an average using manifold pressure on the lower port of the gate. I'd be willing to bet that a 7# spring actually has a 6-9 lb boost range dependent upon application. I would bet that the advertised numbers are interpretable and approximate.

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Originally Posted by GuillaumeC

Like this:

Attachment 28544

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Ahh Gotya, That what I was talking about, Thanks again