The 3 port MAC valve limitations with high boost

[2fnloud]

I thought I remember reading about issues with the LCDBC and MAC valve combination when it comes to high boost. Actually more so just the valve after talking with Antero. I did some research about this and was finding mentions of a 4 port MAC valve, so I did some searching on 3 port vs. 4 port. and found this forum conversation on a Supra site:

OP: 3 port mac valve vs 4 port mac I currently use a 3 port mac valve, is there a way by changing to a 4 port mac valve I can make more than 35lbs of boost? I'd like to make 40-45 if possible.

MEMBER 1: Absolutely. I have a 12lb spring in my tial 44mm and a 4 port Mac valve and my highest boost setting is 43.5lbs. There is still room on the duty cycle for the boost controller for more boost, too.

MEMBER 2: How do you set it up...never heard of doing this before, interesting. Also, what part number is it?

MEMBER 1:

MEMBER 2: So, does this work better than two 3 port valves? I can see its advantages but after doing some research its cheaper to buy 2 of the normal mac valves than this single 4 port.

MEMBER 3: I was making 30+psi on a 8lb spring. For high boost applications the 4 port is great. I found it difficult to control low boost situations with the 4 port because it has less resolution than a three port. However if you are going for high boost than the 4 port is great.

I also learned that running a 4 port valve or two 3 port valves Allows for small spring rate in the wastegate and still accomodate big boost. Am I on to anything here or just pissing into the wind?