Just read that you can use a 4 port to have more control over your boost and run a small spring on your wastegate. So I want to run a 10psi spring, but be able to run from 15-40psi on my car. Doing this with an MBC is just not possible. It seems that on the evo everyone runs a 3port, and there is not much info on a 4port.

Anyhow if you have any info let me know.

 

There is a section in this PDF on how to hook up a 4-port.

look for a MAC solenoid model# 46A-AA1-JDBA-1BA. You should also add a 10 ohm resister in line to keep the ECU happy.

Report back how it works out.

John-

 

Why does it need a resistor?

 

So the resistance of the 4-port solenoid more closely matches the oem bcs solenoid. the 4-port is ~10 ohms less resistance than the OEM unit which means more current will flow through it, which means the ECU bcs control circuit will see more current (heat). Lots of people running the 3-port without adding a resistor, having an electronics background makes me a bit more nervous about doing so. ECU's are a lot more expensive than a resistor.


John-

 

We have run 4-ports before. Turbo Smart makes one. A lot of Honda guys will use these as well so they can run ~5 PSI or less in first gear so they can actually hook up and then 30+ PSI once they get it into 3rd or 4th.

I don't think you need a resistor but I could be wrong. Pretty sure they wire in like the 3 port. They are just a little more difficult and finicky to set up.

 

You can run a 3 port with nearly same results .I did it on my Subaru. I'll post up a diagram later

It allows both ports to be used for excellent control.

 

I have a 3port already, however I would love to run a super small spring, and still be able to run tons of boost for the 1/4 mile. Because I have a full 3d boost target map, I want to be able to run 87oct at like 15psi, and e85 at 40+psi. But when I road race on e85 I would prefer 15-20psi depending on the track. So that is why the 4port seems like a great fit for me.

 

Have a solenoid diagram for that solenoid btw? Curious..

 

I think 3 port using both ports this is doable I had 3 psi spring and ran 24 this way

 

I'm looking for a 6 port 2 pos so I can use boost and vacuum for control.

Or parallel wire two 3 ports.

 

would the top diagram work with a dual wastegate setup? ie dual mvr?

better yet with hybrid boost (mbc,ebc) how would i set this up can anyone draw it?

 

Use option 1 in that pic. That setup style has been around for ages, and works for the mass majority that don't need a huge fluctuation in boost range on a very small spring.

That net me 40-41psi, on a 9lb spring using the above picture on a 3-port.

Mitsubeast, just Y the vac line before the WG.

 

why do you want to run 87 octane??

 

I will only put gas in my car if I am going to drive a huge distance. So if I want to hit the track in vegas, I can bring my e85 in the trunk, but drive all the way out there on **** gas. So it will just be for long distance freeway hauls. Don't need to run expensive gas for that.

 

We have used them on RWD/FWD cars. On a 2JZ we did recently it ran 5x more boost than spring pressure if we wanted.