Jeez, all this math and science. It mostly just depends on what kind of boost controller you are using and where it is getting its source! If you get your boost source for the boost controller from the intake manifold when you add a larger intercooler, then depending on the boost controller, your boost level shouldn't change. Bleeder valves may have an issue since the air is more dense. I believe that the stock boost controller is a bleeder valve, and the ECU really has no idea what boost level it is trying to run, it only knows that it is sending the valve a certain duty cycle.

If you get your boost control source from before the intercooler, then you aren't really controlling your intake manifold pressure, you are controlling your compressor outlet pressure. Changes in temperature and intercooling efficiency will have a large affect on the boost levels you see in the intake manifold in this configuration.

 

I am using a Hallaman MBC and have it taped off the wastegate line.

 

My ARC intercooler gained 2 psi more...den stock without MBC...jus my 2 cents and a nickel...PEACE!

 

Ummmmm yeah one of the lines from your MBC should lead to the wastegate or it wouldn't be controlling much of anything...but where are you getting your pressure signal from?

 

You put on your intercooler and MBC at the same time? Please tell me this is not what you meant...

 

i dont see how a manual boost controler has anything to do with the psi loss. please explain better.

 

Try to understand it first. Then ask a more specific question.

Lessons:
1. Source your boost controller from the intake manifold since boost in the intake manifold is what you are trying to control.
2. If your boost fell after you installed an intercooler, who cares? Just turn the boost back up.

 

Yeah what the hell does a boost controller have to do with controlling boost