Why a boost controller?
 

I was wondering this, if you have a Power FC, then why get a boost controller. Isnt that controlled by the PFC? How does it work exactly?

i would say because the pfc boost controller is only controlled through the ecu...as with a boost controller it is mechanically controlled

because, every fd is different, some are able to control boost with the pfc and other that aren't able.

Getting a seperate boost controller is much more accurate.

Max

But what happens when the PFC is set to throw out .90 bar and your boost controller is higher? Dont they act against each other? or does the boost controller take over since he lets threw more air from the turbos?

When you hook up manual boost controllers with a PFC, you disconnect the vacuum lines going to the wastegate and prespool solenoids, therefore the PFC no longer can control boost.

And if you have the pfc boost set at .9 bar, and your boost controllers set higher, the PFC will cut power to keep you under .9 bar.

generally the PFC boost would be higher and the boost controller would control boost up to the level you specify.

Exactly. :bigthumb:

To elaborate on what cloed and alberto said:

The PFC can control your boost without the need of an aftermarket controller, because it can activate the stock wastegate solenoid. The problem with this setup is you are relying on a 10+ year old heat-cycled solenoid to do this (unless you have replaced it obviously).

An aftermarket electronic boost controller uses it's own, potentially higher quality, solenoid to actuate the wastegate. The stock solenoid is disconnected and plugged. With an aftermarket ELECTRONIC boost controller installed, the PFC can no longer manage boost -- EXCEPT, it can and will enact fuel-cut if you exceed 0.25 kg/cm^3 boost above the target boost settings. A good rule of thumb is to set the PFC at approximately what boost you are running with your boost controller. That way, it won't fuel cut during normal use but will fuel-cut if something goes wrong with your solenoid/wastegate.