View Single Post
Old 03-30-2005, 09:27 AM   #7
Scooby Specialist
Member#: 69343
Join Date: Aug 2004
Chapter/Region: South East
Location: 'tween Lewisville&Clemmons NC
1998 TransAm cnvrtbl


Didn't notice that that middle post was by Blackie.

See, we are defining control in two different ways. The MBC has control over the boost. You do not have control over the MBC except to set one boost level.

The FBC is controlled by the ECU. So it can "do" things. The EBC has another issue in that it is a bleedoff boost control and with the skinny little lines it can only bleed-off so much pressure before some of the pressure ultimately pushes open the wastegate and starts that taper as you approach redline (or maybe the ECU does it... all I know is thay my FBC under utec control, with much bigger bleedoff lines has to try hard to maintain boost to redline)

The MBC is inline with the wastegate control line. It interupts to flow to the wastegate and so yea, it has more control. But as far as what it wants to do with that control, you can't change "on the fly".

With the TurboXS dual stage MBC you might be able to setup a situation where both are activated (high boost set at 17) and when you reach a specific RPM a shift light could turn the circuit off (back to low, say, 15) dropping boost.
* Registered users of the site do not see these ads.
2phless is offline   Reply With Quote