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Old 11-28-2012, 11:52 AM   #656
Scooby Specialist
Member#: 73932
Join Date: Nov 2004
Chapter/Region: RMIC
Location: Denver
2005 STi BROtuned
2004 S2000


Originally Posted by MRF582 View Post

If you want to open the wastegate more, you reduce WGDC which diverts less to the inlet and more to the WG. Otherwise the pressure gets diverted to the inlet pre-compressor and whatever slight pressure loss you have post compressor, translates to a pressure gain pre-comrpessor. Running it to the 'inlet' really is the most optimal way. Period.

If you lower the WGDC, it will open the port more directly to the WG diaphragm via the EBCS. 100% WGDC should put the MBC solely in the loop for boost control.


0% = Spring pressure
100% = MBC
1-99% = Boost control anywhere between spring pressure and MBC.

It works.

The only optimal way I've found after countless cars is the way Grimmspeed recommends. Using the inlet caused overboosting as I was essentially using the inlet vacuum to lower the pressure on the line needed for opening the WG.
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