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Re: Viggen overboost/Dean
Posted by Dean (more from Dean) on Tue, 16 Sep 2003 19:39:01
In Reply to: Re: Viggen overboost/Dean, ed smith, Tue, 16 Sep 2003 15:22:12
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Between the BPC and WGA.... It might be better between the compressor hose barb and the PBC, with its bleed orifice sealed. The PBC has an inlet restrictor and it own bleed port, and the MBC has one too. The PBC may simply be out of its range to cope. The ECU may also be seeing the PBC duty cycle and be freaking out about that too.
And the strong WGA may be a problem as well. You don't need that. The SMBC is keeping the WG closed when it needs to be closed. You are right about the problem opening the WG.
So move the SMBC, block its bleed port, and perhaps install a stock WGA, or is that WGA needed to get the pressure that the modified ECU supports?
Not your story, but some nice analogies:
With a MBC, I saw two possibilities to get the WG open faster. Adjust the WG soft, or pre-presssurize it. For a MBC you do not need a hard WGA, you need a softer one. The MBC is creating the higher boost. And its hard to make changes to the WGA, turning a APR knob is easy and fewer burns. Search and read drs<underscore>anticipator on the 9-3 and perf BB's if you want more on that.
posted by 65.68.102...
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