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The only practical way to control timing is to offset the crank position sensor. The JB3 doesn't do that. BMS has indicated that the JB3 does retard timing at high boost but they have refused to identify how. The JB3 does not change the CPS signal in anyway. The only other way I know to retard the timing would be to scale the IAT but that would change fueling and other parameters. It is suspicious that BMS claims they retard timing yet do not provide data to support the claim or even a qualitative description of how the timing is controlled.
As far as whether you should retard timing when increasing (doubling) the boost, that isn't a question for anyone who knows anything about tuning. Relying on the factory knock sensor to keep you motor in one piece at double the factory boost is, well, you fill in the blank...
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