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Power suck right before secondaries open?

On a 3L with the secondaries disabled and held open the low end is going to suffer. IIRC, timing needs to be added when this is done in the lower rpm range.

As I recall the secondaries soft open around 4k rpm under easy driving conditions and ~3750 or possible 3500 rpm under hard driving.

I would say a slight dip in power is normal due to having the change over occur. Look at the dyno plots for my 3L turbo, there is a slight dip in power just before the secondaries open and then the curves continue like they where. So not sure how it would get tuned out.
 
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