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I would guess anything over 9lbs or so you'll have issues with.
I've had no issues up to 12# so far. I turned "the wick" up one week when I filled up on race gas. MY UTEC BCS held no problem around 11-12 psi.....I was paying too much attention.
Kevin, As we have discussed in the past.......I think the current programing of the BCS control is primarily designed to work with dual port wastegates (where the BCS si trying to hold the wastegate closed by sending a boost signal to the top port.) In actuated or sinlge port wastegate designs, the BCS would need to regualte in a manner as to restict any any boost signal going to the actuator. I truly believe that TXS needs another parameter in their programming to the BCS for compensate for single (actuators) or dual port wastegates.