Drive / Boost differential pressure ??

[smenard]

I have been reading a lot lately about blow off valves to eliminate turbo bark since my turbo started barking recently. I am trying to figure out a way to open a TIAL blow off valve (same valve used with BD's BOV) automatically using a differential pressure switch monitoring Drive and Boost pressure to regulate vacuum pressure to control the valve.



I am just thinking out loud here. I really don't know enough about the relationship between drive and boost pressures to know if i am on the right track or not. Fuel is required to create drive pressure. It requires Drive pressure to create boost. Boost should ideally be at a 1:1 ratio with drive pressure but most likely boost pressure trails drive pressure slightly?? The only time boost pressure will be higher than Drive pressure is when quickly defueling the engine or changing engine RPM quickly which is when i am hearing turbo bark.



I am thinking that i can install a differential pressure switch on the Drive and Boost pressures that will open a valve to a vacuum line to operate the blow off valve when the boost pressure is a preset amount higher than drive pressure.



I don't know if i can find switches and valves that will operate quick enough to relieve the pressure in time to prevent the bark??



Let me know if you think my logic is flawed or if you have any comments, corrections, or ideas.



Thanks,

Seth