We all know of people that have blown their engine due to boost spikes/creeping due to weather, wastegate actuator failures, falls boost system readings, and midpipes

why not for an extra backup measure, make extra use out of the expensive BOV valves that simply dump air but creating some time of boost sensing vaccuum activator that will open the BOV after a certain desired boost level is passed

all that would be required is some kinda of senory device that runs off of the cars boost signal line that will pull its own vaccuum on the bov or activate an electron spring release on the BOV in an override situation

does this make any sense to anyone?

 

it makes sense yes, but the problem is finding a vacuum source when the engine is under boost. i know diesels (like mine) have a vacuum pump since diesels don't have vacuum. if you had some sort of canister you could charge that would hold vacuum you could route a flow control solenoid between the bov and the intake manifold that will switch it between manifold boost and the canister vacuum. all it would take would be the canister, some hose, a hobbs switch, and a flow control valve with two inputs and one output ( like the boost control solenoids in most electronic boost controller kits. the trick would be to make the canister under vacuum during idle and have a check valve to prevent the vacuum from escaping when the throttle is open. that way if the car idles any it will charge (or remove if you will) the atmosphere in the canister. when you overboost the car the hobbs switch will sense it and send voltage to the flow control valve that will switch the blow off valve to vacuum on the diaphragm side and open it momentarily. the bigger the vacuum canister the longer it will open. this should give you enough time to get off the throttle.

 

Pop off valve

 

only problem with a pop off valve is the only place i have ever seen one is on a turbocharged airplane with a pressure cabin (recip, not turbine powered). other than that i have not the slightest clue where someone would come across one of those. as cheesy as it might sound this could be something useful if the temperature is really cold and the air super dense. since pressure is a pretty vague term in boosted cars since you have other variables like outside air temp and humidity. the system could be put on a switch and if a higher boost is warranted (like running race gas) the system could be eliminated. just a neat idea. i drew a plan for this earlier in paint just sitting around bored, but its just an idea.

 

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-Ted