| With the Turbogaurd they are not a boost limiting valve. They are there to dump the pressure in off throttle surge situations. We are using the solenoid to direct boost to the top of the valve to hold it closed. When you chop the throttle the control module we have senses how much throttle you have let off and then tells the solenoid to direct the boost to atmosphere allowing the boost in your intake track to push the valve open spilling off the pressure.
If you are just directing boost to it, you are then just relying on the spring tension to hold the valve closed. You don't have the same control over it opening.
As for the mass air sensor issue you really don't have an issue in a diesel. In gas cars, yes because you are ideally trying to maintain the 14.7-1 ratio, a diesel it really isn't going to matter as much as it is just going to be a momentary rich that would just make a little smoke. When it activates you are already backing off the throttle which is going to drop the amount of air the mass air is processing and the valve itself is opened and closed so quickly that the boost will just drop a little quicker than if you didn't have the valve. Is this making sense? I can see what is being said about going rich, but that really should only have an affect of gas cars. | 
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