thesameguy wrote:
Just for my understanding, what are you referring to when you say "letting pressure go?"
The thing that BPV/BOV usually solves is compressor surge (sometimes called flutter, I think) which occurs in moments of high pressure and low flow. The common scenario for this is going to be a gasoline engine where the throttle plate snaps shut (like during a shift) and there is still high pressure between the compressor and throttle plate but little to no flow. That's this:
Aside from being bad for performance, it's also very hard on a compressor. Moving that direction on the map creates a reaction force against the wheel slowing it down. It also puts a massive thrust load on the turbo's bearings and fatigues the surface of the compressor wheel. Over time, it will wreck the bearings or start tearing the wheel apart.
On a diesel, X rpm = X airflow no matter how you slice it, right? I don't really understand how you can get this high pressure / low flow scenario to unfold on a diesel. It's a bit baffling to me!
I'm with you for the theory, no problem with that !!! X rpm = X airflow !
But sometime it's a little more complicated than that.
Geordi with his Jack of all trades explanation doesn't help at all.
And again I worked on a high HP diesel racing truck using a massive BOV !!!!!
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