I know that recirculating BOVs are designed mostly for engines using an AFM or MAF-based engine management system in order to keep 100% of measured air in the intake and prevent rich conditions, but what about MAP-based systems? Are there any benefits to running recirc on a Megasquirt system? Or conversely are there benefits to running the BOV with atmospheric dump instead? I have a Turbosmart Hybrid BOV that has ports for both atmo and recirc, and I'm wondering which would be better to use.
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Doesn't really matter to my knowledge, I am running a map sensor with megasquirt and a greddy BOV to atmosphere. Mostly for the baller blow off noise. But mine is set so hard the turbo tends to just surge coming off WOT.
Originally I was running a bypass valve with a chip tune from Jakeb, that had the AFM still and I needed the bypass valve otherwise the car would run toooo rich at idle and die.
You can run an AFM on megasquirt, so if you wanted to you could tune your car like how most cars come factory with a bypass valve and AFM on the turbo intake. You can also run the map sensor from megasquirt with the bypass valve setup routing it back to the turbo intake side, but you'll have less plumbing just sending it back to the atmosphere. The map sensor is only taking input from the manifold and since you're relieving pressure in the charge piping so that the turbo doesn't surge and you don't blow an intercooler pipe off doesn't matter what you decide to do. Hopefully that helps you out and made sense lol -
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Since MAP reads pressure and not flow, there's no point to running a BPV (bypass valve).Comment
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Just noizes.
All OEM configs are re-circ for less noizes.
1991 325iS turbo
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More likely for emissions reasons. The boost piping and intake must be a closed system.Originally posted by ak- View PostComment
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