Quote:
Originally Posted by gpl1968
If you dump metered (by the Air Mass Meter) air to atmosphere you will cause more problems as the ECU will make the mixture too rich as there will be less air in the system than expected.
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It won't cause any problems dumping metered air, the engine does not remember or know the air is pressurised. It just assumes the amount going into the engine is the amount going into the MAF.
In my understanding (which isn't perfect) I think the engine ignores the MAF during idle, but doesn't like it being disconnected. Therefore you could use a CBV (always open in idle) open to the atm rather than a temporary opening dump valve or connecting to pre-turbo pipe work. The valve will close when off idle and the air will be measured via the MAF as normal. I'm not sure though.
The MAF may take a little longer to react to the bigger step increase in ait flow when the valve closes for power.