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Discussion Starter · #1 ·
Is that ok? After letting of the revs from 6k revs, a puff of black smoke appears, quite shortly after, I mean after the revs have completly dropped???
I understand black as fuel?

Thank you
 

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Normal. :)

It's a result of the flow through the AFMs lagging slightly behind that through the throttle butterflies. So, when you close the throttle, true airflow drops instantly, but as the turbos are still spinning there is a fraction of a second where the AFMs are still metering air, so there is transient overfuelling resulting in the black puff of smoke from the exhaust.
 

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Discussion Starter · #3 ·
Normal. :)

It's a result of the flow through the AFMs lagging slightly behind that through the throttle butterflies. So, when you close the throttle, true airflow drops instantly, but as the turbos are still spinning there is a fraction of a second where the AFMs are still metering air, so there is transient overfuelling resulting in the black puff of smoke from the exhaust.
Thank you, thank you, thank you :bowdown1: Im so very relieved
 

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so, if it may be caused by VTA BOV's, do you suggest going back to recirc.
std BOV's to resolve this issue?
 
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