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That sounds like a wastegate dumping pressure. The real question is why would there be so much raw (unused) fuel in the exhaust to cause a flame when dumping. I don't know the Bi-turbo Audi setup. Does it use integral w.gates on either turbo or one big seperate unit? Would a bad fuel injector sitting for an hour or two pass enough fuel to richen the charge so much that on the startup it would have vent pressure ?
Did it have a hard time starting?
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Weaver
'88 911 Targa
'03 911 Turbo, X73 Susp.
'13 Panamera GTS
PCA member Central Indiana
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