1. Talked to a guy at FAST which said it had to be at least 8". Seemd like a "political" answer.
2.Read an article with a FAST engineer who said that you could run down to 7" but had to start with a bit higher idle speed when thuning the system and then gradually take the idle down.
= Confused.
So if anyone has hands on experience it is appreciated.
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Stale Feroy (Norway)
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"If you're under control you're not going fast enough"
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