very hard , only for a mile or so, i was trying to set the manuel boost controller, i am not having much luck i cannot get the boost to stay under 17, i feel that i have tried everything, i have a 14.7 spring in the wastegate and in the bov also, i haven't noticed the smoke today though
When driven hard, the turbo gets extremely hot (hence the smoke) very quickly. If you turn it off without giving it time to cool down, the oil just sits in the turbo and cooks. This is what people mean when they say 'coking'. This is a primary reason for turbo failures.
On the other hand, if you drive around for a few minutes before shutting it down, the oil circulates through the turbo and cools it off. Since the oil circulates (instead of just sitting there), it doesn't cook.
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