If it was the oil seals in the turbo you would have smoke under acceleration too. Having said that have you had someone follow you to make sure you really aren't smoking under acceleration and off throttle moments? I ask because we regularly black flag people at the track for smoking while running that they never see or notice because it is dispersed so quickly at speed. Also unless it's just pouring out most drivers never know. I would also recommend that you do drive byes for your observer. It's much easy to spot smoke coming out when it's framed by the background and not the back of your car.
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