Quote:
Originally Posted by AmuroRay
This is pretty extreme assumptions being made. People have run intakes on these cars and PWGs for over 10 years, and how many people have seen their turbo go? I would say it’s an issue that could have been there before the intake, and if it’s from the intake - no one stateside uses a foam filter.
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The damage patterns on the leading edge are indicative of impact strikes, they're exactly the same pattern as what you'd see from pre turbo water injection where the water droplets striking the compressor causes damage. That combined with the knowledge from UOA's showing drop in filters (foam or not, because there are oil analysis showing simple high flow drop in panel filters letting alot more dust in as well, and this is likely because these high flow filters in order to get more flow with the same surface area as stock have to increase filter pore size), allowing more dust particles in is quite evident it is dust causing the damage. So in OP's case it's likely the foam filter was just not as good enough and the particle size let through was just too big. For cotton high flow filters that have been used for a long time, the particle sizes let through aren't big enough to cause issues but they still let dust in as shown by UOA's, which is never good for the engine.
Pre turbo water injection damage:
