I just did a grid heater delete, and now, when I pass someone when the turbo spools up, it almost sounds like the wheels in the turbo are scraping on the housing.
When I let off the pedal, it returns to a whistle.
I have an S&B air intake that has been deleted with straight 4” pipes.
I’m wondering if the turbo would do this if there is not enough back pressure on the turbo.
There are no other issues, lots of power, EGRs are running about 600-800, no codes, and I have seen boost get up to 35 psi.
The turbo, intercooler, and intake horn are in stock; delete the plate.
The truck has 112,000 miles.
Any input would be appreciated.
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