I am trying to find a suspected leak as I have some additional turbo noise that I didn't have before. But around the same time I installed a tune and haven't been able to return to stock yet (new to the Spade (autocal) and the directions provided doesn't include a way to return to stock. I've requested the stock file from the tuner as well as my purchased tunes (as I'll need those later to modify when I delete).
In my reading of this forum yesterday I read something about a "whislter" tune and wondered if that could have been possibly implemented into my tunes and is causing the sound. I would be fine with this as I am only concerned if there is a leak.
Here is some videos of what I am experiencing:
Here is a picture of the guide vane arm (I am assuming this is the arm and servo motor) position at idle: (I realize this is a crap picture with the shadow, but you can see the arm is "fully extended" if you will, meaning, looking from the front of the truck, it is in the furthest counter clock wise position it can go).
So here are my questions:
Does the guide vane position look like it is "open" creating the whistle that I am hearing in the videos?
I can here this on start ups too, it isn't just under load, so this leads me to think this is still a leak I am chasing.
I have pulled both the hot and cold side pipes post turbo and inspected them and didn't see any signs of leaks. I realize though that this sound could be from a very small leak.
Another thing I notice, on cold start up, I see signs of a very small leak were the "guide vane control arm" goes into the exhaust side, can anyone confirm if this is normal? Water drips out when it first starts up (condensation), also, you can see some small "exhaust marks, black" on the turbo housing.
2016 Colorado LT Diesel
Red Rock, Sports bar, Black 5" assist steps, EGT and Boost Gauge with custom bezel mount
AFE Magnum Intake and Bladerunner Hot/Cold side Kit
Duramaxtune DSP-4 Tuning
AFE Rebel side exit turbo back w/ Black tips