Compression Ignition Addict
Join Date: May 2011
Location: Wallburg, NC
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"Whistle" from 4psi to 7psi
straight pipe exhaust
So i have the typical 6.0 sweet sounding whistle and exhaust note. This is NOT it.
I'm towing my 20ft enclosed home from the mountains after a day of riding dirtbikes at Brushy at hiway speeds. 2k rpms 70mpg using cruise on 4 lane empty hiway that goes up and down hills.
When turbo boost is over 7 psi and under load....it's whisper quiet in the cabin. but on flat straights with low load and boost between 4psi and 7psi I hear this slight and consistent "whistle" that does NOT change pitch. but occurs every single time I'm between 4-7 psi
It's kind of irritating...but there doesn't seem to be any effect to the motor or power. I can make this whistle go away with a touch of gas.
70 miles later the whistle is now LOUDER but still only occurs between 4 & 7 psi under mild load and never on deceleration...only acceleration.
After 100 miles it's so loud I can't believe it. and as I pull the truck in the garage at home it sounds like a tornado siren.
What the hell has happened?
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Straight piped, SCT tuner, CTS Insight, TU EGR delete, V-tek blinker fluid, Advanced Adapter Muffler bearings