[chris t]

After replacing the exhaust, loading my tune, and unplugging EGR, I have the following sound out of the exhaust when I start my truck in the morning, cold. When it's warm, it does not make this sound. Flo-Pro down tube back exhaust with a 30" FTE resonator placed behind the straight pipe out of the down tube. I hosted the sound on my soundcloud account - https://soundcloud.com/drummin_man44/truck-bus-saw. Any thoughts why it sounds like a table saw?
By the way, the truck is 100% better after the delete. I will be pulling the EGR off this weekend.
Thanks
Chris

 

[chris t]

It's not under the hood, only through the exhaust. Would those other items come through?
Chris

Yea Table saw is good description, never heard a truck like that before. Got get your stethoscope out. Listen to things turning very fast, Turbo, Alternator, other pullies, Trani input and TC. Sounds a lot faster than engine rpm alone.
Load on alt may le tup from charge after start. Turbo blade or bearing. may be , pull hose and listen.
Maybe a boost, exhaust or other leak after delete.

 

[chris t]

Yeah, I need to check the torque on the bolts, but it went in really clean, Nothing was touching anything. At first I thought I put the resonator in backwards or something. I was hoping someone heard this and recognized the sound. I'm going to check the position of the turbo vanes when I start it warm and compare that tomorrow when I start it up.

BTW, you nailed it with the description of a table saw, I wasn’t expecting the sound clip to sound like that but I’ll be damned

 

[chris t]

I was watching the turbo speed this morning, and noticed that when first started, it sat at 8,000RPM. You could hear the whine. If I turned the exhaust brake on, the turbo spooled up to 12K, then back down to 8. When it hit 12K, no noise. On it's way back down to 8k, it started to whistle, and then oscillate a bit. Once warmed up, it was at 18K RPM at idle. I'll check the VGT position tomorrow. I forgot about that today.

 

[chris t]

Hi Norm,
It was the tune. After going through everything I went through to get it resolved, I sent another note to the tuner and asked if he had any ideas. He said he had programmed it in as a "feature" for his tunes. Apparently he had never been in a campground leaving at 6:00 AM and trying not to wake up your neighbors with your table saw exhaust note. Had I known that before hand, I never would have purchased the tune from him. Try reaching out to your tuner and ask them. Send them my sound file if you need to.
Chris