What did you do to your NNBS GMT900 Tahoe/Yukon Today?

[iamdub]

Obvious one is a full titanium exhaust

Nah. I've been wanting someone with a droning issue to try fixing it with tuned resonator(s). Basically, you calculate a formula to determine the length of tube(s) needed then weld it/them to your exhaust. You keep your muffler, it's volume, etc. but single out and attack the offending tones. I recently put a 14" muffler on my brother's truck and was actually hoping for drone. So far, he says there is none.

*EDIT*
It's called a Helmholtz chamber and it'd be something like this (internet pics):




It doesn't have to be straight the whole way, just 90° where it meets the main pipe.

Dual chambers (because dual exhaust on Mustang) :

 

[97audia4]

apparently I have rocket assist on a oem motor with just a blackhawk cai & 90mm tb, lol, last night it did finally bump up to 8.2

I got 10mpg towing a 5k extra height enclosed trailer at about 3500 to 4k rpm for 260 miles.

 

[HiHoeSilver]

Nah. I've been wanting someone with a droning issue to try fixing it with tuned resonator(s). Basically, you calculate a formula to determine the length of tube(s) needed then weld it/them to your exhaust. You keep your muffler, it's volume, etc. but single out and attack the offending tones. I recently put a 14" muffler on my brother's truck and was actually hoping for drone. So far, he says there is none.

*EDIT*
It's called a Helmholtz chamber and it'd be something like this (internet pics):




It doesn't have to be straight the whole way, just 90° where it meets the main pipe.

Dual chambers (because dual exhaust on Mustang) :

Think of the stock intake tube. Same thing.

 

[R3cord303]

Nah. I've been wanting someone with a droning issue to try fixing it with tuned resonator(s). Basically, you calculate a formula to determine the length of tube(s) needed then weld it/them to your exhaust. You keep your muffler, it's volume, etc. but single out and attack the offending tones. I recently put a 14" muffler on my brother's truck and was actually hoping for drone. So far, he says there is none.

*EDIT*
It's called a Helmholtz chamber and it'd be something like this (internet pics):

It doesn't have to be straight the whole way, just 90° where it meets the main pipe.

Dual chambers (because dual exhaust on Mustang) :

That's really ****** neat. I will look into this. I'm gonna take a welding course next term, and will look into doing that with the titanium exhaust.

Think of the stock intake tube. Same thing.

That's a great point. I was looking at my stock intake tube. Gonna cut that one off and JBweld the hole shut. I loooooove intake noise. With the cam, at higher RPM when the exhaust noise falls away the intake noise sounds like a space ship and I want more.

 

[Wolfbraid]

Oooh Rear brakes(powerstop), since stopping on the backing plates isn't the best idea.
Also adjusted parking brake while i was in there, yay I can park finally

The Tools I used....
BTW key tools
13mm socket,
20mm open end or vicegrips if you are like me and can't find your 20(if you own one)
18mm socket
Also that 10x1.50? pitch threaded rod again to pull rotor

The tools I thought I'd use...

 

[iamdub]

Think of the stock intake tube. Same thing.

Precisely.

 

[iamdub]

That's really ****** neat. I will look into this. I'm gonna take a welding course next term, and will look into doing that with the titanium exhaust.

That's a great point. I was looking at my stock intake tube. Gonna cut that one off and JBweld the hole shut. I loooooove intake noise. With the cam, at higher RPM when the exhaust noise falls away the intake noise sounds like a space ship and I want more.

I think there are two chambers- the one long one that runs alongside the intake manifold a short, stocky one in front, just above the water pump.

With these resonators gone, there's a chance the sound frequencies from the intake will interact with those from the exhaust. It could cancel out some notes while amplifying others. It may remove some of your drone or just move it to another RPM or make it worse. I loved the sound of my Airaid MIT and wasn't very concerned with getting a louder muffler because it sounded so good. After the muffler, I could barely hear the intake any more. Inside the car, the muffler was about the same volume as stock and since it cancelled out the intake sound, it was like I had a stock Tahoe again. After a few hundred miles, the muffler broke in and got a little louder and the exhaust note changed. The new frequencies of sounds coming from it no longer cancel out the deep intake growl, so now I hear both.

I forget who makes it, but either JB Weld or Loctite has a black epoxy for plastics that I can't say enough about. I've fused headlight mounting tabs with it and it feels just as strong, if not stronger than the original plastic. It'd be perfect for deleting the intake resonator chambers.

Are you able to take vids? Before and after vids of how it sounds inside would be cool.

 

[R3cord303]

I think there are two chambers- the one long one that runs alongside the intake manifold a short, stocky one in front, just above the water pump.

With these resonators gone, there's a chance the sound frequencies from the intake will interact with those from the exhaust. It could cancel out some notes while amplifying others. It may remove some of your drone or just move it to another RPM or make it worse. I loved the sound of my Airaid MIT and wasn't very concerned with getting a louder muffler because it sounded so good. After the muffler, I could barely hear the intake any more. Inside the car, the muffler was about the same volume as stock and since it cancelled out the intake sound, it was like I had a stock Tahoe again. After a few hundred miles, the muffler broke in and got a little louder and the exhaust note changed. The new frequencies of sounds coming from it no longer cancel out the deep intake growl, so now I hear both.

I forget who makes it, but either JB Weld or Loctite has a black epoxy for plastics that I can't say enough about. I've fused headlight mounting tabs with it and it feels just as strong, if not stronger than the original plastic. It'd be perfect for deleting the intake resonator chambers.

Are you able to take vids? Before and after vids of how it sounds inside would be cool.

Will for sure take some videos. My 07 is different than the 08+ ones. Doesnt have the boxy one above the water pump, it has what I can only describe as an acorn looking one right in front of the passenger side head, and then the long skinny ‘rails’ down the intake runners. I’ll post a pic later today.

 

[iamdub]

Will for sure take some videos. My 07 is different than the 08+ ones. Doesnt have the boxy one above the water pump, it has what I can only describe as an acorn looking one right in front of the passenger side head, and then the long skinny ‘rails’ down the intake runners. I’ll post a pic later today.

I may be confusing the GMT800 intake duct with the GMT900 one. Anxious to see (hear?) the outcome!

 

[R3cord303]

I may be confusing the GMT800 intake duct with the GMT900 one. Anxious to see (hear?) the outcome!

Here’s the only video I have on phone from inside the cab- from when I was still trying to figure out how to raise the shift points. I’ve now figured out what I was doing wrong in the tune but it will give you some idea of how it sounds