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

[swathdiver]

the weirdness even goes further I have been able to accelerate in V4 mode.
basically it will stay in V4 mode from 0 mph I can accelerate to normal speed...

yes the tac was revving more like a 4 cylinder then a 8


and M4 permanently keeps v8 mode on and AFM is disabled..

That's pretty cool. When AFM first came out in the 900s, the Avalanche guys using HP Tuners were tweaking the settings to have it run longer. The problem with the 5.3s is they really need to make an extra 5-6 horsepower per cylinder to move the duty cycle up from 10 to 50 percent or more in the SUVs.

 

[R3cord303]

Finished lowering down my hybro....hopefully this weekend get over to the exhaust shop...going with doug Thorley shorts
and converting to a dual cat back....score one for the hybro's!!

View attachment 233923

Looks great. Makes me really want to get the hybrid tails and D pillar trim

 

[DaRosa218]

This was Tuesday evening, but installed an OEM touchscreen Nav/no DVD head unit and OEM dash USB port and cover:

View attachment 174697

No XM signal cuz I was still in my shop, but everything seems to be fully operational. Haven't really played with the NAV much, either. I cut out a small metal plate to mount the NAV antenna in the factory location. It may just be my ears, or maybe I didn't spend enough time on the "EQ" adjustments, but I swear it doesn't have as good of sound as my original. Just gotta get a reverse camera now.

Did you go to the local dealer to unlock the vin theft lock? @iamdub

 

[Kee Fuller]

Plan on putting some tires on it at some point so you dont wreck those nice wheels?

rubberbands

 

[iamdub]

Did you go to the local dealer to unlock the vin theft lock?

No. I had Greg at CPS A/V in Cotati, CA unlock it for me.

 

[DaRosa218]

No. I had Greg at CPS A/V in Cotati, CA unlock it for me.

That's right, you mentioned that to me. Mind has been so busy I forgot. Funny part is it will turn on and play the radio for a few seconds then theft lock so I'm certain it will work with a vin reprogram

 

[iamdub]

That's right, you mentioned that to me. Mind has been so busy I forgot. Funny part is it will turn on and play the radio for a few seconds then theft lock so I'm certain it will work with a vin reprogram

I read too many horror stories of how easy it is for a dealer tech to not do something quite right and turn the HU into a brick. Also, many dealers won't program anything for any vehicle unless it's the original equipment. It was worth the price for the peace of mind of having a specialist do it and know it would be right.

That's odd that it even plays at all. Mine just powered up with a blue screen.

 

[Dropped HYbro]

Looks great. Makes me really want to get the hybrid tails and D pillar trim

man...the front end and rear remind me of 15'....people ask me what year it is all the time....it just has a different look to it
...the drop really makes it stand out....I think this one's a keeper for a while!....thanks for the likes everybody!

 

[wendal]

I am curious to hear your thoughts on the headers once you have it all buttoned up.

I forget... do you have a custom tune now or do you plan to get one??.

I have a Black Bear tune now, and will get them to update it once I get the header issue taken care of.

 

[gooffeyguy]

That's pretty cool. When AFM first came out in the 900s, the Avalanche guys using HP Tuners were tweaking the settings to have it run longer. The problem with the 5.3s is they really need to make an extra 5-6 horsepower per cylinder to move the duty cycle up from 10 to 50 percent or more in the SUVs.

When I got my 2012 last year and before I turned AFM off with a tuner, I noticed the truck would only go into v4 mode after letting off the gas. Even when cruising on the highway at a steady speed it would still be in v8, unless you lifted off the gas.

Seemed pointless to me, because minimal amount of fuel is used on decel anyway.

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

 

[Ilikemtb999]

Drivers motor mount, replaced the small trans cooler line rubber part and put vinyl over the gold emblems.

 

[Glisella]

thank you! Will try it in the morning. If you have a check engine light will that disable it? Because of being catless, I do have P codes, but I have the CEL for those codes turned off...

My '08 won't start with CEL on.

 

[Mickey_7106]

Cleaned the Maf sensor and the throttle body because it's been feeling a bit less responsive. Looked inside the intake manifold to see how much oil i had pooling but i couldn't cause of how it was designed. Never seen that. I remember on my ls1 i could see most of it.

How much would things change if the hole was bigger? Looks restrictive

 

[Glisella]

My '08 won't start with CEL on.

And I just looked at my keys, the back of my keyfob actually says how to start it, press lock then the arrow key.

 

[Ilikemtb999]

Drivers motor mount, replaced the small trans cooler line rubber part and put vinyl over the gold emblems.

Pics to go along with it.

 

[Doubeleive]

Pics to go along with it.
View attachment 233955 View attachment 233956 View attachment 233957 View attachment 233959 View attachment 233958

did you use the hummer mount?

 

[R3cord303]

did you use the hummer mount?

I’m not him but on mine I used the H3 mounts

 

[Ilikemtb999]

did you use the hummer mount?

Yes I did.

 

[iamdub]

Cleaned the Maf sensor and the throttle body because it's been feeling a bit less responsive. Looked inside the intake manifold to see how much oil i had pooling but i couldn't cause of how it was designed. Never seen that. I remember on my ls1 i could see most of it. View attachment 233953

How much would things change if the hole was bigger? Looks restrictive

It's there for a reason. It's been years since I read up on it, but IIRC, it's there to balance the air flow and volume because, at higher RPM/wider throttle, the air rushing in slams into the back of the manifold and builds up to create a high pressure area and those back two cylinders get a slightly stronger air charge.

 

[Rocket Man]

Yes I did.

Awesome, you shouldn’t ever have to do it again!