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

[Doubeleive]

i'm just over here like umm.... what's a good cat temp? lol, @80 mph mine are 1600deg's, idling for a bit there 7/800deg can't seem to find any definitive answer, can anyone with a tech2 take some data on there cat temps on the freeway and let me know what you are getting. just if you happen to be going somewhere or whatever, not trying to occupy anyone's time and no rush i'm just curious for my own piece of mind.

 

[kbuskill]

Funny, you bought your shorties based on promosing numbers from the webz...

This is partially true... I cannot argue with that.

I did try to base my decision on the fact that I was able to find 2 dyno tests from 2 independent sources that supported the manufacturers dyno results. They all showed a decent improvement over the stock manifolds with stock tuning and only an aftermarket "catback" exhaust system. The peak HP/TQ numbers are not huge... can't remember off the top of my head... but it was the 45 ft lbs gained between 2k-2500rpm that I was more interested in.

But anyways, i guess it all comes down to what you want to accomplished. I for one am always on the highway. I rather have power up top than dow low. Theres plenty of power to get this tank moving from a stop

Agreed... for me, I see very little interstate time so the added torque down low is welcomed when you have a long body Burb with a 5.3L.

 

[gooffeyguy]

i'm just over here like umm.... what's a good cat temp? lol, @80 mph mine are 1600deg's, idling for a bit there 7/800deg can't seem to find any definitive answer, can anyone with a tech2 take some data on there cat temps on the freeway and let me know what you are getting. just if you happen to be going somewhere or whatever, not trying to occupy anyone's time and no rush i'm just curious for my own piece of mind.

I will tomorrow or Sunday. What menu is that info under on the Tech2?

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

 

[Doubeleive]

I will tomorrow or Sunday. What menu is that info under on the Tech2?

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

diagnostics/powertrain/engine control module/data display/exhaust aftertreatment
in the aftertreatment data list it will show twc temperature

 

[swathdiver]

i'm just over here like umm.... what's a good cat temp? lol, @80 mph mine are 1600deg's, idling for a bit there 7/800deg can't seem to find any definitive answer, can anyone with a tech2 take some data on there cat temps on the freeway and let me know what you are getting. just if you happen to be going somewhere or whatever, not trying to occupy anyone's time and no rush i'm just curious for my own piece of mind.

I did it for you in June! See Post #585

https://www.tahoeyukonforum.com/threads/useless-information.97483/page-59

Remember, my motor is an LC9 5.3 and am running Magnaflow cats. Compared with mine, I think something is amiss, they are too hot IMO. Maybe Tom or one of the other 6.2 guys can run a scan and get an apples to apples comparison.

 

[swathdiver]

My last two fill-ups have been with 93 octane (due to low prices) and my alcohol % on this current tank is 0.0

Is it normal to have NO alcohol content in regular gas?

I am getting better gas mileage than usual though,... Lol

I've seen that a few times. Been running gasoline too and have been hovering around 4-5%. Saw that on another truck too recently, it was at 0% also.

 

[swathdiver]

I will tomorrow or Sunday. What menu is that info under on the Tech2?

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

Also in Fuel Trims section, cat temps are towards the bottom. Remember, they are not actual, but calculated based on O2 sensor readings. Close enough for our purposes I reckon.

Do you guys know you can select items to be viewed at the top of the screen? We often have the LTFTs, RPMs and MPH and Alcohol Content up top right after refueling to watch the motor settle in on a new alcohol content percentage.

 

[R3cord303]

Also in Fuel Trims section, cat temps are towards the bottom. Remember, they are not actual, but calculated based on O2 sensor readings. Close enough for our purposes I reckon.

Do you guys know you can select items to be viewed at the top of the screen? We often have the LTFTs, RPMs and MPH and Alcohol Content up top right after refueling to watch the motor settle in on a new alcohol content percentage.

On the way down to LA it seemed for me that the gas was 12.2% alcohol. I need to check again now that we’re back in oregon next time I fill up. Found it odd that it didn’t even move by 0.1 of a percent from two different fuel stations.

 

[Rocket Man]

On the way down to LA it seemed for me that the gas was 12.2% alcohol. I need to check again now that we’re back in oregon next time I fill up. Found it odd that it didn’t even move by 0.1 of a percent from two different fuel stations.

Oregon is supposed to be 10% but I’m not sure about Cali.

 

[R3cord303]

Oregon is supposed to be 10% but I’m not sure about Cali.

yeah Cali is also supposed to be 10%. Ethanols cheaper than gasoline though- so they all push it a bit.