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

[Rocket Man]

ACC FTW. I've used their products quite a few times. Quality stuff.

I even contacted OC to make sure they’re ACC products I was buying and they said they were. And the packages are shipping directly from ACC according to the tracking. I have always used ACC stuff, always fits great.

 

[swathdiver]

A buddy that tunes has mentioned it to me a few times over the years. ...You know anything of this?

Nope. Maybe @randeez Randy does.

 

[BG1988]

A buddy that tunes has mentioned it to me a few times over the years. My fill-ups happen every 3-4 weeks, so I just thought it was the older gas going a little stale. I'm always feeling more response and "oomph" after filling up so I've never really questioned it. The basic story as I understand it is that a timer (of sorts) runs from a fill-up event and the PCM adjusts accordingly if X amount of time passes without the float arm in the tank going back up. I doubt it has to be a complete fill-up, I'd imagine it to be a sustained specified percentage higher than where it was for it to switch tables. IIRC, he said its purpose was to account for the fuel losing some of it's octane rating as it sits.

You know anything of this?

I'm not buying that I used 1 year old gas with no issue or power loss....it was E10 fuel as well 91/93 octane is the lest used so it could have been sitting in the tank for a while for many many months.. without a reload... they put in 5-6k gallons at a time. when you see a double tanker one is 91/93 the other 87 any other grades are blended at the pump

 

[avalonandl]

I'm not buying that I used 1 year old gas with no issue or power loss....it was E10 fuel as well 91/93 octane is the lest used so it could have been sitting in the tank for a while for many many months.. without a reload... they put in 5-6k gallons at a time. when you see a double tanker one is 91/93 the other 87 any other grades are blended at the pump

Where do you come up with one year versus 3-4 weeks of time between fillups? Vehicle tanks are vented thru a controlled system, not open venting. I store my boat over winter with premium (non-ethanol) over the winter with no loss of power.

Also stations get regular tanker fills so they have fresh fuel to blend the 93 to get 89 octane. Not months without delivery.

The PCM checks for knock and then adjusts to a lower table if needed.

 

[randeez]

Nope. Maybe @randeez Randy does.

no idea

 

[swathdiver]

no idea

Ok, thought you might have come across that while tuning.

 

[randeez]

Ok, thought you might have come across that while tuning.

Nah tank in mine only lasts about 3 days max

 

[BG1988]

Where do you come up with one year versus 3-4 weeks of time between fillups? Vehicle tanks are vented thru a controlled system, not open venting. I store my boat over winter with premium (non-ethanol) over the winter with no loss of power.

Also stations get regular tanker fills so they have fresh fuel to blend the 93 to get 89 octane. Not months without delivery.

The PCM checks for knock and then adjusts to a lower table if needed.

on the 5.3 push rod 93 will not make much difference unless in AFM mode.. that is the only thing it will improve .

unless it's a gen5 with vvt or gen4 4.8l/5.3/6.2l with vvt

another thing is Many gas stations will scam you and give you 87 octane at the 91/93 pump
it happened at 6 gas stations i went to. AND they were name brand stations BP/arco and Shell stations...

the only way to verify it is checking the ignition timing. with the obd2 reader...when it happens .. That is how i figured out they scammed me...


91octane can get upto 42 degree advancement mid 30s on average....
AFM can run long periods at 12-16 degrees advancement.


93octane can get upto 42 degrees advancement high 30s on average


87 octane could barely do -12 to 12 degrees advancement
no AFM may cause knock or loop of death





i had fuel sitting in my car for a year when the tras went out it still started

used as the neighborhood bait car as there was a string of break ins caught them on the 3rd time (left the door open with the alarm on) they got too greedy.

 

[07Burb]

If you're filling up with good quality gas, it takes longer than a month for it to go bad/"stale". You can let good gas sit for 3-6 months without any issue at all.

 

[The_Burban]

I got them from www.ocautocarpets.com. Last time I ordered from www.stockinteriors.com but they’re both distributors for ACC (Auto Custom Carpets) who is the manufacturer. OC was cheaper by about $50 shipped on the carpet which paid for half of the mats that have a maroon bowtie embroidered in them. I went with plush pile carpet with mass backing for maximum thickness.

Thanks for supplying the provider.. I've looked at the other website before. This is something I'd like to do.

Will you photodocument the process. Seems easy enough. I can live vicariously through you for the time being

 

[Rocket Man]

Thanks for supplying the provider.. I've looked at the other website before. This is something I'd like to do.

Will you photodocument the process. Seems easy enough. I can live vicariously through you for the time being

It will be in my build thread, link is at the bottom of my sig. Turn your phone sideways if you don’t see it. It’s the one for the bagged Silverado.

 

[R3cord303]

Anything with VVT, stock will benefit from higher octane fuel.

Anything with forced induction, stock, will benefit from higher octane fuel.

Anything at all being custom tuned will benefit from higher octane fuel.

 

[iamdub]

If you're filling up with good quality gas, it takes longer than a month for it to go bad/"stale". You can let good gas sit for 3-6 months without any issue at all.

I figured as much. But I swear I can feel a difference right away after refilling. I'm pretty in-tune with my Tahoe and can't convince myself that it's just in my mind. According to my friend, it's not that I had stale gas and now have fresh gas. It's that the PCM switched octane tables.

I asked him to give some specifics and/or validating links to info on this.

 

[iamdub]

Anything with VVT, stock will benefit from higher octane fuel.

Anything with forced induction, stock, will benefit from higher octane fuel.

Anything at all being custom tuned will benefit from higher octane fuel.

During hot weather, mine will detonate a little when I'm romping on it if I don't have 91-93 in it.

 

[R3cord303]

During hot weather, mine will detonate a little when I'm romping on it if I don't have 91-93 in it.

Heat soak? I’m thinking about insulating the tube and the manifold after I have my charge air resonator delete done

 

[swathdiver]

I figured as much. But I swear I can feel a difference right away after refilling. I'm pretty in-tune with my Tahoe and can't convince myself that it's just in my mind. According to my friend, it's not that I had stale gas and now have fresh gas. It's that the PCM switched octane tables.

I asked him to give some specifics and/or validating links to info on this.

Well, what is certain Chris is that as soon as the computer detects a refueling event, it starts trying to determine a new alcohol content. If you've ever looked at your fuel trims right after leaving the gas station, you're eyeballs will go wide as they can hit -25 for a few miles while it's sampling. So this will certainly make an engine have a little more pep in its step.

 

[trailblazer]

Once in my trucks lifetime moment:

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[wjburken]

Once in my trucks lifetime moment:

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Cool! I thought I was the only person who took pictures like this until I started hanging out on this forum. My wife just rolls her eyes and shrugs her shoulders at me.

Just think, in 530,865 miles you can get a picture with the numbers reversed!

 

[gooffeyguy]

Well, what is certain Chris is that as soon as the computer detects a refueling event, it starts trying to determine a new alcohol content. If you've ever looked at your fuel trims right after leaving the gas station, you're eyeballs will go wide as they can hit -25 for a few miles while it's sampling. So this will certainly make an engine have a little more pep in its step.

I was thinking the same thing

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

 

[Rocket Man]

Ordered a hidden console sub box, 10” JL sub and amp to go along with the new dash, Esky cluster, console, carpet and Katzkin leather. I’m on a roll.