Post Your Cool Feature Discoveries On Your T1

[kodiakdenali]

On 9/12/2020 at 7:21 AM, Jav_eee said:

 

Well after 382 gallons logged in 21 fuel-ups I can confidently say my dash estimate is incorrect.


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I sincerely don't want to start an argument here, but it always makes me wonder when I see these kinds of claims, what makes you think your hand calculations are accurate and therefore the DIC is not?

MPG average over time is a pretty simple calculation, distance traveled divided by fuel quantity used.

I don't know about these new trucks but the last time I calculated the resolution of a car's ability to know how far it has been driven it was accurate down to a resolution of 1.3 feet (this was a late 90's Chevrolet) now that is based on wheel rotations and has some degree of inaccuracy due to exact tire size, wear on the tread, inflation (varies with temperature), flex of the tread during acceleration, deceleration, turning etc. but if you are using the trip meter to calculate distance traveled, you have exactly the same inaccuracy, and a resolution of 528 feet, way less than the truck's PCM. Using a separate device to calculate distance traveled would be better, but you'd need military grade GPS to match the PCM's resolution.

I don't know how the truck knows how much fuel it has used, if its based on a separate fuel flow sensor integrated over time, or if its based on the fuel pressure and known properties of the fuel injectors plus fuel delivery information or what, but whatever it uses it is accurate enough to put the right amount of fuel into the cylinders to result in a proper stoichiometric air/fuel ratio. If you are using how much fuel you put into the tank at each fill up as a measure of how much fuel was used, your number there also is massively less accurate than the PCM. To start with you'd have to be using exactly the same fuel pump each fill up, with the vehicle in exactly the same position on the pad, exactly the same temperature/humidity conditions and you must operate the fuel pump in precisely the same way to only be 100 times less accurate than the PCM (no not literally, just making the point) That pump also would have to be exactly accurate and its calibration never changed over the time you're doing your calculation. The fuel pump also only gives you fuel filled (Which is not the same thing as fuel used) to 0.001Gal, that's 3.8mL resolution, I can't believe the PCM can run the engine correctly without knowing how much fuel its putting into the cylinders with way more accuracy than that.

The only thing in favor of everyone who believes their hand calculations are a perfect average MPG and therefore the DIC is wrong is that I'd expect all of the above to result in your numbers being off from the DIC in both directions, above and below, yet most report consistently that their numbers show a poorer fuel economy number than the DIC. I'm not sure what to make of that, but I personally trust the accuracy of the DIC over hand calculations any day.

Edited October 21, 2020 by kodiakdenali
typo

[Duramaxsky]

The a/c drip on the pipe is so annoying. I hear it every time i get out of the truck and it bothers me every time


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I guess I am just over it. It used to upset me with my Corvette. When I heard it on the new truck I just thought great another one.

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[Duramaxsky]

I sincerely don't want to start an argument here, but it always makes me wonder when I see these kinds of claims, what makes you think your hand calculations are accurate and therefore the DIC is not?
MPG average over time is a pretty simple calculation, distance traveled divided by fuel quantity used.
I don't know about these new trucks but the last time I calculated the resolution of a car's ability to know how far it has been driven it was accurate down to a resolution of 1.3 feet (this was a late 90's Chevrolet) now that is based on wheel rotations and has some degree of inaccuracy due to exact tire size, wear on the tread, inflation (varies with temperature), flex of the tread during acceleration, deceleration, turning etc. but if you are using the trip meter to calculate distance traveled, you have exactly the same inaccuracy, and a resolution of 528 feet, way less than the truck's PCM. Using a separate device to calculate distance traveled would be better, but you'd need military grade GPS to match the PCM's resolution.
I don't know how the truck knows how much fuel it has used, if its based on a separate fuel flow sensor integrated over time, or if its based on the fuel pressure and known properties of the fuel injectors plus fuel delivery information or what, but whatever it uses it is accurate enough to put the right amount of fuel into the cylinders to result in a proper stoichiometric air/fuel ratio. If you are using how much fuel you put into the tank at each fill up as a measure of how much fuel was used, your number there also is massively less accurate than the PCM. To start with you'd have to be using exactly the same fuel pump each fill up, with the vehicle in exactly the same position on the pad, exactly the same temperature/humidity conditions and you must operate the fuel pump in precisely the same way to only be 100 times less accurate than the PCM (no not literally, just making the point) That pump also would have to be exactly accurate and its calibration never changed over the time you're doing your calculation. The fuel pump also only gives you fuel filled (Which is not the same thing as fuel used) to 0.001Gal, that's 3.8mL resolution, I can't believe the PCM can run the engine correctly without knowing how much fuel its putting into the cylinders with way more accuracy than that.
The only thing in favor of everyone who believes their hand calculations are a perfect average MPG and therefore the DIC is wrong is that I'd expect all of the above to result in your numbers being off from the DIC in both directions, above and below, yet most report consistently that their numbers show a poorer fuel economy number than the DIC. I'm not sure what to make of that, but I personally trust the accuracy of the DIC over hand calculations any day.

On my 2020 6.2 it real close. I used an average over 5 fill ups on a trip. It was the same. My Duramax is way off. By 3 or 4 MPG. Has been since it was new. And yes it is worse than the DIC. Most people on the Duramax forum call them dash liars.

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[Duramaxsky]

I don’t agree with German engine and trannys at all. The newish jettas are plagued with a grinding noise at rpms. 

I agree. My brothers Mercedes are all problem children. Especially the supercharged AMG. He got it so he would have something faster than my Vette. Didn't work. The Vette smokes it. I doubt it will outrun the 6.2 Trail Boss. At least to the speed limiter. But it's an expensive to fix problem child.

 

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[GMC207]

On 10/19/2018 at 10:59 AM, DougFL said:

On the Silverado powered tailgate you only need to touch the dash switch or tailgate button once to open.  The key fob requires you to press the tailgate button twice to open.  To close the tailgate remotely you have to press the dash button and hold until closed.  The key fob requires you to push the tailgate button twice and on the second push to hold the button down until the tailgate is fully closed.  Found this out after my dealer told me you cannot close the tailgate remotely!

wait, it closes itself too?! How do you know you if you have this option? 

 

Edited October 27, 2020 by GMC207

[fsuboy75]

5 hours ago, GMC207 said:

wait, it closes itself too?! How do you know you if you have this option? 

 

 

[Transient]

wait, it closes itself too?! How do you know you if you have this option? 
 

Step 1) Have an LTZ or High Country
Step 2) .... I haven't figured this part out yet.

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[GMC207]

2 hours ago, Transient said:

Step 1) Have an LTZ or High Country
Step 2) .... I haven't figured this part out yet.

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Oh my bad I have a Sierra. 

[GMC207]

8 hours ago, fsuboy75 said:

 

Ahhh only on Chevys? 

[econometrics]

4 hours ago, GMC207 said:

Ahhh only on Chevys? 

Correct. The Multi-pro tailgates are too heavy for the power-up option. So, you won't have a power-up option on the LTZ/HC's if you get the new "Multi-Flex" tailgate on the 2021+ Silverados, either. 

[GMC207]

5 minutes ago, econometrics said:

Correct. The Multi-pro tailgates are too heavy for the power-up option. So, you won't have a power-up option on the LTZ/HC's if you get the new "Multi-Flex" tailgate on the 2021+ Silverados, either. 

Damn. Now I have to lift my own tailgate. Ha

[Steve-2019]

53 minutes ago, GMC207 said:

Damn. Now I have to lift my own tailgate. Ha

Or you could move on up and trade-in your Sierra for a Silverado!  

[GMC207]

23 minutes ago, Steve-2019 said:

Or you could move on up and trade-in your Sierra for a Silverado!  

Hey hey easy now! Haha! 

[Pyrojodge]

16 hours ago, fsuboy75 said:

 

You know when I first saw this when I was getting the once over with my truck I thought how often are you really going to use it... after a few years with this truck I use it all the time.  When you have your hands full and you can use your knee to put close up the truck it's awesome.  It's fun messing with people too that see the tail gate open and have some one throw something in the back then have them walk away and the gate goes back up...  I actually LOVE this feature...

Edited October 28, 2020 by Pyrojodge

[Chad Nelson]

On 10/27/2020 at 3:25 PM, GMC207 said:

wait, it closes itself too?! How do you know you if you have this option? 

 

I'm going to go out on a limb here, but I would say testing that method would tell you if you have that option...smh