V8 mode

[Charm2999]

Does anybody know how to tell if your in v8 mode or v4 mode on 2021 Sierra? It’s not on the screen where it shows your mileage anymore

 

[RWTJR]

Which engine do you have?

[ericarenee]

there are no v8 v4 v6 modes . there are  is a computer algorithm that can shut off any of the cylinders and does so randomly .  no way yo know if you are in v8 mode unless you put in l 7 or l9 depending on rather you have a  8 or 10 speed transmission.. 

[RWTJR]

15 minutes ago, ericarenee said:

there are no v8 v4 v6 modes . there are  is a computer algorithm that can shut off any of the cylinders and does so randomly .  no way yo know if you are in v8 mode unless you put in l 7 or l9 depending on rather you have a  8 or 10 speed transmission.. 

Not true. If the OP has AFM (L82 5.3L) instead of DFM (L84, 5.3L or L87, 6.2). AFM is V4 or V8, DFM has the algorithm. Both AFM and DFM are used in 2019 and up 5.3L trucks dependent on trim level.

 

JMHO

No expertise implied or expressed

[wizard4878]

34 minutes ago, RWTJR said:

Not true. If the OP has AFM (L82 5.3L) instead of DFM (L84, 5.3L or L87, 6.2). AFM is V4 or V8, DFM has the algorithm. Both AFM and DFM are used in 2019 and up 5.3L trucks dependent on trim level.

 

JMHO

No expertise implied or expressed

Actually the AFM was only available in the 2019 classic, which was the same body as the 2018.  All new body 2019 and up it was the DFM,  or at least that's what it says on GMs website

[OnTheReel]

AFM is still used in WT, Custom and base Sierra trims.

 

There is no indicator of what mode it’s running in anymore. No matter if it’s an AFM or DFM motor.

[RWTJR]

Hmm. I read the L83, 5.3 (AFM) was only available in the 2019 classic and the L82 5.3 (AFM) was being used in the lower trim levels of the new gen Silverado and the L84, (DFM) in the higher trim levels.

 

I just popped over to the 2021 Silverado configuration page and configured a WT Trim truck with the 5.3L AFM and 6 speed transmission. Page can be found here: https://www.chevrolet.com/trucks/silverado/1500

Or you can just click on the 5.3L icon and it will show both the L82 and L84 availability.

 

The page says the 5.3l (L82) with AFM engine is available on the WT, Custom and Custom Trail Boss trim levels.

 

JMHO

No expertise implied or expressed

 

 

Edited January 10, 2021 by RWTJR

[redwngr]

Custom TrailBoss also has the AFM as an option, and not the DFM

 

The trims that have the AFM (L82) as an option, cannot get the L84 (DFM) engine.  

 

Custom TrailBoss can get the 6.2L.

The other 3 (Base Sierra, WT, and Custom) cannot get the 6.2L

 

 

[Charm2999]

I have the Sierra slt 5.3l 10 speed

[RWTJR]

24 minutes ago, OnTheReel said:

There is no indicator of what mode it’s running in anymore. No matter if it’s an AFM or DFM motor.

Makes perfect sense.

 

I knew the DFM didn't have any notification/indicator because of the multiple quickly changing cylinder configurations but I was unaware they removed the notification on the AFM engine equipped trucks. Thanks

 

No expertise implied or expressed

[RWTJR]

21 minutes ago, Charm2999 said:

I have the Sierra slt 5.3l 10 speed

You should have the L84, 5.3L with Dynamic Fuel Management (DFM). DFM engines have never had any notification/indication of cylinder activation/deactivation. DFM is continually changing between 17 different cylinder patterns (activation/deactivation).

 

https://gmauthority.com/blog/gm/general-motors-technology/general-motors-propulsion-technology/general-motors-dynamic-fuel-management-cylinder-deactivation-technology/

 

Edited January 10, 2021 by RWTJR
misspelled fuel, Doh

[flyingfool]

sounds like a God damn nightmare!  I swear GM is hiring ex-NASA scientist just to give them something to do..

[Charm2999]

Thanks everybody. I guess I’ll be waiting for a range tuner to develop one for the 10 speeds to turn this crap off

[901at4]

^^ me too 

[flyingfool]

what year vehicle?

 

for 10 and 8speeds trans, doesnt the DOD shut off when shifted into either 9th or 7th gear