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Old Jul 7, 2019 | 11:49 AM
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Default Afm

Same engine ,same active fuel management. Sounds like the same old problem for the C8
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Old Jul 7, 2019 | 12:10 PM
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I don’t think the LT2 is an LT1. That’s why it’s called LT2.
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Old Jul 7, 2019 | 03:37 PM
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I don't recall there being a huge problem with it in the first place?
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Old Jul 7, 2019 | 04:34 PM
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Maybe GM will use their new AFM from the V8 Silverado that will even drop 7 cylinders and run on one, since it's now a LT2 instead of a LT1.
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Old Jul 7, 2019 | 05:23 PM
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Originally Posted by JoesC5
Maybe GM will use their new AFM from the V8 Silverado that will even drop 7 cylinders and run on one, since it's now a LT2 instead of a LT1.
This will probably be the case at some point. Hard to say if it will have it right out of the gate or not. It will have some form of AFM.
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Old Jul 7, 2019 | 05:25 PM
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The car will have the latest AFM. We've seen the dash showing a "V8" logo by the tach. It wouldn't say this if there weren't other modes.

Good thing is there will be no torque tube harmonics to deal with and no torque converter.
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Old Jul 7, 2019 | 05:37 PM
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Originally Posted by Tool Hoarder
The car will have the latest AFM. We've seen the dash showing a "V8" logo by the tach. It wouldn't say this if there weren't other modes.

Good thing is there will be no torque tube harmonics to deal with and no torque converter.
My Tahoe says V8 and then it says V4 when it drops using old AFM... That V8 in the photo doesn't mean it will have the newest one. (think 8 speed in 15 up, the trans was already out in 14...) But it probably will.
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Old Jul 7, 2019 | 06:24 PM
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for everyone referring to old and new AFM, the new one is actually called Dynamic Fuel Management (deactivating all the way down to 1 cyl, vs the AFM can only go down to a V4, plus AFM deactivates the exact same cylinder banks, vs DFM changes it on a random), I imagine not being a problem deactivation so many cylinders on a performance car if it's fully doing it only in Eco or something like that.
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Old Jul 7, 2019 | 06:25 PM
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Originally Posted by kev1949
Same engine ,same active fuel management. Sounds like the same old problem for the C8
And what was the problem? Torque converter on an auto, right? And where is the torque converter for the C8? Oh wait....
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Old Jul 7, 2019 | 07:26 PM
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Well, I sure don't want to get into that old discussion, so here's my comment and question:

For a system like AFM/DFM to show an EPA increase, it must be ON (default) when the car is started.
So...I wonder if the C8 is going to start up in "Automatic" with AFM/DFM enabled?
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Old Jul 7, 2019 | 09:30 PM
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Originally Posted by jimmyb
Well, I sure don't want to get into that old discussion, so here's my comment and question:

For a system like AFM/DFM to show an EPA increase, it must be ON (default) when the car is started.
So...I wonder if the C8 is going to start up in "Automatic" with AFM/DFM enabled?
Yes it likely will and GM may prevent you from disabling it. Tuners, like Range, will try to figure out how to disable it. Thank the government.

Last edited by rmorin1249; Jul 7, 2019 at 09:31 PM.
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Old Jul 7, 2019 | 11:07 PM
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Originally Posted by jimmyb
Well, I sure don't want to get into that old discussion, so here's my comment and question:

For a system like AFM/DFM to show an EPA increase, it must be ON (default) when the car is started.
So...I wonder if the C8 is going to start up in "Automatic" with AFM/DFM enabled?
Even back in the day GM didn't easily let you turn it off... you had to get creative. I'd imagine in track mode or something it'll be off though. It is like that currently I believe.
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Old Jul 8, 2019 | 12:47 AM
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Originally Posted by kev1949
Same engine ,same active fuel management. Sounds like the same old problem for the C8
Agreed.

I'll be LMAO, if/when the automatic transmission only C8 starts it's V4 shuddering.



.
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Old Jul 8, 2019 | 12:51 AM
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Originally Posted by 84 4+3
My Tahoe says V8 and then it says V4 when it drops using old AFM... That V8 in the photo doesn't mean it will have the newest one. (think 8 speed in 15 up, the trans was already out in 14...) But it probably will.
The GMC Yukon XL's AFM is a miserable nuisance. C8.....here it comes.
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Old Jul 8, 2019 | 08:32 AM
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Originally Posted by Skid Row Joe
The GMC Yukon XL's AFM is a miserable nuisance. C8.....here it comes.
The new ones just as bad? Great lol.
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Old Jul 8, 2019 | 10:46 AM
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Originally Posted by 84 4+3
Even back in the day GM didn't easily let you turn it off... you had to get creative. I'd imagine in track mode or something it'll be off though. It is like that currently I believe.
No, on a MANUAL C7, AFM is engaged only if you put the Drive Mode to "ECO" (car defaults to whatever mode you were in the last time the engine was shut down). On an automatic C7, AFM is on all the time, unless you put it in "M" and use the paddles.
I wonder if the C8 will operate like that....using the paddles disables AFM?

Last edited by jimmyb; Jul 8, 2019 at 10:47 AM.
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Old Jul 8, 2019 | 12:32 PM
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Originally Posted by FringbirdAloha
I don’t think the LT2 is an LT1. That’s why it’s called LT2.
They change the location where the transmission gets bolted up.
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