Is there any way to disable the active fuel management on the C8? I have a Range Technology AFM disabler on my C7 and love it. I checked their website a while ago and did not see one for the C8.

 

I wouldn’t even bother it’s quite seamless.

 

If a company develops one, I will certainly look into it. It is NOT seamless in my 23 HTC!

 

So much discussion lately about this....

There is nothing currently available to disable AFM other than either go into Manual Mode or set up Z Mode such that you have "shift / engine" set to "track"..

That said...Compared to my C7 I don't notice or even feel the switch over from V4 to V8 in my Z51 C8...It's smooth and seamless for me...

 

Curious about you Range device guys that have posted. I bought one for my '14 Silverado and it worked fine as far as disabling the AFM, but if I didn't pull it when I got out, it would kill the battery after about 3-4 days of the truck not being used. I swapped it out for a Diablo tune.

 

I’ve never heard it, felt it, or noticed the AFM….except for the green V4.

21 Coupe, Z51, FEL, Mag.

 

For those that want to disable AFM, what is the reason?

 

1) I can feel it
2) I can hear it. (non NPP exhaust)
3) I question what, if any benefit it has. The car get's good mileage on the highway because it has an 8 speed trans.

Just my opinion ...

My Silverado lost maybe a .5 mile to a mile per gallon tops, going from AFM to having it disabled.

 

Mine has an audible squeak, other than that not-noticeable. I just turned up the Z mode settings to keep it out of AFM.

 

Anyone who claims they can feel it has something wrong with it. It's absolutely seamless for me. I drive a two lane country road in cruise control mostly to keep from speeding and I've never felt it switch back and forth and don't know which mode it's in without watching for the V4 mode light. Amazing system.

 

Posts on the forum seem to indicate the C8 has a pretty seamless switch between V8/V4. If yours is otherwise, perhaps a trip to the dealer for diagnosis is in order.

 

I've only driven in manual mode so it's never come on

 

Really? Seamless to you may not be seamless to the next person. I'm glad you're happy with it. I believe mine's operating as designed with no issues as far as that's concerned. But I still don't like the design. And as stated previously, I do think it does it fairly well and enjoy driving the car big time. But I can't believe anybody with an opened up exhaust isn't grossed out when they hear it in V4 mode. Mine sounds like crap with a stock non-NPP exhaust. And as stated previously, I don't think it brings any value. Just more expense on the tech for it.

 

Same experience here!

 

I believe mine's working as designed, and most people don't seem to have an issue with it. Obviously I do. Just my opinion ...

 

With all the complaints about how quiet the exhaust is inside the car, I find it interesting that some can hear the difference in the exhaust when it switches to V4. Once again, I don't hear that either, probably because of the radio, wind noise from having the windows rolled down, or how loud the tires are on certain pavement or I just don't listen for stuff that's not there.

 

I can hear it both when it transitions and while it is in V4 mode. Thats in my HTC with the top down. Its less noticeable with the top up, and either way its very subtle - I'm not surprised that many do not hear it at all.

There are several features in the car designed to minimize the the effect. One is some clutch micro-slippage during the transition that is described in the ""Mid-Engine Revolution" book. Another is some sort of pendulum damper on the crankshaft that is described in one of the automotive reviews. And the third one that I am aware of is the Engine Harmonic Cancellation that is described on the Bose site for the C8 here
https://automotive.bose.com/vehicles...vette-stingray
if you have the 14 speaker system - its not listed on that web site for the 10 speaker system. That feature is also described in the Owner's Manual as "Active Noise Cancellation". It works all the time regardless of any of the audio settings. But I believe it is only going to be effective if the top is closed. And as I said, with the top closed on my HTC it is much less noticeable.

Edit: here are the sources for the other two noise quelling features:

"SAE Special Report: Engineering the C8 Corvette" dated Sept 2020 which says:

"Connecting the LT2 engine’s crankshaft to the TR 9080’s clutch basket is the responsibility of a flywheel carrying the starter ring gear and a centrifugal pendulum damper that’s needed toquell torsional vibrations erupting during the engine’s migration between V4 and V8 firing modes (a fuel efficiency improver).

"Corvette Stingray The Mid-Engine Revolution" published 2020, which says:

"The new dual-clutch transmission, however, has less inherent capability to mask engine vibration, which is why cylinder-deactivation technology has so rarely been used on a car with a dual-clutch transmission. The C8 engineers were able to marry these two technologies in the new Corvette, however, by putting some micro-slip into the clutch control of the DCT. As a result, those transitions are almost imperceptible, or as Kociba claims “butter-smooth.”

I find it interesting that during the transition from V8 to V4 there is actually some clutch modulation going on - it just shows how integrated and complex this system actually is.

 

My car is the coupe and so I just don't hear it. The exhaust is barely discernable unless under acceleration or WOT when it's beautiful.

 

I updated post 17 to include some additional information about the clutch micro slip and the pendulum damper.

 

It’d be nice to be able to disable AFM in every mode rather than just Track and Z-Mode Track. I notice mine switch over most of the time. It can be seamless at times but I wouldn’t say that is the norm in my experience.

Would agree that seamless to one person isn’t to another.