Auto Rev Match

[CT4-Villain]

My 26 CT4-V BW (with Rev Match turned on) wants to blip the throttle even when I'm not downshifting, usually after downshifting from 6th thru 3rd gear and then coasting the rest of the way. I find this odd if not a little annoying. Anyone else experiencing this ?

 

[1Evil55]

If you're anything like mine, you'll find it happens occasionally when you don't want it to. My most annoying moments are when I'm trying to parallel park usually in a congested area full of walkers. It will rev after I've nursed the clutch into a spot as I release clutch without a gear engaged. Annoying and seems pretty dangerous if God forbid I was in a gear and it just decides to rev on its own. I've video'ed it happening a couple times and shown my service writer. I've had a tech look into it although I don't think they looked at a thing as they said nothing is wrong. Sorry but you can't convince me everything is peachy. This was right after parking in the garage. Both feet far removed from the pedals:

ETA: I am struggle bussing to get this dang video to load

https://imgur.com/P5CjH09

 

[Super Saloon]

My 26 CT4-V BW (with Rev Match turned on) wants to blip the throttle even when I'm not downshifting, usually after downshifting from 6th thru 3rd gear and then coasting the rest of the way. I find this odd if not a little annoying. Anyone else experiencing this ?

My car will blip the throttle if I’m ‘downshifting’ into neutral as it’s anticipating me shifting into a lower gear. I don’t know the other variables which might be contributing (brake, speed, etc.) but I consider this normal behavior and it doesn’t bother me.

 

[NMBLKWNG]

This seems to be a thing with GM's implementation of rev matching, as far as anticipating a downshift when you are merely going to neutral (I find it happens more "reliably" when I give the stick the neutral wiggle). My C7 did the same thing and it was always an annoyance.

 

[albertw]

There are two, possibly three different issues.

When coasting in any gear (clutch engaged but fully off the gas), engine braking is intermittent. Every few seconds the computer adds enough gas to make the car feel like I've just disengaged the clutch. This is most noticeable in lower gears where engine braking is more evident. It's annoying but easy enough to work around.

When shifting into neutral while rolling and planning to leave it there, my computer blips the throttle if I move the shift lever sideways at all (eg. shift to neutral from 5th, move the lever a bit to the left as if I was starting to shift into 3rd). However, if I just move it straight back to neutral and do not move it at all sideways I do not get a blip.

I've never experienced the issue 1Evil55 described. It sounds like a genuine malfunction rather than just poor programming of the computer.

 

[hmrh]

My theory is that if there is any sort of shifter motion in neutral, even from the tiny momentum of actually shifting it into neutral, it will trigger a sensor and anticipate a downshift making a weird rev as you coast to a stop.

For a heavy transmission that needs to be manhandled this sensor is way too sensitive for daily driving (imo) so this random rev in neutral happens 80% of the time.

I do think it adds to the telepathic feeling of the rev match system during performance driving though so I guess tradeoffs needed to be made somewhere.

As for 1Evil's vid I have never seen that

 

[CT4-Villain]

If you're anything like mine, you'll find it happens occasionally when you don't want it to. My most annoying moments are when I'm trying to parallel park usually in a congested area full of walkers. It will rev after I've nursed the clutch into a spot as I release clutch without a gear engaged. Annoying and seems pretty dangerous if God forbid I was in a gear and it just decides to rev on its own. I've video'ed it happening a couple times and shown my service writer. I've had a tech look into it although I don't think they looked at a thing as they said nothing is wrong. Sorry but you can't convince me everything is peachy. This was right after parking in the garage. Both feet far removed from the pedals:

ETA: I am struggle bussing to get this dang video to load

https://imgur.com/P5CjH09

 

[CT4-Villain]

Yea mine doesn't do anything like that.

 

[CT4-Villain]

My car will blip the throttle if I’m ‘downshifting’ into neutral as it’s anticipating me shifting into a lower gear. I don’t know the other variables which might be contributing (brake, speed, etc.) but I consider this normal behavior and it doesn’t bother me.

Yea I'm not sure if it waits till I'm going into neutral or not, I'll have to pay attention to that next time but that's what it seems like to me too, the computer is anticipating the next downshift. The car I had before this (23 Toyota Supra) had auto rev matching and never exhibited any odd behavior like this. I guess that's asking too much of GM engineering to test these systems out before they go into production.