Rev-Hang
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Bug or feature?
I'll record it this weekend. I've heard Honda's doing this. It's for emissions and since I have a new 2020 N, I'm wondering if others are experiencing this.
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The way mine operates and the way I've seen other N's operate with Rev Matching is that it goes like this; Push in the clutch, revs jump (for faster down-shifts I think, don't quote me), go to my desired gear, revs match to that gear and hangs out where there which allows for me to let go of the clutch for a smooth transition to the desired gear. I will try and see if I can't make a video myself showing you what mine does in an effort to help you out. Otherwise, I havent noticed a single bit of rev hang in my car. I almost purchased a Honda Civic hatchback, but this Veloster N stole me away with its performance, no rev hang and other features. Generally speaking, as long as you are in gear with rev-matching on, it should always just match the revolutions to the speed of the car for a smooth shift. If you are not in any gear and it's hanging then that sounds like something else that I am unfamiliar with. My RPMs drop the moment I am out of gear.
That's super weird
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It will only hold revs for a couple seconds in each gear, if you don't let the clutch out in that time it will drop to idle.
Looks like you accelerate in 1st, push in the clutch (revs drop slightly, expecting a 1-2 shift), but you don't take the shifter out of 1st so revmatch bumps rpm back up to match 1st gear again. After a second or two it figures you're not planning on letting the clutch out at all and goes back to idle.
Looks like you accelerate in 1st, push in the clutch (revs drop slightly, expecting a 1-2 shift), but you don't take the shifter out of 1st so revmatch bumps rpm back up to match 1st gear again. After a second or two it figures you're not planning on letting the clutch out at all and goes back to idle.
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76 Posts
Does yours not do that?
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76 Posts
Exactly
Mine doesn't hold the revs up after it drops. I also don't keep the clutch pressed for too long. I will need to deliberately try that
This is what I'm getting with rev matching on. There is a 200~300 rpm blip from first to second. This happens randomly and in no other gear. It's similar to a lazy foot on the gas between shifts.
This is rev matching off. Expected behavior between shifts.
This is rev matching off. Expected behavior between shifts.
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That definitely seems weird.. I see that little blip you are talking about. Being that it is inconsistent (considering you've mentioned it doesnt happen all the time), I would go as far to say thats out of the norm and might be worth bringing your car to the dealership. It's good that you have the video on hand too, you can show this to the dealer so they can get a better understanding on what it is that you are talking about.
If it makes you feel any better, i'm taking my car in to the dealership too, but its for a small piece of paint on the front bumper that didnt bond properly. I'm getting my entire bumper repainted for free lol. I honestly expect to take my car to the dealer a few times. My tune button doesnt even do anything when pressed either. I should probably bring that up to them now that I think of it.
Out of curiosity, are you driving the performance package or the base model?
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36 Posts
That is interesting. It seems like your computer is trying to compensate, sort of like rev-match. Does it do it if you shift from 1st to 2nd quickly? I'm not speaking of speed shifting, just normal.
If I'm going WOT, that blip will be more pronounced. Like 500 rpm or more. I've drove my friends BMW M3 and it doesn't do this. I'm going to take it to the dealer when I get the chance.
I have the performance package. It's been like this since I picked it up a couple of weeks ago. I will definitely be going to the dealer for this. While I'm there, I'll complain about the soft windshield glass since mine is pitted already. Yay! I can see stars in the middle of the day!
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5,175 Posts
I believe what your experiencing is due to the anti-lag system. Driving a slower speeds and shifting at lower revs, you'll notice it more readily, as in your video. Driving the VN with more liberal throttle and urgency, you won't. This would explain what you are calling rev hang and demonstrating in your video. It's normal for the system and will increase revs slightly to keep the turbo spinning at a higher rpm, for the purpose of boost recovery. Thus a sustainment of revs for a short time during upshifting and downshifting. Its a control of the ECU and tuning to produce shorter boost fluctuations, during off and on throttle periods.
https://en.wikipedia.org/wiki/Antilag_system
https://en.wikipedia.org/wiki/Antilag_system
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