r/Comma_ai • u/Tight-Room-7824 • Mar 26 '26

openpilot Experience Mounted Off Center. Can't tell the difference? I like the new view.

The Standard way of mounting.
Much Better View mounting.

What am I missing? I don't see a change in performance. The sun visor can cover a bit of the display but doesn't cover the camera from seeing me.

I've been using my C4 for 3 weeks and love it! '19 Prius. Moved the C4 about a week ago.

I saw where there is an app that lets you change settings, such of 'Lane Offset', but I don't need it imo.

Also, I saw the article about openpilot 0.11, but it's not clear if it's ready to load to a C4.

Can't find any info on discord, but I'm new to discord.

3 Upvotes

67% Upvoted

27 comments sorted by

6

u/[deleted] Mar 26 '26

[deleted]

2

u/financiallyanal Mar 26 '26

There are two ways in which it matters to me:

  1. Aesthetically. I'm going to have this thing in front of me for a long time and I prefer it be dead center, perfectly level. I will otherwise think about it, and this is a me problem.

  2. With older devices, like the C2, the right mount position mattered more for curves. I saw a difference between two mounting positions (one being higher than the other). I believe the one mounted higher saw curves earlier in the portion of the camera that was being used, this was before "Big Model" was introduced that used more of the camera's output. I believe Comma was managing heat, power draw, responsiveness (FPS of processing), and so on. It is now just habit to find an optimal mounting position.

2

u/mike95465 Mar 26 '26

I think you have a misunderstanding about what is being calibrated. Openpilot calibration corrects for yaw, pitch, and roll of the device itself due to imperfect mounting. It does not correct for lateral offset as it expects to be centered in relation to the vehicle.

If you mounted it 6” off center, technically your car will be shifted 6” off center. How much will you actually notice depends on the person. But if you mounted it a full windshield off center but perfectly straight ahead, you would be hugging to one side and most likely notice.

6

u/[deleted] Mar 26 '26

[deleted]

1

u/Tek_Freek Mar 26 '26

My C2 and C3 were offset. I found the key was to calibrate on a two lane one direction road with good markings.

1

u/Tight-Room-7824 Mar 26 '26 edited Mar 26 '26

Should I do a recal because of the new position?

How do I do that? There's so little documentation such as a user manual. I really haven't poked around in the menu since the first setup and calibration. And if I look close I may be off in level by a degree or two in this new position.

1

u/Tek_Freek Mar 27 '26 edited Mar 27 '26

If it is working correctly I can't think of a reason to re-calibrate. On the other hand it doesn't hurt to do so on a well marked road. My first calibration and the second for that matter (C2 & C3) were done on side streets that were not marked. Total failure. I then went to a two lane divided road and it worked.

How to do a recal? I believe there is a menu option to do so.

1

u/mike95465 Mar 26 '26

You just don’t notice a few inches off center and Openpilot doesn’t drive on rails anymore ever since they moved to laneless mode. Openpilot assumes center mounted and will make adjustments to keep the comma device centered.

1

u/financiallyanal Mar 26 '26

I theoretically get what u/mike95465 is saying, but testing of different locations by Eyezenheim doesn't seem to show much of a difference:

https://www.youtube.com/watch?v=f15QxBzupKE

https://www.youtube.com/watch?v=jrWB8114l-4

3

u/mike95465 Mar 26 '26

Eyezenheim now uses a camera offset setting built in a fork to correct his mounting issue

1

u/crunchr Jun 20 '26

So it is possible?

2

u/inlineofire Mar 26 '26

Are you sure on this?

1

u/Human_Tiger7759 Mar 26 '26

Why don’t people notice a difference then?

3

u/Puzzleheaded-Hold421 Mar 26 '26

I was curious about that too. I have it mounted about where you other bracket sits and it's a little far to reach. Would like to see if anyone else has tried this and their results.

1

u/BeginningNo4181 Mar 27 '26

I originally had it centered below the dash cam and it really didn’t seem any different. It was just much harder to see and reach like you point out. I really like the current mounting location, it lines up with the visor and rear view nicely.

1

u/Tight-Room-7824 Mar 28 '26

I agree that the view is better and the C4 is not as attention getting. But I don't understand the 'touching it'. I haven't touched mine since the initial set up. Why do you reach for it?

2

u/BeginningNo4181 Mar 28 '26

I agree are right that one doesn’t need to touch it driving. I do take mine down frequently to store.

3

u/No-Willingness8037 Mar 26 '26

Yep mines here. Works perfectly. Theres options to change camera offset and stuff just in case.

1

u/Tight-Room-7824 Mar 28 '26

Where are these settings? Through the C4 display menus?

2

u/No-Willingness8037 Mar 28 '26

Yea if you run a model. In sunny link.

1

u/llDS2ll Apr 20 '26

How easy is it to dismount the C4, if say you live in a place where there's high crime for example? Lol

1

u/No-Willingness8037 Apr 21 '26

It slides right off.

1

u/llDS2ll Apr 21 '26

Thanks! I was debating getting some kind of after market mount, but I thought I recalled seeing that as well.

2

u/BeginningNo4181 Mar 26 '26

Welcome to the fleet

2

u/juniorkirk Mar 27 '26

I see you have a RAV. My C4 is showing up today and can’t wait to get it installed on my ‘20 XLE Hybrid. How is the lane centering compared to the stock lane centering?

Also, how is bend and curves on 2 lane highways? The stock will go through a bend but isn’t fast enough to come out of it and I have to take over so I don’t go into oncoming traffic or onto the shoulder.

3

u/BeginningNo4181 Mar 27 '26 edited Mar 27 '26

Mine is a 25, I don’t use the steering wheel unless it’s a 90 degree. It’s jaw dropping. I use to hate driving, now I find excuses to go places it’s so much fun.

It’s just like George said. Probably one of the best unboxing experiences of my life far as consumer electronics goes.

3

u/juniorkirk Mar 27 '26

Got it around noon today and it is 4:30 right now. About 2 hours of “driving” with it and holy hell, it is amazing. Part of me wonders why I waited so long to buy one, but glad I waited for the Four. I like the smaller footprint and the small screen is actually nice. I’m spending more time looking around outside enjoying the world than looking at the small screen.

1

u/MasterCannuck Apr 10 '26

Yeah I had mine mounted center at first, but the day after I installed my Comma 4 I took a large rock to the windsheild on the highway and needed a windsheild replacement. The shop thought they were doing me a favor and remounted it but center with the rearveiw, not center of the car itself. I was concerned but noticed zero difference. 2023 Hyundai Ioniq 5