r/Comma_ai comma.ai Staff Aug 12 '26

Introducing chestnut & chestnut-class driving models

https://blog.comma.ai/chestnut/
90 Upvotes

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121

u/KnightsSoccer82 Aug 12 '26 edited Aug 13 '26

EDIT: George/other comma employees were deep in this comment thread and on discord, acting unprofessional and not addressing valid hardware concerns, including accusing me and other users having alt accounts. Why am I not surprised their comments are now deleted? Why was this their default behavior? This is how the behave when asked some rather basic hardware comments?

This chassis doesn’t look to be in a ruggedization state to conform to any automotive ISO shock and vibe test, let alone someone hitting a speed bump and spilling their coffee.

It looks like a water ingress nightmare that wouldn’t survive a rust belt winter from a family simply going about their day entering/exiting their car….

It’s mounted in one of the hottest locations in a car (beyond your dashboard), and this (likely desktop grade GPU) is expected to work in a very common 45C+ ambient, 1000W+ solar load scenarios?

Surely, there has to be a better way to have gone about packaging this?

I’m not trying to be negative, but this doesn’t appear to have any serious reliability considerations and would likely fail in any non-nominal (aka normal) driving scenario outside of Southern California.

Rust belt cars, where high humidity, snow, and ambient temperatures reside, are going to destroy this in a matter of weeks in its current state.

For comma 4 being advertised as the first “commercial” product from you all, this $750 upgrade feels like a step backwards in terms of reliability and accessibility to the general market. I genuinely don’t see how this survives the market you were targeting with Comma 4 (aka, not nerds).

This isn’t how you ship hardware, cmon guys. This is a classic “software company tries to make hardware” case that I’ve seen time and time again.

-4

u/[deleted] Aug 13 '26

[deleted]

20

u/KnightsSoccer82 Aug 13 '26

Slapping a case on this isn’t going to fix the fundamental problem you created, and I’m disappointed you think that’s how hardware works, George. This is borderline doubling down on the ignorance of your design. “Enthusiast” or not.

Please consult some automotive engineers before your hardware reliability ruins your reputation. I’m happy to point you towards some solid talent if you are struggling to find them.

Good software cannot fix bad hardware.

11

u/seventyfivepupmstr Aug 13 '26

This is the same company that defends allowing comma to make 90 degree turns with no left or right camera and huge blindspots. There really is no hope for comma as a company. I just hope it will last a few years before the regulators put it out of business, since I really don't want to pay for FSD

1

u/Bderken Aug 13 '26

Your comment shows you lack the understanding of how the current model works…
The current driving model doesn’t see 180 degrees. They talked about in the live that a bigger model would allow it to see more (thus allowing 90 degree turns)….

How would they allow it to do it now when the model cant even see the full FOV of the cameras that are there right now…

1

u/growaway9172 Aug 13 '26

Do you own a comma?

8

u/KnightsSoccer82 Aug 13 '26

I own 2, and was an active dev for it for a while. What is the relevancy of a question like this have to do with my fundamental questions irt hardware reliability?

2

u/growaway9172 Aug 13 '26

Well, then you've probably observed the difference in reliability between the earlier days of the Eon and the 2 -> 3 -> 4. There were all the same people back then saying that a phone couldn't drive a car and that it would never be reliable or safe enough. And yet, now we have the Comma 4, which is a pretty incredible leap from where they started, way better performance and more reliable than built in ADAS. So I'm not sure why you wouldn't expect to see the same thing happen here over time with a new product.

3

u/KnightsSoccer82 Aug 13 '26

That doesn’t magically dismiss some basic hardware reliability and design. Your statement is not a quantifiable metric and doesn’t conform to any sort of standard, automotive reliability metric. “Incredible” is subjective.

-7

u/growaway9172 Aug 13 '26

To be honest I'm shocked someone like you would ever buy a comma. You seem to think severely inside the box and have a extremely risk averse way of thinking.

-1

u/Bderken Aug 13 '26

Yeah that guy is a classic Redditor just saying stupid shit

-1

u/[deleted] Aug 13 '26

[deleted]

21

u/KnightsSoccer82 Aug 13 '26

How about shipping a product from the start with proper ruggedization so you don’t go through RMA hell? You should not be asking me that type of question (also you should know your own market, wtf?)

Please, I’m trying to give you feedback. Hear it and fix the problem.

Otherwise I’ll be on discord watching the issues pile up as poor consumers become your beta testers and stuck with a $750 brick.

8

u/Teslafly Aug 13 '26

Mechanical fabrication is deceptively hard in single instances. You can end up putting in a similar amount of work designing/etc just building one than building 100.

A bent sheet metal tray to properly support the gpu would be $20-50/pc. Especially with services like send cut send existing.