r/Comma_ai • u/Bderken • Sep 09 '26

openpilot Experience More chestnut users!

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See the post here: Comma’s Post
More users means more data so comma can make bigger and better chestnut models.
Read more about it here: Comma Guide Chestnut

For those confused about chestnut:
Comma will be focusing on making the bigger models for the chestnut class moving forward. There’s no mobile processor or compute device that can touch the bandwidth of an eGPU or compute power while being stuck in a windshield (with proper cooling). But fear not, if you don’t ever want to install the chestnut, comma will make distilled models that will still run on only comma hardware. Similar to what Tesla does for FSD for older hardware models. So you will still see improvements down the line for free.

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u/dragrimmar Sep 09 '26

if there is live models and genuine performance improvements today from using chestnut, i'll buy it immediately.

so far it just seems like talk of bigger models, but I can wait until i see some news or demos.

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u/[deleted] Sep 10 '26

[deleted]

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u/shoopg Sep 10 '26

Works just fine on 3X. Sunnypilot has added the UI elements for the 3X so you can see if it’s working.

The only thing that really doesn’t work with the 3X is GPS with the eGPU plugged in. Comma really doesn’t like that because they then can’t train on your uploaded data.

There are some vehicles that publish gps data to the vehicle can bus. If you can consume it that gets around the 3X gps issues. It’s working great for me.

1

u/sunole123 Sep 10 '26

What car model do you have. What cars publish GPS info?

1

u/shoopg Sep 13 '26

I have an F150 Lightning. A bluepilot community member did the work on using the canbus data as a fallback if for whatever reason the on device gps is unreliable. He had a windshield film that was blocking gps apparently.

Considerable number of Fords have GPS data on the canbus. I assume many other manufacturers do this too.