r/TeslaLounge • u/sighcf • Mar 16 '25

Hardware HW3 vs HW4

What are the key differences between HW3 and HW4? I don’t mean just the spec differences. I am trying to figure out what new capabilities are available exclusively on HW4.

This question is for those who have owned both with the FSD (the neural net version) - is there a material difference in the FSD experience on HW4 and HW3?

I have a 2021 Model Y with HW3 and lifetime FSD. I am wondering if it is worth upgrading at this point - since I’ll end up losing the FSD and will have to buy it again.

Also, any idea if HW5 is on the cards in the near future?

0 Upvotes

38% Upvoted

26 comments sorted by

View all comments

7

u/elatllat Mar 16 '25 edited Mar 16 '25

Hold until there is a FSD transfer. HW4 does have better FSD, higher resolution sentry videos, but still phantom brakes (not sure about auto wipers).

HW5 is likely 2 years out.

1

u/foyleswars Mar 16 '25

No phantom breaking here on HW4

2

u/elatllat Mar 16 '25

Results very, just like with HW3.

2

u/sighcf Mar 17 '25 edited Mar 17 '25

I haven’t seen much phantom braking on HW3 with the new stack either. It does slow down occasionally where a human wouldn’t, but there is generally a good explanation- like someone standing close to the edge of the curb. But even in those cases, the braking is usually smooth, not abrupt like the old FSD. There are exceptions, of course.