Model-X

My Model X Went In for FSD Repair. The Loaner Was a HW4 Model Y.

FSD v12.6.4 on HW3 vs FSD v14.2.2.5 on HW4, tested on real Vancouver roads.

I didn’t plan this comparison. The service appointment did.

My 2017 Model X 100D (HW3, with a paid MCU2 + HW3 retrofit done years ago) went into Tesla’s Vancouver service center for an intermittent Autopilot dropout — diagnosis: overheating in the self-driving control unit. Tesla replaced the Autopilot ECU (2nd and 3rd gen modules) under warranty. The loaner they handed me was a 2026 Model Y on HW4, and I had it for one day.

I'm opening up my Tesla health monitoring garage

This is a launch post. If you’ve followed the Tesla Longevity Lab channel or seen me reply to threads on Tesla Motors Club and Reddit, you know what I’ve been working on. Today I’m taking the wraps off.

Today, two things go live:

1. t800.io — the website for T800, a long-term health monitoring system for Tesla Model S/X.
2. t800.io/garage — a public daily health report for my own 2017 Model X 100D, updated every morning. Real CAN telemetry, not a mockup.

That’s the launch. Below is the why.