AutoX

When I started RaceCoach, my goal was simple: make better use of the telemetry I was already collecting during autocross.

Like many drivers, I was recording every run with RaceChrono Pro, a RaceBox GPS, and OBD data. I had plenty of information, but only a few minutes between runs to decide what to change. Looking at graphs and numbers wasn’t helping me answer the most important question:

What should I do differently on my next run?

That question has gradually changed the entire direction of the project.

The Original Idea

Progress at the PCA Zone 7 Autocross Weekend

I asked ChatGPT to summarize the results of the weekend as it related to the programming work we’re doing in RaceCoach.

The July 11–12, 2026 PCA autocross weekend at Salinas provided a useful test of both my driving and the RaceCoach analysis workflow I have been developing.

While at an event, RaceCoach outputs both a grid and latest report of the comparisons run (1 v 2, 2 v 3) done via run_analysis from the command line.

To read the background on this project, read through the repo’s files here:

https://github.com/peterm95018/Racecoach/tree/momentum-recovery

The grid report is here:

RaceCoach

This is an early draft of the project description. It has morphed during development so some of the points below have been altered.

RaceCoach started off as a personal autocross telemetry and coaching project built to help me get faster between runs. What is has changed into is a coaching engine that does this:

Observe → Diagnose → Coach → Improve

The goal is simple: after each run, RaceCoach should answer one question:

Last updated: September 2025

Introduction

Assetto Corsa has become my go-to tool for practicing autocross and track craft between real events. With Apple Silicon and CodeWeavers CrossOver Gaming, it now runs surprisingly well on macOS without needing a full Windows install or a virtual machine.

TL;DR: Best day ever for me. I hope to repeat this performance on another day. 

I let ChatGPT draft this based on my notes and data for the day.

Event: Golden Gate Lotus Club Autocross — November 1, 2025
Location: Laguna Seca Lakebed, near Monterey Bay, CA
Car: 2013 Porsche 991.1 Carrera S (Bridgestone RE-71RS, 32 psi hot)
Results: Official Results 

Date: August 2025

Rig: Logitech G920 • Assetto Corsa (PC) • Parallels/Windows 11 on Mac mini (M4)

TL;DR

I’m running Windows 11 under Parallels 20.x on a Mac mini M4 running MacOS 15.6.

I tried all the suggestions I could find via Google and AI clients to figure out how to get Logitech Ghub working in this scenario. No luck.

So I finally went back to something I had setup years ago; working with the Controls option in AC and that seemed to work in this limited scenario.

See the companion article on Racebox Setup.

Viewing Data

Tap the Track icon to look at data that has been collected.

Select a session to review. In this case it was the 3/16/25 Loma Prieta event. In the screenshot below, the green indicates the fastest lap.

See the companion article on Racebox Data Analysis.

RaceBox Mini Application Instructions for Autocross- Ed Fisher comes from a forum post I came across while trying to learn how to use the device. Mods by me based on v2.1.3 of the Racebox app for iOS and my particular process.

Setup the Course

I spent a lot of time in the Fall months rewatching some old videos on YouTube about slalom improvements. Given the much longer runs at Crows Landing, I was thinking that this was an area I might be able to see some time improvements. That may not have panned out, but I think I got better at understanding car positioning for back siding; understanding the entry/exit points relative to the next course obstacle and getting back to full speed in the last two cones in a slalom.