KairosEngineering
Real ZD8 CAN · Queensland Raceway

The data your GPS logger can't see.

One sentence: KAN_1 is a CAN logger for the gen-2 GR86 / BRZ that reads the factory bus and puts real driver inputs on your footage.

Why01

Your car measures it. Nothing you own reads it.

The reason the project happened. A GPS logger infers from position; it cannot measure what your hands and feet did. Video shows the corner but not the inputs. Meanwhile the ECU has gear, throttle, brake and steering on the bus every few milliseconds, and none of it reaches the tools people actually use at a track day.

vs · GPS logger

It infers, can't measure

Position and speed only. Gear, throttle, brake and steering are not derivable from a track trace.

vs · Camera alone

A picture, no numbers

Good footage, zero data. Nothing to scrub a graph against when you want to know why a lap was slower.

vs · Piggyback sensors

Guessed, not measured

Add-on sensors approximate what the factory bus already states exactly.

Proof02

This is a real session. Go and open it.

The clip above is not a render and these are not sample values. Twelve channels decoded off a ZD8 at Queensland Raceway, aligned to GPS on UTC. The browser tools below run on that exact session — free, no signup, and nothing you load ever leaves your machine.

Group 01 · what you did

Driver inputs

  • Accelerator_Pos %
  • Brake_Pos %
Group 02 · what the engine did

Drivetrain

  • Engine_RPM rpm
  • Gear selected
  • Speed km/h
Group 03 · what the car did

Chassis

  • Steering_Angle deg
  • Yaw_Rate deg/s
  • Lat_Accel g
  • Long_Accel g

Logged, but not drawn by the v4 overlay yet.

Group 04 · what it cost

Fluids & temps

COOLANT 89°C
89–91
OIL 121°C
120–123
FUEL 49.0%
40.0–97.0
  • Coolant_Temp °C
  • Oil_Temp °C
  • Fuel_Level %
The rest of the bus. Name what you have seen but not yet audited — tyre pressures, intake air temp — and be explicit that it is not on the list above because it has not been checked against a reference yet.
SessionLOG0009
CircuitQueensland Raceway
Samples5,496@ 10 Hz
CAN ↔ GPS0.9994r
Open the overlay Open the data review
Try it03

Drag across the lap. That is real data.

Say what someone should actually do here — drag to scrub, switch channels on and off, watch the car move round the map — and that this is the same interaction as the full tool, one size down, running on the same lap as the clip at the top.

– LOG0009 · lap 4 · 10 Hz · real
Use it04

Three ways out. None of them lock you in.

The point that the file is yours and the tools are optional — two of these are free browser tools that never upload anything, and the third is just the CSV, which opens in whatever you already use.

Way 01 · the one you'll use

Burn it onto the footage

Gauges, traces and driver inputs rendered over your GoPro clip, aligned on GPS UTC rather than by lining up a clap. Free, in the browser.

Open the overlay
Way 02 · the one that finds time

Review the lap

Scrub the traces against the track map, lap by lap — the full-size version of the block above. Free, in the browser, nothing uploaded.

Open the data review
Way 03 · the one that outlives me

Just take the CSV

Plain, unencrypted, engineering units, with both time_s and utc columns. No account, no cloud, no export queue. Ignore the tools entirely if you want to.

What's in the file
Trust05

It physically cannot transmit to your car.

The trust argument. The transmit line is cut in copper, not disabled in firmware — an open solder jumper in series with CAN TX, held recessive by a pull-up on the transceiver side. The free DIY builds ship with a real warning about corrupting the bus. The usual answer is to promise the firmware won't. That's a promise. This is a gap in a trace, and you can close it yourself with an iron if you ever want to.

Render · rev C · not a photograph

What the legend on the board says, and why it was written to be legible in a photograph. The transceiver's standby pin is tied to ground, so there is no software route to silence it either way — the jumper is the only hard guarantee on the board.

What it does & doesn't do
Sign up06

Five are being built. Say if you want one.

Restate that it's a list and not a pre-order, that no money changes hands, and that whether a bigger batch happens at all is decided by how many people put their hand up here.