LIVE OPEN-METEO BAROMETRIC FEED · 6 ACTIVE NZ CIRCUITS + PUKEKOHE ARCHIVE

New Zealand Motorsport Track Air Density, Barometric Pressure & ECU Air-Mass Trim Board

Real-time meteorological telemetry across New Zealand’s six active FIA/MSNZ motorsport circuits—computing dry and humid air density (ρ kg/m³), Relative Air Density (RAD %), Density Altitude (m), and baseline Speed-Density / Mass-Airflow ECU fuel and ignition trim corrections.

RAG Engineering Summary — Relative Air Density (RAD %)

Relative Air Density (RAD %) expresses ambient track air density relative to the ICAO Standard Atmosphere sea-level reference (1.225 kg/m³ at 15°C and 1013.25 hPa). Every 1.0% drop in RAD reduces naturally aspirated oxygen mass flow by ~1.0% and lowers turbocharger compressor inlet density proportionally.

Live Circuit Telemetry Cards (30-Minute Cron Sync)

Backed by open dataset /api/v1/nz-track-air-density.json

Download Live JSON Dataset MAP Sensor Calibrations

North Waikato, NZ · 3.8 km · Elev 55m

Hampton Downs Motorsport Park

ACTIVE

Ambient Temp 12.9°C

Surface Baro 1016.7 hPa

Rel Air Density 100.73%

Density Alt -76 m

Humidity / Wind 62% · 19.1 km/h

ECU VE Trim +0.73%

ρ = 1.2339 kg/m³ GPS: -37.354, 175.076

Taupō, Central Plateau, NZ · 3.32 km · Elev 408m

Taupō International Motorsport Park

ACTIVE

Ambient Temp 4.4°C

Surface Baro 961.3 hPa

Rel Air Density 98.21%

Density Alt 187 m

Humidity / Wind 87% · 1.6 km/h

ECU VE Trim -1.79%

ρ = 1.2031 kg/m³ GPS: -38.665, 176.144

Feilding, Manawatū, NZ · 3.03 km · Elev 72m

Manfeild Circuit Chris Amon

ACTIVE

Ambient Temp 8.0°C

Surface Baro 1009.0 hPa

Rel Air Density 101.73%

Density Alt -179 m

Humidity / Wind 81% · 4.8 km/h

ECU VE Trim +1.73%

ρ = 1.2461 kg/m³ GPS: -40.238, 175.557

Christchurch, Canterbury, NZ · 3.33 km · Elev 42m

Euromarque Motorsport Park (Ruapuna)

ACTIVE

Ambient Temp 4.0°C

Surface Baro 1011.3 hPa

Rel Air Density 103.51%

Density Alt -360 m

Humidity / Wind 83% · 12.7 km/h

ECU VE Trim +3.51%

ρ = 1.2679 kg/m³ GPS: -43.531, 172.479

Cromwell, Central Otago, NZ · 4.1 km · Elev 218m

Highlands Motorsport Park

ACTIVE

Ambient Temp 4.7°C

Surface Baro 990.4 hPa

Rel Air Density 101.14%

Density Alt -118 m

Humidity / Wind 69% · 3.8 km/h

ECU VE Trim +1.14%

ρ = 1.2389 kg/m³ GPS: -45.049, 169.168

Invercargill, Southland, NZ · 2.57 km · Elev 6m

Teretonga Park

ACTIVE

Ambient Temp 7.8°C

Surface Baro 1016.9 hPa

Rel Air Density 102.72%

Density Alt -280 m

Humidity / Wind 53% · 25.5 km/h

ECU VE Trim +2.72%

ρ = 1.2583 kg/m³ GPS: -46.445, 168.257

Pukekohe, South Auckland, NZ · 2.91 km · Elev 64m

Pukekohe Park Raceway

Historical Archive — Closed April 2023

Motorsport operations at Pukekohe Park ceased in April 2023. Retained strictly as a historical reference baseline for comparing 2017–2023 Emtron/MoTeC datalogs. Baseline sea-level barometric reference: 1005.6 hPa / 97.8%–101.4% RAD.

HISTORICAL TELEMETRY BASELINE GPS: -37.219, 174.920

Interactive Track-Side Air Density & ECU Trim Calculator

Enter your pit-lane weather station reading (Kestrel / Vaisala) to calculate exact humid air density via Tetens saturation vapour pressure and ideal gas law for dry air + water vapour.

ρ = (P_dry / (R_d · T_K)) + (P_vapour / (R_v · T_K)) | RAD % = (ρ / 1.225) × 100

Computed Pit-Lane Atmospheric Correction

Relative Air Density & Mass Density 95.24% RAD (1.1667 kg/m³)

Equivalent ICAO Density Altitude +412 m Density Altitude

Uncompensated Open-Loop Air-Mass Delta -4.76% Base Air-Mass Correction

Note on Altitude Tracks (Taupō 405m & Highlands 215m): Always verify that your ECU uses a dedicated barometric pressure channel or key-on MAP sampling with an HV 4-Bar MAP Sensor so target boost tables reference absolute manifold pressure (kPa Abs) rather than sea-level gauge pressure.

Open-Source Motorsport CAN-Bus & Telemetry Tooling Releases

GitHub Repository	Latest Release Tag	Release Title	Published Date
collin80/SavvyCAN	V220	V220	2025-05-09
hardbyte/python-can	v4.6.1	4.6.1	2025-08-12
cantools/cantools	45.1.2	45.1.2	2026-10-29