TracQi OBD2
Coming SoonFitness for Your Car
Three connected apps
From OBD2 port
to finish line.
Every data point from your car's diagnostic port - read it, log it, and race it. Three connected apps, one TracQi account.
TracQi DragStar
Coming SoonRoad Dyno in Your Pocket
TracQi TrackStar
Coming SoonYour Chronograph CoDriver
50+
PIDs Tracked
18K+
DTC Codes
3
Connected Apps
Web
Analysis Workspace
TracQi OBD2
Fitness for Your Car
TracQi OBD2 turns any ELM327 or OBDLink adapter into a professional-grade scan tool. Connect in seconds, read and clear faults across every ECU, stream 50+ live parameters, and log your drives at up to 50 Hz - then watch how your car's health, performance, and efficiency change over time.
01 / 05 · Home
Connect & read in seconds
The moment you plug in, TracQi maps your car and shows you everything that matters.
- One-tap pairing with any ELM327 or OBDLink adapter over BLE or SPP
- Live ECU network map - see every controller that's online
- At-a-glance health: active faults, readiness monitors, and protocol info
02 / 05 · Diagnostics
Read & clear every fault
Stored and pending trouble codes from every ECU, decoded into plain English.
- 18,000+ DTC decoder with severity ratings, descriptions, and repair guidance
- Freeze-frame data so you see the exact conditions a code triggered under
- One-tap Clear DTCs and re-scan to confirm the fix
03 / 05 · Readiness
Pass emissions, first try
Know whether you're test-ready before you ever leave the driveway.
- All 10 OBD2 readiness monitors tracked per controller
- Clear passed / incomplete status with TracQi Codriver explanations
- Per-ECU breakdown so a single incomplete monitor never surprises you
04 / 05 · Gauges
Live gauges, your layout
Build the dashboard you actually want and watch it move in real time.
- Custom dashboards from 50+ live PIDs - RPM, speed, boost, air flow, temps
- Mode 22 enhanced PIDs for manufacturer-specific parameters
- Smooth real-time dials that update as fast as your adapter can talk
05 / 05 · Logger
Log every millisecond
High-rate, multi-channel data logging built for catching fast transients.
- Multi-PID logging at up to 50 Hz with a live sample-rate readout
- Charted as you drive, then replayable from History
- Capture full sessions for tuning, troubleshooting, and trend analysis
Historical snapshot profiles
Diagnostics
Fault & health timeline
Every scan saved as a snapshot - DTC history, readiness trends, and your health score plotted over time so you can spot a problem developing.
Performance
Power & response
Peak RPM, boost, and throttle response captured per session, so you can compare runs and see how a mod or a repair actually changed things.
Efficiency
Fuel & load trends
Fuel trims, engine load, and consumption logged across drives - catch efficiency drift early and prove the difference after a tune-up.
Under the hood
Serial Terminal
Send raw OBD and AT commands and watch the live response - full low-level access for power users.
Mode 22 PIDs
Read manufacturer-specific enhanced parameters far beyond generic Mode 01 data.
50 Hz Logging
High-rate multi-PID capture fast enough to catch transient spikes and dropouts.
Health Score 0-100
A proprietary score that rolls readiness monitors and active DTCs into one number.
18,000+ DTC Decoder
Severity, plain-English descriptions, and repair guidance for thousands of codes.
Trend Analytics
Track fuel trims, health scores, and performance over weeks and months, not just live.
TracQi DragStar
Phone-Only Performance Testing
TracQi DragStar turns your phone into a complete performance lab. Our proprietary sensor fusion samples location, velocity, and acceleration at 50 Hz - no external box, no GPS puck, just the phone in your hand. Run a drag race at any distance, measure any acceleration split, and pull a full road dyno with crank and wheel power corrected for wind resistance and driveline loss.
01 / 05 - Home
Pick your test, see your bests
Open the app and your run count, best quarter-mile, and peak power are right at the top - per vehicle.
- Three modes one tap away: Drag Race, AnySpeed, and Road Dyno
- Live bests up top - runs, quarter-mile ET, and peak HP
- Pair an OBD2 adapter for live RPM, or run phone-only
02 / 05 - Drag Race
Race any distance
Full drag-strip timing with live splits, trap speed, and g-force - for any distance you choose.
- Run 60 ft, 330 ft, 1/8, 1/4 mile, or a custom distance
- Live distance and velocity splits with trap speed at the line
- Real-time speed, distance, and peak-g as you launch
03 / 05 - AnySpeed
Any acceleration split
Measure 0-60, 0-130, a 40-100 roll-on, or any speed range you define.
- Define any start and end speed - not just 0-60
- Live gauge, g-meter, and elapsed time through the pull
- Every attempt saved with your best-of tracked automatically
04 / 05 - Road Dyno
True power, road-tested
A full dynamometer pull from a public road - corrected for the real world and repeatable run to run.
- Live crank or wheel horsepower and torque curves
- Raw or SAE correction, with peak HP and ft-lb called out
- Accounts for wind resistance and driveline loss
05 / 05 - History
Every run, saved & comparable
Filter by mode and vehicle, then compare runs head to head over time.
- Every Drag Race, AnySpeed, and Dyno run logged with result
- Filter by mode and vehicle in one tap
- Open any run to replay splits, curves, and conditions
Inside the TracQi engine
Sensor Fusion
Phone-only precision
Our proprietary fusion blends GPS, accelerometer, and gyro into clean location, velocity, and acceleration samples - no external box, no dongle, no GPS puck.
Road Dyno
Real-world horsepower
Vehicle mass, aero, and gearing feed a physics model that corrects for wind resistance and driveline loss - producing accurate, repeatable HP and torque from any road.
Repeatability
Catch every instant
Fifty samples a second resolves launches, shifts, and roll-ons down to the hundredth - the same data rate professional timing gear runs, straight from your pocket.
Under the hood
Any-Distance Drag
60 ft, 330 ft, 1/8 and 1/4 mile, or a fully custom distance - timed to the line.
AnySpeed Splits
Any 0-X or roll-on range you define, from launch sprints to highway pulls.
Crank & Wheel Dyno
Switch between flywheel and wheel power instantly, in Raw or SAE correction.
Phone-Only
No external sensors, GPS pucks, or accelerometer boxes - just the phone.
Aero & Driveline Correction
Wind resistance and drivetrain loss accounted for, so numbers repeat run to run.
Run History & Compare
Filter, replay, and compare every saved Drag, AnySpeed, and Dyno run over time.
TracQi TrackStar
Phone-Only Lap Timing & Telemetry
TracQi TrackStar is a road-race chronographer that turns your phone into a full lap timer and telemetry rig. The same proprietary 50 Hz sensor fusion that powers DragStar positions you on track with no transponder and no beacons. Race with friends to see their lap times and track position live - on track or from the pit wall - then replay every lap, review braking points, power, and breadcrumbs, and compare laps side by side to find time.
01 / 05 - Home
Start timing in one tap
Your selected track loads armed and ready - with your lap, track, and session totals right there.
- Big Start Timing with your selected track ready to go
- Running totals - laps, tracks, and time on record
- Pair an OBD2 adapter for live RPM, or run phone-only
02 / 05 - Live Timing
Live laps, live delta
Predictive delta against your best, a live track map with sector markers, and split times as you turn them.
- Predictive delta vs. your best lap, updating mid-corner
- Live track map with sector markers and your position
- Split and sector times with gain/loss the instant you cross
03 / 05 - Track Hub
Your track command center
Pick a track, manage your library, browse community tracks nearby, or import your own.
- One tap to your selected track and its sessions
- Browse community tracks nearby or your saved library
- Import KML/GPX to build any track you want
04 / 05 - Library
A vast track library
Thousands of community tracks to search and download - or create your own from scratch.
- Search and download community tracks worldwide
- Each with length and a map preview
- Create custom tracks or import from KML/GPX
05 / 05 - History
Every session, every lap
Each session saved with your best lap, average, and lap count - tap in to replay and compare.
- Sessions logged with best lap, average, and lap count
- Open any session to replay laps and telemetry
- Compare laps side by side to find time
Inside the TracQi engine
Sensor Fusion
Phone-only positioning
The same proprietary fusion of GPS, accelerometer, and gyro that powers DragStar - accurate lap timing with no transponder, no beacons, and no external hardware.
Race with Friends
On track, together
See your friends' lap times and live track position while you're driving with them - or watch the whole session unfold from the pit wall.
Telemetry & Compare
Find your time
Replay any lap with breadcrumbs, braking points, acceleration, and power - then overlay laps side by side to see exactly where you gain and lose.
Under the hood
Vast Track Library
Thousands of community tracks to search, preview, and download worldwide.
Build Your Own
Create custom tracks from scratch or import them from KML/GPX files.
Splits & Sectors
Multi-sector timing with live gain/loss deltas the instant you cross.
Lap Replay
Replay any lap with a full breadcrumb trace of the line you drove.
Lap Telemetry
Braking points, acceleration, power, and speed captured for every lap.
Lap-by-Lap Compare
Overlay laps to see exactly where your time comes from and goes.
Only on TracQi
Your car has three stories.
TracQi tells all of them.
Most apps flash a live number and forget it. TracQi keeps a running Diagnostics, Performance, and Efficiency profile for every vehicle - each one scored, trended over time, and explained by TracQi CoDriver. It's the part no code reader, dongle, or dyno app does.
42
Health Score
830
HP Peak
78
Efficiency
Diagnostics Profile
Catch the dip before the check-engine light.
TracQi scores your engine's health on every session and plots it over time - so a slow decline shows up as a trend you can act on, not a surprise on the shoulder.
42/100
Attention
318 sessions tracked
- Proprietary Health Score One 0-100 number rolling up active DTCs, readiness monitors, and live signals.
- DTC timeline See exactly when each fault code first appeared, recurred, or cleared.
- Advisory monitoring Low-severity issues flagged to watch at next service - before they escalate.
TracQi CoDriver
Watch
Observation
Long-term fuel trim is -5.9% and short-term is -1.6%.
Interpretation
The ECU is consistently pulling fuel to compensate for a richer-than-commanded mixture. The active P0130 (O2 Sensor Circuit) directly influences fuel-trim adjustments.
Suggested next step
Inspect the oxygen sensor and its wiring - resolving the O2 circuit prevents incorrect fuel-trim calculations and downstream engine issues.
Performance Profile
Watch your power build, drive after drive.
Every pull feeds a performance profile - g-force, acceleration-derived power, and how weather moves your numbers - so you can prove a mod worked instead of guessing.
830
HP peak
Trending up
0.75 g best / 0.51 g avg
- G-force trend Peak lateral and longitudinal g logged every drive and charted over time.
- Acceleration analysis MAF-derived vs acceleration-derived HP, per gear, to expose drivetrain loss.
- Weather correlation See how temperature and air density shift your power figures.
TracQi CoDriver
Watch
Observation
Acceleration-derived HP runs 20.7% below the MAF estimate in 3rd gear.
Interpretation
A consistent gap between airflow-derived and acceleration-derived power points to drivetrain loss or traction slip rather than an engine problem.
Suggested next step
Repeat a clean, high-traction pull; if the gap holds, inspect clutch and driveline before chasing engine mods.
Efficiency Profile
Find the MPG you're quietly leaving behind.
TracQi scores your fuel economy on four axes and trends them per tank and trip - so you can see what habits and conditions are costing you, and recover them.
78/100
Low
~25.0 MPG avg / 56.9 best
- Efficiency Score 0-100 MPG, consistency, fuel trim, and cold-start each scored and weighted.
- Economy trends Average and best-session MPG tracked across every tank and trip.
- Live fuel insight Average fuel rate and total burn estimated live - no flow sensor required.
TracQi CoDriver
Watch
Observation
Cold-start fuel enrichment is active on most of your short trips.
Interpretation
Frequent sub-operating-temperature drives keep the engine in open-loop enrichment, suppressing MPG and dragging down the consistency sub-score.
Suggested next step
Batch short errands into one warm-engine trip to recover several MPG and lift your overall efficiency score.
One Ecosystem.
Every Data Point.
Capture on the go. Analyze at your desk. Every TracQi app and the web dashboard share one synced garage.
CaptureSyncAnalyze
TracQi OBD2
Diagnostics / gauges / logs
DragStar
Drag / dyno / acceleration
TrackStar
Lap times / telemetry
TracQi Cloud
One garage, synced live
real-time
Web Dashboard
Bulk analysis & compare
One synced garage
Add a vehicle once. It's everywhere.
Add a car in any app and it's instantly in all of them, and on the web. Every session, profile, and tune follows, synced in real time across iOS, Android, and your browser.
iOS
Android
Web
Your Garage
2019 Audi S4
Health 78 / 318 sessions
2021 VW GTI
Health 91 / 142 sessions
Synced just now / iOS / Android / Web
The TracQi Web Dashboard
Where it gets serious.
The phone captures. The web dissects. Pull up your synced logs in bulk, overlay them, compare different vehicles, and apply pro-grade filters and normalizations to understand exactly what your car is doing.
Bulk log analysis
Load and batch-process hundreds of logs at once. No spreadsheets, no exports.
Overlay & compare runs
Stack dyno pulls, drags, and laps on one chart to see exactly what changed.
Cross-vehicle comparison
Put two different cars side by side on the same axes: yours vs. the build you're chasing.
Filters & normalization
SAE, temperature, and density-altitude corrections plus deep filters for true comparisons.
Your data, your call
Share exactly what you want, with exactly who you want.
Your vehicles and their full history belong to you. Keep them private, or open them up. Your choice, every time.
Under the hood
How It Works
From plugging in to a full performance picture, here's the engineering underneath every TracQi app.
01
Configure
Auto-build your vehicle from the OBD2 port or a VIN scan.
02
Capture
OBD2 reads PIDs at up to 50 Hz; TrueNorth fuses GPS, IMU, and OBD2.
03
Analyze
Logs land in your vehicle history and build Efficiency, Diagnostics, and Performance profiles.
01 - Vehicle configuration
It starts with your vehicle.
Two ways in, one source of truth. TracQi builds a complete vehicle configuration automatically, then every data point you ever capture attaches to it.
Connect the OBD2
Plug in and TracQi reads the vehicle and auto-builds its config.
or
Scan the VIN
Scan the VIN barcode in your door sill for an instant configuration.
Vehicle Configuration
Your car, fingerprinted
Saved to history
Every scan, run, and lap is filed to that vehicle's permanent log history.
Compare anything
Stack logs against each other - same car, or across different vehicles.
Three profiles
Builds rolling Efficiency, Diagnostics, and Performance profiles automatically.
Gets smarter
The more you drive, the more accurate your baselines and insights become.
02 - The OBD2 engine
One scan engine, in every app.
TracQi OBD2 is the diagnostic core that powers the whole suite. It speaks every mandated protocol, polls at up to 50 Hz, and talks to every controller on the bus.
Mandated protocols
| ISO 15765-4DoCAN | Dominant modern standard. CAN bus at 250 / 500 kbps, with both 11-bit and 29-bit message headers. |
| ISO 15765-2ISO-TP | Transport and network layer. Segments large diagnostic messages and reassembles them across standard CAN frames. |
| ISO 14230-4KWP2000 | Keyword Protocol 2000. Single-wire serial up to 10.4 kbaud, common in the early-to-mid 2000s. |
| ISO 9141-2K-Line | Asynchronous serial. Frequently found on Asian and European vehicles prior to widespread CAN adoption. |
| ISO 15031Emissions | Broad standard set defining emissions-related diagnostics, scan-tool comms, and data formatting. |
Capabilities
Full SAE PID set
Plus a curated subset of known manufacturer Mode 22 enhanced PIDs.
All DTCs, read and clear
Stored and pending diagnostic trouble codes across the full SAE set.
All readiness monitors
The complete OBD2 readiness monitor set, per controller.
Every ECU at once
Simultaneous messaging from all ECUs on the bus.
SPP + BLE
Classic SPP Bluetooth and Bluetooth Low Energy adapters.
Up to 50 Hz
High-rate PID polling for transient-grade data capture.
03 - TracQi TrueNorth
Positioning from a phone in your pocket.
TrueNorth is our proprietary sensor-fusion library. It hits industry-grade positioning accuracy using consumer mobile-phone sensors, the backbone of every drag, dyno, and lap measurement.
T
TracQi TrueNorth
GPS / IMU / OBD2 sensor-fusion library
KotlinKMPComposeAndroid
5.0m
Circuit RMSE
1 Hz phone GPS
4.7m
Urban RMSE
vs. roughly 8 m industry
0.48m
RTK 10 Hz RMSE
RTK fixed
Overview
Benchmarked across 90 sensor-profile combinations and 6 track types, the 10-state filter achieves 5.0 m RMSE on circuit tracks with standard 1 Hz phone GPS, matching published GNSS+MEMS IMU baselines, and 4.7 m in urban-canyon scenarios. At 10 Hz update rates the error drops to 2.2 m with standard GPS and 0.48 m with RTK.
Filter10-state Kalman fusion
InputsGPS, IMU, OBD2
Benchmark90 sensor profiles x 6 track types
Sim harnessDeterministic, 100 Hz physics
FusionMulti-rate measurement
GPS classesStandard to RTK Fixed
Position RMSE - lower is better
04 - Road dynamometer
Real horsepower, from physics.
The road dyno combines your vehicle's physical characteristics with TrueNorth's motion data, then solves for power and torque accurately and repeatably on any stretch of road.
Inputs
Vehicle weight
Tire size
Drag coefficient
Driveline loss and gearing
TrueNorth velocity and accel
Physics model
Output
Horsepowercrank and wheel
Torquelb-ft
Corrected for drag and driveline loss. Repeatable run to run.