TracQi OBD2

Not a code reader.
The next generation.

Most OBD2 apps read a code and stop. TracQi keeps a living history of your car, explains it in plain language, and answers the one question that actually matters: did that change make your car faster, or just lighter in the wallet?

Find the limit-> Make the change-> Prove it worked

Watch it in action

The hidden variable

The biggest factor in your power?
The weather.

Air density, driven by temperature, pressure, and altitude, is the single largest influence on what your engine makes. A modern ECU targets consistent output across all conditions, so it quietly works the engine harder in hot, thin air and backs off in cold, dense air. Miss this, and you'll chase power in all the wrong places.

Cold and dense

High density altitude headroom

Air densityHigh - more O2

ECU effortRelaxed

HeadroomPower left on the table

ECU target output

Same target, very different effort. The headroom only unlocks with a tune, not bolt-ons alone.

Hot and thin

Low density, high stress

Air densityLow - less O2

ECU effortAggressive

HeadroomAt the ragged edge

This is why a stack of mechanical mods can make zero extra power on OEM tuning. The ECU just trims back to its target. TracQi shows you where the mechanical parts and the tune are the real limit, so the next dollar you spend actually moves the needle.

The TracQi loop

Find it. Change it. Prove it.

Because TracQi corrects every run to SAE standard conditions and tracks density altitude, it can tell the difference between a real gain and a lucky cold morning. That closes the loop most enthusiasts never get to.

Find the limit

Where is the tune holding power back?
Can you run more boost or timing?
Is a mechanical part the real bottleneck?

Make the change

Intake, exhaust, downpipe, tune...
Add more power when it is cold?
Back off safely when it is hot?

Prove it worked

Did it actually add power, weather-corrected?
Or did a cold day just flatter the numbers?
Did efficiency or diagnostics regress?

TracQi CoDriver - only on TracQi

Insights that tell you why.

CoDriver reads your car's own data and explains what's happening, why it matters, and what to do next for every facet of your vehicle. No one else does this.

ObservationAcceleration-derived HP runs 20.7% below the MAF estimate in 3rd.

InterpretationA consistent airflow-vs-acceleration gap points to drivetrain loss or traction slip, not an engine fault.

Next stepRepeat a clean, high-traction pull. If the gap holds, inspect clutch and driveline before chasing engine mods.

Diagnostics

Health summary, DTC analysis, fuel trim, O2, VE

Performance

Power and torque, g-force, acceleration, airflow, weather

Efficiency

Score, MPG trend, cold-start, fuel trim, aggression

Historical snapshots - only on TracQi

Your car, on a timeline.

As you drive, TracQi automatically captures Performance, Diagnostics, and Efficiency snapshots from the same stream, building a history you can trend, compare, and use to prove a change before-and-after.

Performance

Captured around WOT events - power, torque, g, and weather-corrected output.

Diagnostics

Idle and health oriented - DTCs, fuel trim, readiness, and health score.

Efficiency

End-of-drive context - MPG, cold-start penalty, aggression, and fuel trim.

Catalog and control

A scan tool for power users.

Under the friendly dashboards is a serious diagnostic engine, with the catalog depth, custom PID support, and raw access that enthusiasts and tuners actually need.

215

J1979 / OBD-II PIDs

bundled standard parameters

203

Mode 22 enhanced PIDs

plus your own custom definitions

2,269

DTC definitions

with severity and explanations

01-0A + 22

Diagnostic modes

the full mandated set plus Mode 22

Built-in terminal

Custom Mode 22 PIDs

Define, import, and sync your own manufacturer-enhanced parameters.

Raw OBD2 terminal

Send raw AT and OBD commands with command memory and full transcript, then return to normal operation.

Multi-ECU, simultaneously

Responses are preserved with ECU headers, with engine-only targeting to cut wait time.

Adaptive high-rate logging

Live Hz readout, multi-PID batching, and weather plus motion channels in every log.

Learn - watch and do

Not how to tap buttons - how to go faster.

Every tutorial is a real job on a real car: find the limit, make the change, and use TracQi to prove it worked. Use the app and build your car at the same time.

8:24

Prove your intake actually made power

Run a weather-corrected before and after and read the real delta.