LSTRUCK LABSBUILD / TUNE / DRIVE

CALIBRATION • DATA • DRIVABILITY

THE TUNING
LAB.

A practical GM-truck tuning workspace built around the data that actually matters. Learn what to log, how to interpret it, and how to make one controlled change at a time.

Choose A Tuning PathWhat Should I Log?
ENGINEAirflow / Fuel / Spark
6L80 / 4L80Shifts / Converter / Torque
DATALOGSChannels / Context / Trends
LS Truck Labs • Sample Datalog Workspace
LIVE DATA
Wideband EQStable
CommandedMatched
KR ContextReview
Trans SlipTrend

CHOOSE YOUR PATH

Start With The System

Each path focuses on a subsystem so you can diagnose instead of guessing. The goal is repeatable data and small, traceable changes.

01Engine

Airflow & Idle

Baseline airflow, idle quality, throttle behavior and load transitions before chasing power.

  • Idle airflow
  • MAF / VE context
  • Throttle & load response
Open workflow →
02Fueling

Fuel & Wideband

Use commanded versus measured data to identify trends instead of tuning to a single snapshot.

  • Wideband placement
  • Fuel trims
  • Commanded vs actual
See channels →
03Spark

Spark & Knock

Separate useful knock-retard context from noise, heat, bad fuel and mechanical issues.

  • KR context
  • IAT / ECT influence
  • Repeatability
Log first →
04Transmission

6L80 / 4L80 Strategy

Shift scheduling, converter behavior, torque management and slip trends as one system.

  • Shift RPM / speed
  • TCC apply / release
  • Torque intervention
Build a process →
05Diagnostics

Datalog Reading

Learn to annotate a pull, flag the event, and compare the same operating window across revisions.

  • Channel selection
  • Markers & notes
  • Before / after comparison
Prep a log →
06Setup

Baseline Checklist

Mechanical condition comes first. Calibration cannot compensate for a failing sensor, fuel problem or transmission fault.

  • Mechanical health
  • Sensor sanity
  • Fluid / fuel / tire setup
Read checklist →

CONTROLLED PROCESS

A Better Tuning Workflow

Good calibration work is boring in the best way: repeat the same test, change one thing, and compare the result.

1

Verify

Confirm mechanical health, fuel quality, sensor plausibility and no active faults.

2

Baseline

Save the current calibration and capture a clean reference log under known conditions.

3

Isolate

Choose one subsystem and one operating window. Avoid changing several unrelated areas at once.

4

Change

Make a conservative adjustment with a note explaining exactly what changed and why.

5

Re-Test

Repeat the same test and compare trends, not just one peak number.

DATALOGGING

Core Channel Groups

A useful log should answer a question. More channels are not automatically better if the sample rate becomes poor or the data has no purpose.

Group
Priority
Why It Matters
RPM / Vehicle Speed / Gear
Baseline
Anchors every event to engine speed, road speed and operating state.
Throttle / Pedal / Load
Baseline
Shows driver request and helps separate transient behavior from steady-state behavior.
Commanded Fuel + Wideband
Baseline
Lets you compare what the calibration asked for with what the engine actually received.
Fuel Trims
Context
Useful in appropriate closed-loop conditions to spot directional fueling trends.
Spark / Knock Retard
Context
Needs temperature, load and repeatability context before drawing conclusions.
ECT / IAT / MAP / MAF
Baseline
Temperature and airflow context changes how nearly every other channel should be interpreted.
Trans Gear / Slip / TCC State
Transmission
Helps diagnose shift behavior, clutch slip trends and converter apply/release behavior.
Rule of thumb: log the fewest channels needed to answer the current question. Quality data beats a giant noisy channel list.
PUBLISHED TUNING PRACTICE

Three Rules From HP Tuners' Own Documentation

Check DTCs first

HP Tuners recommends resolving diagnostic faults before tuning because a mechanical or sensor issue can distort the performance data you are trying to use.

Save the original read

Keep an untouched copy of the vehicle's original calibration before making changes so you always have a known recovery point.

Protect sample rate

Polled channels add scanner overhead. Use vehicle defaults as a starting point, then trim the list to the question you are answering.

Open the source-backed scanner guide →

PREP YOUR DATA

Log Review Workspace

This prototype shows how the future upload-and-review flow can work. It helps a user label the test before submitting the actual HP Tuners log.

Before You Submit A Log

Include enough context that someone can reproduce what happened.

Engine / cam / intake / injector setup
Transmission / converter / rear gear
Tire size and vehicle weight estimate
Fuel type and approximate quality
Ambient / coolant / intake temperatures
Exact symptom or question
What changed since the last revision
Timestamp or marker for the event

Build A Review Note

Your structured review note will appear here.

DO THIS FIRST

Mechanical Health Before Calibration

A tune should not be used to hide a mechanical problem. Before aggressive testing, verify the vehicle is safe and mechanically sound.

  • No fuel leaks, fluid leaks, overheating or obvious driveline faults.
  • Brakes, tires and steering should be appropriate for the test being performed.
  • Use a safe, legal environment for high-load testing or chassis-dyno work.
  • Keep the original calibration and document every revision so you can recover.
  • If the data points to a hardware problem, stop tuning and diagnose the hardware first.