DocTL-001
Edition01 / 2026
FormatPDF · 184 pp
Modules7 + extras
ScopeTool-agnostic
Price$29 intro
A plain-English written reference
Understand what you're doing before you change a single number.
A structured, tool-agnostic guide to ECU tuning. Seven modules, written like a workshop manual — calm, technical, plain English. No platform-specific button-clicking. No guru language. Just the mental model you need before you touch a fuel map.
Intro price · 7-day refund · Instant PDF
FIG 01 · Fuel map · AFR by RPM × load · Module 03TL-001 · F01
01The problem
You don't need more information. You need structure.
ECU tuning isn't hard because the information is hidden. It's hard because every source explains a different fragment, in a different order, with a different agenda. You end up with a thousand tabs open and no working model of what an ECU actually does.
You don't need another video that walks through one specific make-and-model on one specific software. You need a written reference that explains the underlying logic — fuel, ignition, boost, datalogging — so that any tutorial you watch afterward makes sense.
That's what this guide is. Seven modules. Each one builds on the last. Each one is small enough to read in a sitting and dense enough to come back to.
What you've already tried
- YouTube videos — platform-specific, skip the reasoning
- Forum threads — contradictory, no way to evaluate
- Free blog posts — explain what an ECU is, stop there
- $200+ courses — gamble on whether they're aimed at your level
02Contents · 7 modules184 pp · ~3.4 hours read
FIG · Fuel MapsM03
M03 · Fuel Maps
What the numbers actually mean. AFR, lambda, fuel trims. Why 'add fuel everywhere to be safe' is wrong.
Tuning glossary
Every term you'll meet, defined plainly. From “lookup table” to “knock retard”. No assumed vocabulary.
Datalog checklist
The minimum set of channels to log on any platform, with sample rates and what each one tells you.
Common mistakes
The handful of repeating errors that cost engines. Named, explained, and what to do instead.
03Audience
Right fit
- You've modified a car (intake, exhaust, downpipe) and the next step is a tune
- You've been quoted a remap and want to know what you're paying for
- You own tuning software (HP Tuners, Accessport, ECUFlash, VCDS) and the menus are opaque
- You've watched 20 hours of tuning videos and still can't explain what a fuel trim is
- You learn better from a written reference you can come back to than from talking-head video
Wrong fit
- You want a plug-and-play file for a specific make/model — buy a custom map instead
- You want to skip the theory and just click buttons in your tuning software
- You're looking for a step-by-step “tune my exact 2017 STi” walkthrough
- You don't plan to read 184 pages — this is a written reference, not a video course
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04FAQ
Free reference
Know what to log before you touch the throttle.
A one-page PDF: the minimum set of channels to log on any platform, with sample rates and a “what to look for” note next to each one. Free, no upsell, sent to your inbox.
Datalog · Channels
- RPM
- Throttle position
- Manifold pressure (MAP)
- Mass airflow (MAF)
- Air-fuel ratio (wideband)
- Short-term fuel trim
- Long-term fuel trim
- Ignition advance
- Knock retard
- Boost target vs actual
- Wastegate duty
- Coolant temperature
- Intake air temperature
// 30 Hz min · 50–100 Hz at WOT