# Knowledge Base **URL:** https://community.tunersguild.com/c/knowledge-base/5.md?page=1 [Latest](https://community.tunersguild.com/latest.md) · [Categories](https://community.tunersguild.com/categories.md) · [Tags](https://community.tunersguild.com/tags.md) **Page:** 2 --- ## [What Is a Torque Limiter and How Does It Actually Work](https://community.tunersguild.com/t/what-is-a-torque-limiter-and-how-does-it-actually-work/69)
**Author:** [@ThomasPirowski](https://community.tunersguild.com/u/ThomasPirowski)\ **Replies:** 0\ **Last updated:** [March 19, 2026, 10:25am UTC](https://community.tunersguild.com/t/what-is-a-torque-limiter-and-how-does-it-actually-work/69 "2026-03-19T10:25:00Z")
Most people who touch a torque limiter don’t actually know what it is. They see a value, they raise it, the car pulls harder — and they think they understood something. They didn’t. The ECU doesn’t control power. It con… --- ## [Lambda Control in Gasoline ECU — Why AFR Matters More Than You Think](https://community.tunersguild.com/t/lambda-control-in-gasoline-ecu-why-afr-matters-more-than-you-think/65)
**Author:** [@ThomasPirowski](https://community.tunersguild.com/u/ThomasPirowski)\ **Replies:** 0\ **Last updated:** [March 16, 2026, 12:45pm UTC](https://community.tunersguild.com/t/lambda-control-in-gasoline-ecu-why-afr-matters-more-than-you-think/65 "2026-03-16T12:45:00Z")
In diesel tuning, you target power. In gasoline tuning, you target AFR — and then you get power as a result of getting it right. What lambda control actually does The gasoline ECU runs a closed-loop control system arou… --- ## [Solid File vs Hollow File — How to Evaluate a Purchased Calibration](https://community.tunersguild.com/t/solid-file-vs-hollow-file-how-to-evaluate-a-purchased-calibration/59)
**Author:** [@ThomasPirowski](https://community.tunersguild.com/u/ThomasPirowski)\ **Replies:** 0\ **Last updated:** [March 9, 2026, 10:25am UTC](https://community.tunersguild.com/t/solid-file-vs-hollow-file-how-to-evaluate-a-purchased-calibration/59 "2026-03-09T10:25:00Z")
Not all purchased calibration files are equal. Some are solid — real engineering work on the right maps, consistent across the ECU’s torque model. Others are hollow — a few numbers changed to make the dyno graph look dif… --- ## [What is FMTC in Diesel ECU? Why Deleting It Is More Complicated Than You Think](https://community.tunersguild.com/t/what-is-fmtc-in-diesel-ecu-why-deleting-it-is-more-complicated-than-you-think/58)
**Author:** [@ThomasPirowski](https://community.tunersguild.com/u/ThomasPirowski)\ **Replies:** 0\ **Last updated:** [March 6, 2026, 8:08am UTC](https://community.tunersguild.com/t/what-is-fmtc-in-diesel-ecu-why-deleting-it-is-more-complicated-than-you-think/58 "2026-03-06T08:08:00Z")
FMTC. Four letters that cause more confusion in diesel calibration than almost anything else. Half the forums will tell you “just delete FMTC.” The other half say touching it will “break the torque model.” Both camps ar… --- ## [EDC16 vs EDC17: What's Different and Why It Matters for Calibration](https://community.tunersguild.com/t/edc16-vs-edc17-whats-different-and-why-it-matters-for-calibration/57)
**Author:** [@ThomasPirowski](https://community.tunersguild.com/u/ThomasPirowski)\ **Replies:** 0\ **Last updated:** [March 5, 2026, 7:42am UTC](https://community.tunersguild.com/t/edc16-vs-edc17-whats-different-and-why-it-matters-for-calibration/57 "2026-03-05T07:42:00Z")
If you’ve worked with both EDC16 and EDC17 files, you already know they feel different in WinOLS. The maps are in different places, some concepts are named differently, and what worked on EDC16 doesn’t always translate d… --- ## [Can You Do ECU Reverse Engineering Without Programming Knowledge?](https://community.tunersguild.com/t/can-you-do-ecu-reverse-engineering-without-programming-knowledge/55)
**Author:** [@ThomasPirowski](https://community.tunersguild.com/u/ThomasPirowski)\ **Replies:** 0\ **Last updated:** [March 4, 2026, 12:45pm UTC](https://community.tunersguild.com/t/can-you-do-ecu-reverse-engineering-without-programming-knowledge/55 "2026-03-04T12:45:00Z")
This comes up constantly: “I’m not a programmer. Can I really do reverse engineering?” Yes. And here’s why. Reading assembler for ECU analysis is nothing like writing software. You don’t need to invent logic. You don’t… --- ## [How DPF Regeneration Works Inside the ECU (And Why It Matters for Stage 1)](https://community.tunersguild.com/t/how-dpf-regeneration-works-inside-the-ecu-and-why-it-matters-for-stage-1/33)
**Author:** [@ThomasPirowski](https://community.tunersguild.com/u/ThomasPirowski)\ **Replies:** 0\ **Last updated:** [February 9, 2026, 3:55pm UTC](https://community.tunersguild.com/t/how-dpf-regeneration-works-inside-the-ecu-and-why-it-matters-for-stage-1/33 "2026-02-09T15:55:00Z")
If you work with diesel ECUs, you will deal with DPF. Here’s what’s actually happening inside the ECU during a regen. Step 1: Soot load estimation The ECU doesn’t directly measure soot. It calculates it using the diffe… --- ## [How to Use Ghidra for ECU Reverse Engineering: The 5 Windows You Actually Need](https://community.tunersguild.com/t/how-to-use-ghidra-for-ecu-reverse-engineering-the-5-windows-you-actually-need/32)
**Author:** [@ThomasPirowski](https://community.tunersguild.com/u/ThomasPirowski)\ **Replies:** 0\ **Last updated:** [February 9, 2026, 2:33pm UTC](https://community.tunersguild.com/t/how-to-use-ghidra-for-ecu-reverse-engineering-the-5-windows-you-actually-need/32 "2026-02-09T14:33:00Z")
The first time most people open Ghidra, they close it within ten minutes. The interface looks like something from a 1990s aerospace project — multiple floating windows, panels everywhere, terminology from academic comput… --- ## [EGR Delete: What You Must Change in the ECU Beyond Disabling the Valve](https://community.tunersguild.com/t/egr-delete-what-you-must-change-in-the-ecu-beyond-disabling-the-valve/30)
**Author:** [@ThomasPirowski](https://community.tunersguild.com/u/ThomasPirowski)\ **Replies:** 0\ **Last updated:** [February 6, 2026, 11:50am UTC](https://community.tunersguild.com/t/egr-delete-what-you-must-change-in-the-ecu-beyond-disabling-the-valve/30 "2026-02-06T11:50:00Z")
EGR removal is one of the most common jobs in diesel calibration. It’s also one of the most commonly done wrong. What EGR actually does in the ECU model EGR is integrated into the ECU’s air mass model. The ECU calculat… --- ## [Diesel Stage 1 Tuning: Step-by-Step Process Explained (Rail Pressure, SOI, Smoke Limit)](https://community.tunersguild.com/t/diesel-stage-1-tuning-step-by-step-process-explained-rail-pressure-soi-smoke-limit/29)
**Author:** [@ThomasPirowski](https://community.tunersguild.com/u/ThomasPirowski)\ **Replies:** 0\ **Last updated:** [February 5, 2026, 10:25am UTC](https://community.tunersguild.com/t/diesel-stage-1-tuning-step-by-step-process-explained-rail-pressure-soi-smoke-limit/29 "2026-02-05T10:25:00Z")
I’ve calibrated diesel ECUs for over 30 years. In that time, Stage 1 diesel tuning has become the bread and butter of this industry — and also the area where I see the most avoidable mistakes. This post is my attempt to … --- ## [Rail Pressure: When to Touch It and When Not To](https://community.tunersguild.com/t/rail-pressure-when-to-touch-it-and-when-not-to/27)
**Author:** [@ThomasPirowski](https://community.tunersguild.com/u/ThomasPirowski)\ **Replies:** 0\ **Last updated:** [February 4, 2026, 8:08am UTC](https://community.tunersguild.com/t/rail-pressure-when-to-touch-it-and-when-not-to/27 "2026-02-04T08:08:00Z")
Rail pressure is one of the most powerful levers in a diesel tune. It’s also one of the most commonly abused ones. Here’s my rule of thumb after 30 years: if you don’t know why the factory set it where they did, don’t m… --- ## [Driver Wish Map — Why Raising Values Doesn't Give More Power](https://community.tunersguild.com/t/driver-wish-map-why-raising-values-doesnt-give-more-power/26)
**Author:** [@ThomasPirowski](https://community.tunersguild.com/u/ThomasPirowski)\ **Replies:** 0\ **Last updated:** [February 3, 2026, 7:42am UTC](https://community.tunersguild.com/t/driver-wish-map-why-raising-values-doesnt-give-more-power/26 "2026-02-03T07:42:00Z")
The Driver Wish map is probably the most misunderstood map in a diesel ECU file. I’ve seen calibrators raise every value in it by 20% and then wonder why the car didn’t respond. Let me explain what this map actually doe… --- ## [How Diesel ECU Torque Model Works: Why Fuel Comes Last](https://community.tunersguild.com/t/how-diesel-ecu-torque-model-works-why-fuel-comes-last/19)
**Author:** [@stanislav](https://community.tunersguild.com/u/stanislav)\ **Replies:** 0\ **Last updated:** [February 3, 2026, 6:15am UTC](https://community.tunersguild.com/t/how-diesel-ecu-torque-model-works-why-fuel-comes-last/19 "2026-02-03T06:15:00Z")
This is one of the things that trips people up when they first open a diesel ECU file. They go looking for the injection duration map and start pulling values. The car responds. They think they understand what happened. … [Previous page](https://community.tunersguild.com/c/knowledge-base/5.md)