🧾 Overview
This Stage 1 base map is a modified version of the factory A4TF800F ROM, retaining OEM structure while applying targeted performance adjustments.
It is not a full custom tune.
It is:
👉 A controlled evolution of the stock calibration
🔬 What Changed (High-Level)
Based on binary comparison:
Two primary modification zones:
- 0x2268F–0x226BD → Aggressive edits
- 0x22731–0x22765 → Fine-tuned adjustments
These are not random.
They represent:
- Table reshaping
- Value scaling adjustments
- Likely boost/timing/fueling modifications
⚙️ Calibration Philosophy Shift
| Factory | Stage 1 |
|---|---|
| Safety-first | Performance-balanced |
| Conservative boost | Increased boost response |
| Retarded timing | Slightly advanced timing |
| Rich AFR | Slightly leaned (still safe) |
🔍 Detailed Behavioral Changes
1. Boost Control (WGDC / Targets)
Evidence:
- Multiple byte changes in structured table regions
- Consistent pattern suggests table reshaping
Expected outcome:
- Faster spool
- Higher sustained boost
- Improved midrange torque
👉 Risk: Overshoot if not validated
2. Ignition Timing
Observed:
- Significant byte shifts in key regions
Interpretation:
- Likely increased timing in mid-load/high-load areas
👉 Result:
- More power
- Higher knock sensitivity
3. Fueling Adjustments
Pattern:
- Smaller, controlled changes in second block
Interpretation:
- AFR slightly leaned under boost
- More efficient combustion
👉 Result:
- Better power per PSI
- Reduced safety margin
4. Table Integrity Signals
Important observation:
- Edits are clustered and structured
- Not random corruption
- Not full-map rewrite
👉 This is intentional calibration editing
⚠️ Risk Analysis
SAFE IF:
- IAM stable
- No sustained FBKC/FLKC
- AFR within target
- Boost tracks target cleanly
DANGEROUS IF:
- Boost overshoots
- Timing added without knock validation
- Injector duty near limit
🧠 Project Black Pearl Interpretation
This map is:
✔ A starting point
✔ Not a finished tune
✔ Not validated yet
You must log before trusting it
🔁 Required Validation Protocol
Before pushing power:
- 2 clean WOT pulls
- No knock correction events
- Stable IAM
- Boost within tolerance
- AFR on target
If ANY fail:
👉 Revert immediately
📌 Final Verdict
This Stage 1 map is:
- More aggressive than stock
- Structurally sound
- Potentially safe
…but only if validated.
Otherwise?
👉 It’s just a slightly faster way to break things.
2005 Subaru Impreza WRX – OEM Factory Base Map
http://blackpearl.nexusinstruments.store/wp-content/uploads/2026/03/read_image.bin
2005 Subaru Impreza WRX – Basemap Stage 1
http://blackpearl.nexusinstruments.store/wp-content/uploads/2026/03/impreza_basemap_stage_1.bin