TL;DR — I added ProjectE to a stock Tekkit SMP v1.0.5 install, noticed most mod items had no EMC and a few had absurd values, so I spent a weekend digging in. Result: a public repo with 152 seed EMC values, 4 exploit fixes, and the Python scripts I wrote to audit everything. Drop-in for anyone running the same pack.

Repo: https://github.com/ilkerdevops/tekkit-smp-projecte-emc Modpack: https://www.technicpack.net/modpack/tekkit-smp (v1.0.5)

The problem

Tekkit SMP v1.0.5 (MC 1.12.2, Forge 14.23.5.2860) ships with ProjectE (Technic fork, PE1.4.8-14). On first boot ProjectE's auto-mapper walks every crafting recipe, every smelting recipe, every OreDict entry, and derives EMC for everything it can reach through those. In theory this gives you the classic "Wood=32 → 4×Plank=8" conservation automatically, all the way up the tech tree.

In practice, after a clean boot I got 2756 items with EMC out of ~7000 registered items. The rest came from mods that don't use vanilla IRecipe:

• Thaumcraft (Infusion Altar, Crucible, Arcane Workbench)
• Thaumic Augmentation / Wonders / Tinkerer
• Galacticraft Core + Planets (NASA Workbench)
• Industrial Foregoing (machine recipes)
• Mystcraft / MoreMystcraft (book binder)
• MFFS, Exchangers, ComputerCraft, Computronics
• MoCreatures, MagicBees, ForbiddenMagicRe

The mapper can't see their recipes, so every item from those mods gets EMC = null (or sometimes an OreDict-inherited value that makes no sense).

On top of that, logEMCExploits=true produced 43 warnings, including some that are economically devastating.

What I did

1. Inventory

Wrote a Python script that reads every mod jar, extracts blockstates/*.json (blocks) and models/item/*.json (items), then cross-references with lang/en_us.{lang,json} for registry names the asset files miss.

Output: 1878 blocks + 3377 items from blockstates, 2892 blocks + 5048 items from lang (lang-based is more complete). Committed as analysis/blocks_by_mod.md, registry_full.json.

2. Coverage measurement

Enabled pregenerate=true and dumpEverythingToFile=true in mapping.cfg, booted the server once, got a 100 KB pregenerated_emc.json with every derived EMC and a 2.4 GB mappingdump.json with the full conversion graph. Compared the dump to the registry inventory, got a per-mod "missing" count. Published as analysis/real_coverage_v2.md.

Top gap mods at that point: thaumcraft (217 missing blocks), quark (170 — mostly decorative variants, low priority), galacticraftcore (61), cathedral (84 — decorative), balkonsexpansion (253 items, 0% coverage).

3. Seeds

For each major unmapped mod, I picked the base resources — the nodes at the root of the recipe tree — and assigned EMC values anchored to vanilla reference units (Iron Ingot = 256, Diamond = 8192, Gold = 2048). Examples:

"thaumcraft:amber|0": 8,
"thaumcraft:salis_mundus|0": 64,
"thaumcraft:primordial_pearl|0": 8192,
"galacticraftcore:meteoric_iron_raw|0": 1024,
"galacticraftplanets:item_basic_mars|3": 4096,   // desh ingot
"industrialforegoing:plastic|0": 16,
"mystcraft:agebook|0": 4096,
"mocreatures:ancientsilveringot|0": 512

All 152 seed values live in config/ProjectE/customConversions/tekkitsmp_seeds.json. Once seeded, the ProjectE engine re-runs and derives downstream items automatically — second boot produced 3103 EMC entries (+347 from the seeds).

4. Exploit audit

Parsed the EMC Exploit warnings from the server log with a regex. Most (39 of 43) are 9 × nugget → 1 × ingot rounding losses — cost 252, value 256, profit 4 EMC per craft. Not exploitable at any meaningful scale, left alone.

Four are actual exploits:

The ProjectRed ones are the juiciest — a 1024 EMC resource item converts 1:1 to a 2048 EMC gemstone. An EMC condenser could double-print gems in a loop. All four are pinned in the repo.

What's in the repo

• config/ProjectE/customConversions/tekkitsmp_seeds.json — the main output, 152 seed EMC values
• config/ProjectE/custom_emc.json — includes the minecart fix
• analysis/ — Python scripts (extract_blocks.py, extract_registry_from_lang.py, real_coverage*.py, parse_exploits.py) plus markdown reports and boot logs
• Full Tekkit SMP v1.0.5 server config snapshot (no mod jars — license + size)
• README.md with install steps and the "how to add your own seed" recipe

How to use it

If you run Tekkit SMP v1.0.5:

1. Copy config/ProjectE/customConversions/tekkitsmp_seeds.json and config/ProjectE/custom_emc.json into your server.
2. Delete pregenerated_emc.json (if it exists) to force a re-map.
3. Set B:pregenerate=true in mapping.cfg, boot once, stop.
4. Set B:pregenerate=false.

First boot will take ~30 seconds longer while the mapper re-runs. ProjectE auto-appends B:tekkitsmp_seeds=true to mapping.cfg on first load, so the new conversion file gets picked up without you editing anything.

Known gaps

• Thaumcraft internal recipes (aspect-heavy items, infused tools) are only partially covered. tc_integration is installed and might extend this — I haven't fully explored its config yet.
• Decorative variant explosion (Quark, Chisel, Cathedral, ChiselsandBits combined produce ~1000 variant blocks). They're not in the seed list because their economic impact is near zero, but if anyone wants full coverage the actionable list is in analysis/actionable_missing.json.
• Steve's Carts and Balkons Expansion — their custom assemblers are invisible to ProjectE. Left at EMC=0 as safe default.

Feedback welcome

If you run Tekkit SMP and spot a seed that's miscalibrated (too cheap, too expensive, or just plain wrong) open an issue on the repo — the seeds are quick to revise. Also curious if anyone on a different 1.12.2 modpack has success reusing the seed file; most of the items should resolve as long as the mods are present.

Scripts in analysis/ are general — they work against any 1.12.2 install with ProjectE, you just point them at the mods folder. If you want to audit your own pack the same way, extract_blocks.py + parse_exploits.py will give you 80% of what I found here.

Repo is CC0 / public domain for the config and scripts. Mod jars not included (copyright and 242 MB). Built against Technic's Tekkit SMP v1.0.5.