Quick answer
Current Subnautica2.gg, Subnautica2Hub, and Wikily data list Engine Efficiency as a locked Tadpole module crafted at the Modification Station with Titanium Ingot x1, Glass x2, and System Chip x1. The module reduces Tadpole power use by 20% and stacks up to four times for a listed max of 80%. Console Pulse also reports an Engine Efficiency pickup inside the Alien Ruins route.
Field notes for power savings
One module changes route comfort
The first Engine Efficiency module is often more valuable than chasing a perfect stack. It stretches ordinary Tadpole trips before you are ready for long rare-material loops.
System Chip is the real trade
Titanium Ingot and Glass are visible costs, but System Chip often competes with other upgrades. Craft the module when vehicle uptime is the next bottleneck.
Pickups and crafted copies can coexist
If your route finds an Engine Efficiency pickup, use it. Later crafted copies can still support longer loops once Modification Station recipes are stable.
Engine Efficiency craft plan
Check whether you already found one
Console Pulse reports a module pickup inside the Alien Ruins. If you picked it up during the Modification Station route, slot it before spending materials on a duplicate.
Unlock the recipe before farming
The blueprint pages list Engine Efficiency as locked or scan-unlocked. Check the Modification Station menu first, then decide whether the next job is scan progress or materials.
Prepare the processed inputs
Titanium Ingot x1 and System Chip x1 both hide earlier material chains. Have Processor access, Silver/Wiring Kit planning, and Quartz storage settled before you call the recipe easy.
Craft it for long routes
The value is range. Use Engine Efficiency when Tadpole trips are limited by power or when you are running repeated Alien Ruins, Atacamite, or deeper material loops.
Stack only if the route deserves it
Current data says the effect stacks up to four times. That is useful, but four module slots is a real cost. Keep at least one slot free if another module solves a bigger problem.
Power-saving loop
Find
Alien Ruins
Check for the pickup before crafting.
Craft
Module
Titanium Ingot, Glass, System Chip.
Run
Long routes
Lower Tadpole power use by 20% per module.
Engine Efficiency checklist
| Need | What to confirm |
|---|---|
| Station | Modification Station in current blueprint data. |
| Unlock | Locked / scan wording in public data; check your save first. |
| Titanium Ingot x1 | Processor chain, not raw Titanium. |
| Glass x2 | Easy to forget if Quartz is stored elsewhere. |
| System Chip x1 | Wiring Kit plus Quartz chain in current guides. |
Do not fill every slot just because it stacks
Four Engine Efficiency modules may save a lot of power, but four occupied slots can also block depth, scan, or safety upgrades. Match the slot plan to the route, not the tooltip.
FAQ
How do you craft Engine Efficiency in Subnautica 2?
Current blueprint data lists Titanium Ingot x1, Glass x2, and System Chip x1 at the Modification Station.
What does Engine Efficiency do?
Current data says it reduces Tadpole power use by 20% and stacks up to four times, for a listed max of 80%.
Can you find Engine Efficiency without crafting it?
Console Pulse reports a pickup inside the Alien Ruins route. Check that before spending rare inputs on a duplicate.
Is Engine Efficiency better than depth upgrades?
Not always. Efficiency extends range, but depth modules open routes. Pick the module that solves the next blocker.