rusefi_documentation/uaefi121.md

# uaEFI 121

[rusEFI store](https://www.shop.rusefi.com/shop/p/uaefi121)

## Software

[uaEFI Stable Release](https://github.com/rusefi/rusefi/releases/latest/download/rusefi_bundle_uaefi121.zip) [uaEFI Latest Snapshot](https://rusefi.com/build_server/rusefi_bundle_uaefi121.zip)

## Community Support

🔴Community support ONLY 🔴 https://www.facebook.com/groups/rusEfi 🔴 [Discord](https://github.com/rusefi/rusefi/wiki/Discord)🔴

Nicer sibling of https://github.com/rusefi/rusefi/wiki/uaefi

[Interactive Pinout](https://rusefi.com/docs/pinouts/hellen/uaefi121/)

* sequential 8 cylinder injection
* individual 6 cylinder ignition / batch fire 8 cylinder ignition
* smart coils by default, expandable with on-board IGBT igniters to drive legacy coils
* six additional low side outputs
* dual on-board WBO controller
* dual Drive By Wire electronic throttle body
* one 2A high side output
* two VRs: one MAX9924 one VR-discrete
* knock sensor input
* 121 pin header (40P+81P) (81 female plug 1355171-1/368389-1/368382-1/1J0906385C) (40 female plug 0-1355172-1/038906379B)
* metal enclosure
* Optional on-board EGT
* Optional on-board MAP sensor
* Comes WITHOUT waterproofing considerations - please add your own potting!
* looking for proper 8 cylinder individual? that's https://www.shop.rusefi.com/shop/p/rusefi-huge
* matching USB cap sold separately CAP-WADMLPC2

![WhatsApp Image 2024-09-09 at 10 57 21_3ee4ad45](https://github.com/user-attachments/assets/6e7067ff-88e9-4c5a-b931-36282d51f37c)

![WhatsApp Image 2024-09-09 at 10 58 00_06a45a89](https://github.com/user-attachments/assets/a7eff9ac-6a69-46c1-b14f-b930f2459e2f)

[Schematics rev b](Hardware/Hellen/uaefi121-b-schematic.pdf)
[uaEFI interactive BOM rev B](https://rusefi.com/docs/ibom/uaefi121-b-ibom.html)

## FAQ

### Q: Is there going to be gerbers and bom list etc available for uaefi121?

A: there are no plans to make this unit open source hardware at the moment. Same for mega-uaefi hellen module.

### Q: I have questions

A: part of the context is fact that uaefi121 is a sibling of fully open source https://github.com/rusefi/uaefi/ so much of https://github.com/rusefi/rusefi/wiki/uaEFI applies

## Changelog

### rev B

* pin 108 ignition key added
* silkscreen improvements

### rev A

it's alive!