JOHN DEERE · L21 ECU

JOHN DEERE 8370 L21 tuning files

The JOHN DEERE 8370 on the L21, mapped from stock file to finished result. Stock output across the matched variants spans 370–370 HP. There are 2 distinct variants on file for this combination. Stage 1 and Stage 2 are the safe starting points for this platform. We match the right calibration to your exact software and validate it before delivery.

Upload your file →All 8370 coverage Custom ECU tuning file service

Available solutions

Applicable work for the L21 on this vehicle. The available set firms up once the exact engine and software are known.

Stage 1 Stage 2

Engine variants & ECU software

2 distinct variants for the JOHN DEERE 8370 on the L21 ECU. Reference the engine and controller software when you upload.

Variant 1

ECU

Catalog engine: 9000 370HP
Controller brand: PHOENIX
ECU: L21
Stock power: 370 HP

Variant 2

ECU

Catalog engine: 9000 370HP
Engine code: 6090HBM01
Controller brand: PHOENIX
ECU: L21
Stock power: 370 HP
ECU SW: SW63008A
ECU HW: RE543662

Related vehicles

Other vehicles built on the L21 controller or the same engine — handy when a platform spans several models and makes.

Questions, answered.

Which tuning solutions are available for the JOHN DEERE 8370 on the L21?

Stage 1, Stage 2. The exact set depends on the specific engine and software version.

Do you cover the L21 ECU software on this model?

Yes — the JOHN DEERE 8370 on the L21 ECU is part of the catalog. Upload your original file and it is matched to the right calibration before any work is done.

How is the file delivered?

Through the TuningBay workflow with operator validation and one safe, sensible result per job. Files we deliver, we stand behind.