HARLEY DAVIDSON · MT21M ECU

HARLEY DAVIDSON SOFTAIL MT21M tuning files

HARLEY DAVIDSON SOFTAIL on the MT21M: matched, calibrated and delivered with care. Across the matched variants stock power runs from 86 to 90 HP. There are 11 distinct variants on file for this combination. Stage 1 and Stage 2 are the safe starting points for this platform. Your file is built against the exact ECU software on the car, then operator-verified.

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Available solutions

Applicable work for the MT21M on this vehicle. The available set firms up once the exact engine and software are known.

Stage 1 Stage 2

Engine variants & ECU software

11 distinct variants for the HARLEY DAVIDSON SOFTAIL on the MT21M ECU. Reference the engine and controller software when you upload.

Variant 1

ECU

Catalog engine: 1868 90HP
Controller brand: DELPHI
ECU: MT21M
Stock power: 90 HP
SW upgrade: 41000884D
Calibration: 41000884D

Variant 2

ECU

Catalog engine: 1868 90HP
Controller brand: DELPHI
ECU: MT21M
Stock power: 90 HP
SW upgrade: 000000000
Calibration: 000000000

Variant 3

ECU

Catalog engine: 1868 90HP
Controller brand: DELPHI
ECU: MT21M
Stock power: 90 HP
SW upgrade: 41000862E
Calibration: 41000862E

Variant 4

ECU

Catalog engine: 1868 90HP
Controller brand: DELPHI
ECU: MT21M
Stock power: 90 HP
SW upgrade: 41000897E
Calibration: 41000897E

Variant 5

ECU

Catalog engine: 1868 90HP
Controller brand: DELPHI
ECU: MT21M
Stock power: 90 HP
SW upgrade: 41000901D
Calibration: 41000901D

Variant 6

ECU

Catalog engine: 1868 90HP
Controller brand: DELPHI
ECU: MT21M
Stock power: 90 HP
SW upgrade: 41000894C
Calibration: 41000894C

Variant 7

ECU

Catalog engine: 1868 90HP
Controller brand: DELPHI
ECU: MT21M
Stock power: 90 HP
SW upgrade: 21S114447
Calibration: 21S114447

Variant 8

ECU

Catalog engine: 1868 90HP
Controller brand: DELPHI
ECU: MT21M
Stock power: 90 HP
SW upgrade: 41000892C
Calibration: 41000892C

Variant 9

ECU

Catalog engine: 1868 90HP
Controller brand: DELPHI
ECU: MT21M
Stock power: 90 HP
SW upgrade: 41000891D
Calibration: 41000891D

Variant 10

ECU

Catalog engine: 1868 90HP
Controller brand: DELPHI
ECU: MT21M
Stock power: 90 HP
SW upgrade: 41000869D
Calibration: 41000869D

Variant 11

ECU

Catalog engine: 1795 86HP
Controller brand: DELPHI
ECU: MT21M
Stock power: 86 HP
SW upgrade: 41001144A
Calibration: 41001144A

Related vehicles

Other vehicles built on the MT21M controller or the same engine — handy when a platform spans several models and makes.

Questions, answered.

Which tuning solutions are available for the HARLEY DAVIDSON SOFTAIL on the MT21M?

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

Do you cover the MT21M ECU software on this model?

Yes — the HARLEY DAVIDSON SOFTAIL on the MT21M 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.