Agricultural · ECU Remapping
Challenger Mt800 MT845B 15.2L I6 400 hp Tuning (2002–)
Factory specification and Stage 1 remap gains for the Challenger Mt800 MT845B 15.2L I6 400 hp (2002–). A Stage 1 calibration adds 50 BHP and 200 Nm — software only, no hardware modifications required.
| Measure | Original | Stage 1 |
|---|---|---|
Power BHP | 400 | 450Estimated +50 BHP · +13% |
Torque Nm | 1670Estimated | 1870 +200 Nm · +12% |
+50 BHP
Stage 1 power gain (estimated)
+200 Nm
Stage 1 torque gain (estimated)
Estimated figures are based on engine, ECU and comparable application data. Actual results can vary depending on software version, machine condition and configuration.
Power & torque curves
Illustrative Performance Curve
Illustrative curve generated from published/estimated peak figures. This is not an individual rolling-road test. Power (BHP, solid) and torque (Nm, dashed) across engine speed (RPM); peak figures match the published database values.
Hover / touch the graph
Stock: 400 bhp · 1670 Nm (peak)
Stage 1: 450 bhp · 1870 Nm (peak)
Tuning tool compatibility
This ECU was not found in the manufacturer compatibility databases we cross-reference.
AutoTuner
Not listed
Not found in this manufacturer's published data — ask us, coverage updates frequently.
Alientech KESS3
Not listed
Not found in this manufacturer's published data — ask us, coverage updates frequently.
Magicmotorsport FLEX
Not listed
Not found in this manufacturer's published data — ask us, coverage updates frequently.
Dimsport New Genius / New Trasdata
Not listed
Not found in this manufacturer's published data — ask us, coverage updates frequently.
Existing customers upload their ECU file via the Regal Tuning File Portal. New to Regal? Request a quote first.
20+ years of ECU calibration
Ready to unlock your Challenger Mt800's real performance?
Tell us your machine and registration — we'll confirm support and the exact expected gains for your engine before any work begins.