 2019 BMW 440i On E40 Map with E50 in tankBeen running into boost issues. MHD support claims altitude is the problem. Fueling looks good, temps look good. Load and boost targets not being met
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12/28/2025
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Testing E40 |
11/03/2025
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2019 BMW 440i MHD Stage 2+ E40 Map Modifications: Catless Downpipe | Supra/Tu High pressure fuel pump | Dual resonator delete | Quaife Limited Slip Differential |
I had some issues where boost was falling short by about 4psi on average. Vehicle checked by mechanic for boost leaks and none found on smoke test. Re-flashed MHD and issue resolved.
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05/22/2025
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2019 BMW 440i MHD Stage 2 Limp/misfire issue Stage 2 MHD was mapped and the vehicle went into limp after consecutive runs. 5th gear @ +-7k rpm. Multiple misfires were logged. Vehicle thereafter stopped and restarted with no errors after clearing codes. Vehicle currently running without issue. Current log is latest run after clearing codes and reflashing map.
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07/24/2024
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2019 BMW 440i MHD Stage 2+ E40 Map with E50 in tank 3 Modifications: Catless Downpipe | Supra/Tu High pressure fuel pump | Dual resonator delete
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02/25/2024
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