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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > N54 engine swap this weekend, ECU and MHD questions



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      08-12-2020, 01:16 PM   #1
jackalope719
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N54 engine swap this weekend, ECU and MHD questions

Howdy, I'm swapping my 207k mile N54 engine with a 70k mile N54 this weekend.

I'm currently debating whether I should use the ECU from the other engine, as it its a complete engine ready to install.

My current engine/ECU are running MHD stage 2+, does anyone know if I will have to purchase the MHD software again for the new engine, if I use that ECU?

Or would I just need to code my cars VIN to the new ECU?

Thanks!
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      08-12-2020, 01:20 PM   #2
HydroxFrost
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Hey, this is the forum for the N52 NA engine not the N54. But I think you'll probably have to code your vin to the new ecu regardless. If you don't and it works fine, you'd have to purchase the software again.
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      08-12-2020, 02:25 PM   #3
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Unless you want to swap your keys and CAS too - just stick to your original DME. It's not really a "wear item", and unless it's an MSD80 with blown mosfets, there's no real advantage or reason to change it.
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