N54 engine swap this weekend, ECU and MHD questions

jackalope719 · 08-12-2020, 01:16 PM

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!

HydroxFrost · 08-12-2020, 01:20 PM

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.

hassmaschine · 08-12-2020, 02:25 PM

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.

08-12-2020, 01:16 PM	#1
jackalope719 New Member 0 Rep 6 Posts Drives: 08 335xi Join Date: Sep 2019 Location: Colorado iTrader: (0)	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 @Lucky.330i 39 Rep 91 Posts Drives: 2006 BMW 330i Join Date: Mar 2020 Location: Canada iTrader: (0) Garage List 2008 Jeep Compass [0.00] 2006 Chrysler 300 [0.00] 2006 BMW 330i [0.00]	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
hassmaschine Major General 3973 Rep 7,215 Posts Drives: "NBO" 330i Join Date: Jun 2014 Location: earth iTrader: (0)	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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