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BMW M8 Forum and 8 Series Forum BMW M8 and 8-Series General Discussion Anyone tune an 840 yet?

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      11-27-2020, 05:44 PM   #1
FlexGT85
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Anyone tune an 840 yet?

I'm trying to figure out if anything B58 can be applied to the 8. Is there BM3 support? MHD? Do DPs designed for other B58 cars fit?
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      11-28-2020, 01:45 AM   #2
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This here may answer your question:

https://f92.bimmerpost.com/forums/sh....php?t=1777694

And yes both the BM3 and the MHD flasher support the B58 engine with their flash ECU tunes. And BOTH are great options, the MHD being the cheaper of the two from a price standpoint.
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      10-25-2023, 10:45 PM   #3
Dan1021
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Do you have to send your ECM to them to unlock? 2023 840XI GC
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      10-26-2023, 11:00 AM   #4
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Quote:
Originally Posted by Dan1021 View Post
Do you have to send your ECM to them to unlock? 2023 840XI GC
Yes - all ECU’s from part way through 2020 onwards require a bench unlock.
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