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Originally Posted by combatbmw
Bms is a good product. Again, the power loss after 5k is an issue. No alot of dyno numbers out there. Arc and I both have the same problem. And I'm beating it's just the ecu. My friends 2014 didn't have that issue. Only difference between his car and ours was our tune was on and car was adapted to it. His was on for 4 dyno pulls. The tune went on, at the dyno.
So maybe it's the ecu Adapting and saying fu bms!!
But I'm no expert. That's just my guess.
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Good theory. Shouldn't a tune be able to override the ecu?