Thread: '03 F30 N55 XD with 8-Speed "Under Tuned"?
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      09-07-2017, 12:06 AM   #1
bimmerace
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Drives: F30 335i xDrive M-Sport
Join Date: Apr 2016
Location: East

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'03 F30 N55 XD with 8-Speed "Under Tuned"?
My car just reached 85k miles, and I've noticed that the tranny isn't downshifting like it used to. Could it be that the ecu is set to a lower tune after XXX miles to prolong life?
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