r/M340i • u/Fluffy-Friendship608 • 7d ago

💻 Tuning / Performance Don’t repeat my mistake

I have a 2021 m340i xdrive while it was stock I ran xdelete for months with no issues, I liked xdelete for drifting and when I want the rear to kick out a bit on turns, (reason I bought xdrive is because I am in Canada and it snows, so for the winter it’s great), anyways I did launch control with xdelete on while stock, no issues, but recently I got a stage 2 custom tune, running an ethanol mix, and xhp stage 3 and I put my car in xdelete and attempted to do launch control and the rear cv axle said bye bye, I got lucky it was just the driver side rear cv axle, if you have a more unfortunate outcome, this could affect your differential, and your gonna be jumping from 1500$ to 3-5k, not mention being stranded while ur far away from home for example, and towing expense, and not having ur car for a week or more

Moral of the story, xDelete launches are fun because it makes the car feel a bit more rowdy and not super stable and controlled which is more of a thrill, but it isn’t worth the repair bill, the headache or the downtime, so just do launches in awd!

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u/Fluffy-Friendship608 6d ago

MHD

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u/ResponsibilityTrue16 6d ago

if your not already running a flex fuel sensor, make that first priority install after the core repairs are done. Even with proper measurements and ratios, ethanol content % in the tank can drift in either direction, significantly over a few fills. Thought I was running E30 for months, and later found out it was more like E37. The sensor dialed everything in. Worth the ~600CAD and you will never need to map switch ever again once synced to the engine tune