Quote:
Originally Posted by Sleeper
+1. This is the key point for warranty-worriers when it comes to flash vs. piggyback tunes (or tune vs. not).
With a flash, be it BM3, Hex, or one of the template tuners using the Euro-sourced file, if you flash back to your actual stock map or the dealership updates your DME, you'll get the 'DME tamper' code. You can flash back to a stock performance map using BM3 (not sure about VF) but any digging whatsoever on BMW's part will quickly put that little lie to bed.
Long story short, as soon as you unlock the DME and flash it, it's really game over for being able to flash to undetectable stock mode. That's just a risk you have to take if you want to jump in to the performance game.
On the piggyback front, I'm guessing it would take about 2% more effort on BMW's part to determine if there was a tune or not.
Based on that, if you're tuned, I wouldn't bother flashing back to stock or a stock performance map if taking your car in for service/warranty. The damage was already done.
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Well.. if there really is a big tamper code that pops up after a flash where any general tech can see it I would say thats a lot easier than shipping the ECU/data off to BMW to find the JB4 traces. I do not believe any BMW dealer techs have the ability to get that deep into the ECU logs.