Questions regarding JB4 map 0 and backend-flash

Hi all!

I have a 335i, N54, DCT with JB4 G5 ISO, everything else is stock, and still under warranty. I'm only interested in running normal fuel on map 5, not planning on doing E85 or Meth etc.


1. I'd like to do the backend flash, because I read that it makes the DCT shifts more smooth under WOT, and kickdown should be working better, since with backend flash the DME and transmission knows about the real load. Is this true?


2. I read that using SLD-wires for Vmax will void BMW warranty, because it's detectable. What about the backend-flash, I read it also disables Vmax-limit. Is it detectable by BMW? Or is it fine when I don't hit more than 250 kmh?


3. On daily driving I'm disabling JB4 (map 0), because stock power is fine then and I want to prevent wear and stuff. Is that ok?



4. Now I read that on ISO-boards, map 0 is not anymore real pass-through. Is that true? Is it just the boost that's still controlled by JB4, but targets boost from DME? Is there any measurable in power/boost difference between JB4 map 0 and no installed JB4, like more or less?


5. What about backend flash + map 0? Is it normally usable in daily driving, like stock?


Thanks in helping me out with my questions!


Greets