Quote:
Originally Posted by Steve @ BMS/Fuel-It!
If you want to run E85, I'd recommend doing a backend flash as well. Our M5 runs straight E85 (E54 here) with the JB4 and a BM3 flash. Without the flash you will be really limited on the ethanol content you can run. The other option is to run meth as well.
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Would the M5 BEF be suitable for the X5M?
There's some discussion regarding fueling in this thread >
http://n54tech.com/forums/showthread.php?p=532666
I run an E30 mix with 98RON (93AKI) and 107RON E85 - roughly 20L per 85L tank with no issues.