Well, JB4 does have support for meth on all maps if set up correctly. I believe Steve@Fuel-IT gave an brief overview over on the n54tuning forums, the thread is below. If you're still under warranty though I would personally stay away from E85 for the time being. My friend had to pay out of his pocket when his hpfp failed while running only 1-2 gallons of E85 on his JB4 14 535i, I believe the bill was an hefty $1300 for parts and labor. The dealer actually ran a E85 test kit on his car as actual proof so he had no way to have it covered under warranty.
http://www.n54tech.com/forums/showthread.php?t=43764
Quote:
Originally Posted by AMTF10
Now you have me nervous running 2-3 gallons (roughly 15%) E85 in the tank as frequently as I do. I don't seem to have any misfiring issues. From a preventative maintenance standpoint, I plan on replacing my plugs and doing a walnut shell blasting at 50k miles. Anything else recommended since I'll be running a JB4 and 2-3 gallons of E85 fairly consistently?
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