Thread: 2020 M340i JB4
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      04-17-2020, 09:13 AM   #55
jstnstr
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Drives: G20 M340xi
Join Date: Apr 2012
Location: SWFL

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Quote:
Originally Posted by rd.m340x View Post

Would I need to modify to run E85 on the car? are Map4 and 6 ready to go or need to do adjustments depending if running ethanol or not?
To run pure E85, yes you'd need to modify it. To run an E85 mixture less than say 50%, no you don't need to modify, just need the JB4. Put in 5 gal E85, then 10.6 gal of 93 oct (if tank is empty, otherwise just fill the rest with 93) gives you E35 which is perfect for map 4 or 6. Here's a quote from Terry at BMS over on N54tech regarding the version 15 firmware update:

"Revised map guide, map4 is now absolute 20psi map and map5 absolute 22psi map, especially useful for Supra/M340i applications on E85 mixtures"

I can attest to its... usefulness. I plan to do some dragy runs this weekend to see what my times look like. It's a monster off the line with xDrive.
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