Quote:
Originally Posted by zeevette
Is it true that you can't run E85 without changing the fuel system?
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You can run a few gallons per tank everything else being stock with the JB4 on map 1, 2 or preferably 5 (big gains).
Anything more than say, 20% (so about 3 gallons), and you should add the BMS flex fuel wires, allowing you to safely run higher concentrations.
Above 50%, and I think some cars will start to reach the limits of the stock fuel pumps.
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'02 S54 M3 (500/500 GC/Koni)
'08 N54 135 (JB4, DCI, BMW PS/Bilstein B6s, H&R M3 FSB, Strongflex FCABs)
'14 N55 X1 (JB4, BMS DP, BMS Intake, Alpina TCU reflash, H&R Sports, Bilstein B6s, E93 M3 RSB, Strongflex FCABs, baby seat)
'08 N54 535xi touring (Bilstein B6s, Downpipes, MHD tune, baby seat)