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yellowfin yellowfin is offline
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Posts: 93
Join Date: May 2016
Car: 335xi - jb4 - DCI
Default 07-17-2019, 10:58 PM

I think E50 is the sweet spot for stock DI. I just replaced my 1st gen hpfp (2007 vintage). It did have a few hiccups now and then, but notably not necessarily at the highest boost levels, and often hit 21-22psi (GC lites) with no problem, at AFR 12.3 and 11-12 degrees. BG 44k once in a while seemed to help, too, but maybe I'm dreaming this up, also altitude (5600') might be a consideration. Overall, the old hpfp kept up bravely, and I'm not sure yet if the new hpfp, latest revision, is any better. My guess is with pure E85, you'll see the limit, but I'll be interested to see the results. My current setup is for maximizing output on stock DI, maybe I'll do PI later, if only to keep the intake clean(er).


2007 335xi (I8A0S kline) -- VTT GC lites + inlets + outlets -- Fuel-it stg 2 lpfp -- CPE catted **, FMIC, CP -- Tial BOV -- BMS DCI + OCC
JB4 + BMS bef (E50)
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