BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > First try JB4/DCI with Map 5 and 40/60 E85

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      11-29-2012, 01:08 PM   #1
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boostbuddy's Avatar

Drives: 2009 E92 335i LeMans Blue
Join Date: Oct 2012
Location: Pleasant Hill, CA

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First try JB4/DCI with Map 5 and 40/60 E85

After reading lots of posts, I decided to try JB5 map 5 with 6 gallons of E85 and 10 gallons of 91 octane or about 38%. I'm lucky enough to have E85 within 5 miles of home/work. I saw about 16-17 psi of boost on my hijacked fuel gauge (I love the stealth gauge mode and the indication that I have reached 160F on my oil temp - thanks BMS :-).

After several WOT pulls to let the autotune settle in, I went to a deserted backroad to try a couple of 0-60 runs. First one, I decided to disable all traction control. Wow, that didn't work with a brake boost WOT start... Much wheel spin. Left traction control off and tried again by feeding throttle slower. That was better. It became quite clear that with stock runflats and this much wheel HP available that launches from a stop will take plenty of practice. I can think of worse things to work on.

From what I can tell, if you go to too high of an E85 blend, the fuel system can't keep up resulting in too lean AFM's. Is this correct? Does the DME or JB4 correct for this or am I risking running too lean (and too hot)?

I want to have fun (every once in a while) w/o asking for (too much) trouble.

By the way, E85 is no bargain since it was only 10% cheaper than 91, but only provides 66% of the enrgy content of gas.
JB4 G5 ISO|DCI|MSport|Premium|Cold Weather|6AT|Nav|Paddles|Comfort Access|PDC
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      11-29-2012, 03:56 PM   #2
Redrkt503's Avatar

Drives: E92 335is
Join Date: Jan 2012
Location: Ft. Lauderdale, FL

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A lot of people are running up to 50% e85, I for one being one of them. It seems to be different from car to car but do some logs and check out injector duty cycle and your hpfp an see what's up, if you aren't throwing codes or anything you should be fine at 38%...now go have fun!
2011 335is "Redrkt" 6 MT
DocRace 6266 Single Turbo - Fuel it stage 3 LPFP - Fuel it PI - spec stage 3+ clutch - mfactory SM flywheel - 100% E85 - VRSF 7.5" intercooler - VRSF charge pipe w/ HKS BOV - JB4 - MHD back end flash
768 whp 695 ft lbs - E85 - 32PSI
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