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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > My jb4 map 1 e85 mix log



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      12-11-2012, 04:16 AM   #1
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My jb4 map 1 e85 mix log

I just recently started running a 60/40 93/e85 fuel mix and wanted some opinions on my graph before I move on to map5.
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A 3rd gear run
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A random run, I'm not sure the parameters...
So I'm basically looking for fuel trim approval before I move on to map 5. The car actually feels slower than it did on 93 only. I tried out map 5 with the new fuel mix recently and it shut down due to boost overage.
Thanks for any info! I'd be happy to make a few more logs if anyone needs to see certain parameters.
Chris
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      12-11-2012, 05:58 AM   #2
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you're maxing out fuel trims, what is your open loop set at? It may not be a good idea to run that high of an E85 mix during winter.
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      12-11-2012, 04:19 PM   #3
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That's what I was concerned about. I haven't adjusted the loop at all, so whatever jb4's default is.
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      12-12-2012, 06:44 PM   #4
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raise boost limit to 19psi
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      12-12-2012, 10:34 PM   #5
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wouldnt map 5 be better then map 1 since it autotune will correct any problems?
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      12-12-2012, 11:50 PM   #6
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Yea, ur trims are high: get bms flash or lower e85
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      12-13-2012, 04:32 AM   #7
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Quote:
Originally Posted by idrift4wd View Post
wouldnt map 5 be better then map 1 since it autotune will correct any problems?
From all that I've read, it's better to begin using e85 while in map 1 to make sure your fuel trims are running at a safe level (as it requires ~1.2x the quantity of e85 as it would e93 to "fuel the fire"). So, you do some logging and find out if you're injectors are nearing maximum duty cycle (which mine are), before switching to map 5 which would target a much higher boost lever (requiring more fuel) and eventually max out my injects which would cause a lean condition and potentially grenade the motor. I'm going to refill with 93 once my tank empties and try map 5 on 93 only. This may provide that small performance bump I'm looking for until my M3 arrives.
Chris
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