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Terry @ BMS Terry @ BMS is offline
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Join Date: Jan 2008
Default 08-19-2019, 06:12 PM

Originally Posted by LessIsMore
Mixed around 20% e85 into tank and logged map 3. Log attached. Temps were 88*F.

Trims look like they are maxxing at 44? Should I be concerned?
How does AFR look? Im not sure whats a healthy AFR to run on these cars.
Does the w205 JB4 have an AFR safety feature like the N54 does, if so what is threshold?

Want to be sure this log looks good before trying map 4 or higher E85 pct. mix.

Side note, Im impressed with how well the oem ATW intercoolers work! Just a few degree rise from 36- 86 mph on 88*F temps is great, even if it does start 30* over ambient.
You'll find the stronger the E85 mix and the higher the boost the higher trims go, and when they max out you could see the AFR start to lean out so keep an eye on it. A higher open loop will bring trims down but may also eventually throw low fuel pressure limp faults. You'll probably find map2 with E20-E30 and a 30 open loop setting the best reliable setting.

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