View Single Post
LessIsMore's Avatar
LessIsMore LessIsMore is offline
Inner Circle Member
Posts: 1,174
Join Date: Aug 2012
Car: 2009 535i Sport SAT
Default 08-19-2019, 06:49 PM

Originally Posted by Terry @ BMS
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.
Yes And is kind of why I honed in on that metric once I mixed in E85.

I am OK with playing with the tuning a little bit in order to get a good balance of power and reliability so would you recommend raising FOL to 40 and see if it brings down the trims while keeping the AFRs good?

Does the W205 JB4 have AFR safety measures like the N54 unit? If so what are those thresholds?

Thanks Terry.

2017 AMG C63 - JB4 - 11.69 @ 127 (dragy)
2009 BMW 535i - 548 whp - sold
Reply With Quote