Hey Guys,

I need some help from the guru people here working with Tephra V7 8859 ROMS. I bought an evo 9 which has been converted to SD 4 Omnibar sensor 2.0L with a 6466 Precision Turbo. The car open throttle is a beast but cruising is a mess. The car AFR goes from 13 to completely lean on the highway cruising between 2-3k RPM. When I stop in a light the RPM's goes up and down and then stabilize. On idle the AFR is not stable at all but stay between 13-15. I have seem people with the same combination with a very stable AFR on idle. I have attached the data log from today's cruising and the ROM so you can advice me where the issue could be. I have seem many inconsistencies between what I have seen in the search and the merlins book. The threads start with one subject and ends in order things, so, I can't figure it out. I will log some LTFT Low data today to see how it looks like. I bought a AEM V2 which I'm used to tune but this OEM ECU's have caught my attention. Your advice will be really appreciated.

 

Looks like fueling/SD table needs some more work. ECU is pulling lots of fuel and has maxed out the mid trim, this would cause the bouncing AFRs and cruising and idle.