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Terry @ BMS Terry @ BMS is offline
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Posts: 25,615
Join Date: Jan 2008
Default 04-28-2018, 01:14 PM

Quote:
Originally Posted by Snowman
In that case it is very interesting that this user experienced his trims to fall from 30-35
http://www.n54tech.com/forums/showpo...&postcount=598

To 5-10 WOT
http://www.n54tech.com/forums/showpo...&postcount=596

First link is before BEF and second after/with your race BEF.
It even shows signs of running "lean" when trims are hitting 10-11.
So if what you wrote is correct there must be an issue with the BEF you are providing..
Sounds like you're just confused. Obviously with the BEF we adjust the fuel trims and AFR targets. Logs in the link look as mapped.

If your trims are sticking at 50 or 0 then may want to make an adjustment. If not then AFR targets are as mapped within the BEF. Is there a link to your specific log with the "problem" you want me to look at?

If your question is why do we run the N55 motors so lean it's because the fuel pump is weak and can't maintain pressure well at richer targets, and due to DI the motor tends to run better leaner, in our years of experience tuning it.


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