Help with logs and M300

[93jdmlaser]

I been using my logger like I always did and no I have the wideband wired into the egrt. When I log it under normal conditions it is fairly close to what the display says on the logger. I know about the high impedence so its not 100% accurate but I been trying to log when Im at full throttle and it always comes back like 8.6-8.9 afr. At first I thought it was right because the m300 display said rich air. So I leaned it out and on the last log I took the wideband never went to rich air. Still read display was in the 10s but yet the log is still saying high 8 afr. I am also getting counts of knock which are probably from running rich i guess. I think i mite have a boost leak from a crappy coupler. Anyone else having problems with logging their m300 with mmcd on a palm. Thanks

 

[GVR4592]

I would check for boost leaks first. Anything that the logger shows for a/f is not accurate, if you have a display for you M300 then go by that. The PLX can't even read below 10:1 so the logger is way off. Pre-O2 exhaust leaks can mess the readings up as well.

 

[93jdmlaser]

Found a nice big boost leak and the coupler at my tb elbow. Had a rip in it and boost gauge in the car wouldnt go up cause the air was coming out so fast. Also found one of the o2 housing bolts came loose so tightened that up. Hopefully when all the boost leaks are gone finally get this thing tuned. Thanks for the help