I have been stumped with this for about 2 weeks now. Im sure the injectors are dialed in. They are modded 440cc wrx injectors to 740cc. First all my platform is a 2001 2.4l eclipse running sohc, 8:8-1 CR. 16g big wheel turbo, ported o2, 3 inch downpipe to an undercar dump. Also running an evo 8 Maf, the 3g maf is only calibrated up to 257 g/s. Changed the maf size to 357 for the evo maf. Did not change maf scale yet. All of this is in closed loop mode. idle is pretty much right on with fuel trims. and mid trim dumps fuel and sees lots of knock. This also is in a no boost situation. Light throttle at 15 to 20 in hg of vac. If I do get into 0 to 5 psi and it hits open loop then its dumping fuel and pegging the o2 sensor. I have attached my ecuflash rom as well as 2 data logs with all knock count seen in red.

The room is posted that I am currently using, and the secound zip is 2 data logs and the xml file to open the rom if you dont have it.

 

No ideas? I was looking at it today, I cant see how I am going to bring mid trims to close to zeros with making idle rich. The spread between the 2 is just to far

 

You can adjust MAF scaling to tweak the mid trims. If this is really your problem or not is the question. you mid trim MAF values are from ~75hz to ~500 hz. If you have not modified the MAF scaling table to reflect Hz, you can do it in your hear easily ... just divide the left column by 10 and that is the Hz value. 500 = 50 Hz.

Some people also claim that you can adjust mid trims via the injector latency table, but I'm not sure how that works. It's based on voltage, and I see ~14v at idle and cruise so I'd think adjusting that section would affect low and mid trims at the same time ... perhaps it simply affects one more than the other. I'm not sure.

 

I have tried tweaking the latency, but if I get mid trims in tune then is throws low trims way out. I thought about maf adjustment, but then that would look way out of wack, ,y 25,50 and 75 numbers would be way higher then mid maf calibrations and I have never seen I maf scale look like that. Its almost like saying my engine has terrible effieciency from 2500 and up. Checked for boost and vac leaks and I have none.