Ultra rich as engine decels

[dleach1407]

Page 6, 4 posts down. The one that says adjusted_cold in the name is the one I'm using, along with a short log file is attached there.

[dleach1407]

If I remember correctly, I set the decel time to 0 up to 90 degrees last time I drove it and the injectors do not shut off, instead it goes to about .89 lambda after a shift. I have the intake off of it at the moment building a new set of valve covers that I can use a PCV and vent with.

[dleach1407]

bump

[red5.0fogger]

I forgot, Are you super sure the injectors a legit, not fakes? They make fake everything these days. Yikes!
I wonder if you can use dashpot to hold some rpm in between shifts. May help somehow?

[dleach1407]

I bought them from PAS so i am fairly confident they are legit. I also found a website that shows the difference and mine seem legit based on that as well. The only real problem i have is the transient fueling when cold. Dashpot needs a little work but it's pretty close. I don't think it's the injectors when i can see in the logs the injectors go to 0 pw.

[red5.0fogger]

so it's reading super rich but pw is 0ms at that time? If it's dumping fuel on decel I would think it would load up and feel flooded and need to "clear out" once back on cruising throttle. Is that the case?

[dleach1407]

No, the title is misleading. If you read through this whole thread, I changed the transient settings from T4M0 to J4J1 based on what Decipha said. AFter I made that change, now it shuts the injectors off on decel during transient decel time. This happens 120 and below. After it warms up, it doesnt do it. If i set the decel time to 0 below 120, it goes rich on decel. This is why i suspect transient fueling as the culprit. As soon as I shift and press the gas, the AFR recovers and jumps right back to where it should be. There isnt much room to increase transient fueling in the cold areas becuase the cells are almost at max value by default but ive maxed them out, no change. Ive reduced them by like 30% no change. The only thing i have found that affects it is the decel time and if there is any decel time, it shuts off the injectors. Even at .1 seconds of decel time, it shuts off the injectors. This is why I keep asking to have my tune gone through but Decipha apparently doesnt have time.

[dleach1407]

Decipha, can I increase the MTEISF Xmul to get more resolution out of my transient table? Since I cant increase the table much in the cold areas, I figured that would help to give me the adjustments I need in the cold areas. I assume ill have to modify the rest of the table too but im really worried about the cold issues at this point. Ill have the car back together tonight and want to get back on trying to figure this out.

[dleach1407]

I ended up going back to the default T4M0 settings and started dialing it in today. I got it pretty close at hot already and no major lean/rich spikes on tip in or tip out when hot. Im gonna work on the cold settings a little more and see where it lies.

[dleach1407]

Oh yeah. Almost forgot, the shutting off of the injectors when cold issue is gone when i go back to the t4m0 transient settings. Now it's going rich on tip out, lean on tip in so i need to add some more in the cold ranges.