Ultra rich as engine decels

[decipha]

yeah you cant do it while stationary you need to actually drive it and load the engine just as you would to dial in the maf or anything fuel related for that matter

i find its easiest to put her in a high gear so you can control it easier and not have rpms become a factor

[dleach1407]

That is exactly where my thinking was going too. Ill get it out this weekend and at least try to get the hot areas fully dialed in. The cold areas are really giving me hell. At and after tip in, I dont really get a rich swing but after tip out I get a serious lean swing. Im going to try and pull more fuel in those areas. The last adjustment helped a little so im hoping this next round will get it closer.

[dleach1407]

I think ive been looking at this wrong. Ive been more looking at what is happening when I am shifting and I think I need to shift my process to what I feel will probably give me better results which is being at a steady state, stabbing the throttle and making adjustments based on the load and AFR which is more like what you described above.

So lets say I'm cruising in 4th gear at 10-15% load at 210 degrees. I stab the throttle, I see the load jump to 60% and the load stays there for a few seconds. The wideband shows 12% rich (.88 lambda) after about 1 second stays there for a second or 2 and then tapers off. I would multiply the 60% load area (and above) by the .88 lambda. Can I interpolate the rows below? it seems it would be very hard to hit every load reliable. The interpolation example is below. Thoughts on this whole process?

@210 degrees

200 x.88
60 x.88
50 x.90
40 x.92
30 x.94
20 x.96
10 x.98
05 x.99

[dleach1407]

5-9-log.zip

Tune and log files

(143.57 KiB) Downloaded 232 times

Is there some sort of DFSO that happens during decel after a shift when cold? Im seeing 1.5 lambda when cold up to about 120 degrees. It doesnt matter what I do with transients. Ive reduced it as much as 15% and it still hits 1.5 lambda on decel. When its at the reduced setting, tip in transient when cold is pretty much perfect but it still ultra lean on decel. I returned the cold settings back to default thinking I am going the wrong way but all that changed was the tip in. With the default settings, i get rich tip in to about .85 lambda at about 60% load which tells me to reduce that cell by 15 percent and interpolate the below values. I have the maf curve dialed in to about 550AD counts, disabled DFSO, and delayed OL based on your recommendations. 1036 still needs a little work but its pretty close. Ive attached a short datalog of my cold drive over to the gas station with the default cold transient settings and you can clearly see it hit 1.52 lambda. I have attached 2 copies of my tune and the datalog for the default cold settings. The names of the tunes should describe the difference. I have no idea why this is happening.

Can someone take a look and see if they can determine why its lean after shifts? Can I please get clarification on how to dial in 1052, and can i get an answer about interpolating the cells in 1321 that I mentioned in earlier posts?

[dleach1407]

Could ITHBMA set to 0 be the cause of this? I keep reading posts talking about dialing in throttle body air mass and I know I havent dialed that in. Based on the idle write up, I dont think I need to mess with it.

[dleach1407]

I looked at the datalog last night really close on the .25 playback speed and I believe the issue may be with the decel time constant. It takes about 1 second from the time the throttle is closed to the time I start getting the ultra lean condition. I reduced my decel time constant to 1 second in those areas. I have yet to drive it with the changes. I should know more tonight.

[dleach1407]

Went out and drove it today and it still hits 1.5 lambda on decels between shifts when cold. I went as far as set the decel time constant to .1 and it still hit 1.5 when cold. Is this a case of it going into closed loop too soon maybe?

[dleach1407]

The datalog clearly shows the injectors are shutting off at decel. With the .1 decel time, I can see the injectors go to 0 pulsewidth for about the same time the decel time is set to. My datalog captures 7 cycles per second and its 2 cycle difference from 0pw back to seeing pulsewidth and about 4-5 cycles before the pulsewidth is above the ford recommended minpw. I just checked my tune and I can see that the MinPW is set to .099 which is way lower than the ford spread sheet of .599. I changed it to .599 but it changes to .401 after its saves so I guess Ill see what happens with that. I attached a couple screen shots showing the dashboard. I also don't understand how the pulsewidth drops below the min pw setting. I get 0.00 with a min pw of .099 so i don't feel like it's the problem and something else is shutting them off.

[dleach1407]

Bump.......

[dleach1407]

Bump