Ultra rich as engine decels

Covers all sn94/95 mustang v8 ecu's.
dleach1407
Posts: 468
Joined: 2021 Mar 21, 15:17
Location: Colorado Springs, CO
Vehicle Information: 95 Mustang GT, CBAZA Quarterhorse
331, 190 11R heads, Edelbrock Victor 50 manifold, F303, T5, 76mm Turbo, 91 octane, Returnless dual pump 03 cobra tank, Behind bars rails, 80# siemens injectors
wbo2_030MtxL

57 F100, RZASA, 04 Crown Vic ecu and harness, 302, GT40 heads, 4r70w, 80# deka5 shorties, Holley carb style throttle body, Speedmaster high rise intake manifold

Re: Ultra rich as engine decels

Unread post by dleach1407 »

dleach1407 wrote: 2022 May 27, 14:12 Decipha, can I increase the MTEISF Xmul to get more resolution out of my transient table?
dleach1407 wrote: 2022 Apr 29, 22:31 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 wrote: 2022 Apr 24, 17:25 Can I please get some clarification on FN1052
dleach1407 wrote: 2022 May 10, 00:49 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.
Can I get an answer to these unanswered questions
dleach1407
Posts: 468
Joined: 2021 Mar 21, 15:17
Location: Colorado Springs, CO
Vehicle Information: 95 Mustang GT, CBAZA Quarterhorse
331, 190 11R heads, Edelbrock Victor 50 manifold, F303, T5, 76mm Turbo, 91 octane, Returnless dual pump 03 cobra tank, Behind bars rails, 80# siemens injectors
wbo2_030MtxL

57 F100, RZASA, 04 Crown Vic ecu and harness, 302, GT40 heads, 4r70w, 80# deka5 shorties, Holley carb style throttle body, Speedmaster high rise intake manifold

Re: Ultra rich as engine decels

Unread post by dleach1407 »

dleach1407 wrote: 2022 May 27, 14:12 Decipha, can I increase the MTEISF Xmul to get more resolution out of my transient table?
dleach1407 wrote: 2022 Apr 29, 22:31 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 wrote: 2022 Apr 24, 17:25 Can I please get some clarification on FN1052 (specifically how to dial it in)
dleach1407 wrote: 2022 May 10, 00:49 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.
Can I get an answer to these unanswered questions please
dleach1407
Posts: 468
Joined: 2021 Mar 21, 15:17
Location: Colorado Springs, CO
Vehicle Information: 95 Mustang GT, CBAZA Quarterhorse
331, 190 11R heads, Edelbrock Victor 50 manifold, F303, T5, 76mm Turbo, 91 octane, Returnless dual pump 03 cobra tank, Behind bars rails, 80# siemens injectors
wbo2_030MtxL

57 F100, RZASA, 04 Crown Vic ecu and harness, 302, GT40 heads, 4r70w, 80# deka5 shorties, Holley carb style throttle body, Speedmaster high rise intake manifold

Re: Ultra rich as engine decels

Unread post by dleach1407 »

Alright.... I finally figured out a method to get it dialed in, which is different than what was recommended. Instead of trying to stab the throttle and interpolate the values, I found a much easier way of dialing it in. I still have it locked in closed loop, still have dfso disabled ect. Here is what I did and it made huge differences.

When shifting, I would look at the load it was cruising at and then watch AFR when I let off the throttle. I would determine how far the fuel was off and then apply that change to the load/temp value in 1321. When cruising around 40% load and I shifted, I would see it drop to around .85 or so lambda so I would add 15% to the correct cell. After adjusting from 140 to 210 I applied the changes and drove it. Now when I shift I am seeing a small AFR change instead of a huge swing. Its still going a touch rich (.95 lambda) on decel so I have a little adjustment to perform but that method seems to be working better for me than the stab it method.

I think once I get tipout staying right around 1 lambda from cold to warm, then I can swing 312QD around to add or remove fuel on tip in to keep it a hair rich.
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