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 »

I appreciate you trying to answer my questions but Im not following what youre saying. I looked at the fuel writeup and didnt see anything mentioned about fn1321. FN1321 is not an SP** function so i dont see what scaling values have to do with it. Are you saying I need to multiply that table by my scaling percentage in order to get the table close after I copied it over from J4J1?
decipha
Posts: 4952
Joined: 2021 Feb 15, 12:23
Location: Metairie, LA
Vehicle Information: Work Truck
'19 F-150 3.3L

Re: Ultra rich as engine decels

Unread post by decipha »

in tunerpro any SP** value you see is multiplied by the scaling percentage to show the actual value. This is all due to the k-constant.

fn1321 is multiplied by the scaling percentage to get the actual value.
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 »

Is there any problem with me plugging in the J4J1 data like described on page 3? I didnt get time on Sunday to dial in the maf and the 1036 table but ill get those done pretty quick. If its not a problem, ill throw that data into the existing tune instead of waiting until the maf and 1036 are done. The transients are already way off. I dont think it can get worse LOL.
decipha
Posts: 4952
Joined: 2021 Feb 15, 12:23
Location: Metairie, LA
Vehicle Information: Work Truck
'19 F-150 3.3L

Re: Ultra rich as engine decels

Unread post by decipha »

nah go ahead
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 »

Thanks for all of your answers. I wanted to kind of get all of your thoughts into a quick and dirty flow sheet. Can you take a look at this and tell me if it looks correct

step 1 Ensure MAF/Injector data is dialed in

step 2 Dial in fn1036 using Histogram

step 3 Dial in Air_Man_Vol
a. Force closed loop at WOT or delay Open Loop (info is in the fuel write-up)
b. Stab throttle to try and get the initial hit at 1 Lambda (wait 30 seconds after changes applied)
Lean Hego = reduce air_man_vol
Rich Hego = increase air_man_vol

Step 4 Dial in FN1052
(Need Steps)

Step 5 Dial in Fn1321
a. stab throttle to a specific load and hold. Watch AFR
Multiply Load/ECT cell by fuel error (ex: Rich 10%, multiply by .90, Lean 10%, Multiply by 1.1)

Step 6 Dial in FN1322AL and FN1322DL
a. After tip in, if fuel goes lean after being consistent, increase Accel Time, decrease for rich
b. After Tip out, if fuel goes lean after being consistent, decrease Decel Time, increase for rich

Assuming all of the above looks correct, I have a question about step 5 part a.

Say I am idling and stab to say 60% perload and the fuel error is 30% (.70 lambda). Can I interpolate the fuel error for the other load points below 60%? That example would be a 5% decrease for 10% load, 10% decrease for 20% load, ect. Im sure that wont be perfect but it should probably get me closer than where it is now correct?

For tuning decel, would locking out DFSO be a good idea?
red5.0fogger
Posts: 148
Joined: 2021 Mar 22, 15:58
Location: Newington CT
Vehicle Information: 1986 Mustang GT, Stock block, TFS 170 Heads , N41 cam, ported cobra intake, nitrous, T5 , 3.73s

Re: Ultra rich as engine decels

Unread post by red5.0fogger »

How does cabaza strat know it's on decel? Closed throttle and high rpm, then it assumes decel right? Almost seems that dfso table could be backwards or have errors somehow. Turn off dfso and try it?
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 »

I tried disabling DFSO before I rebuilt my tune and I didnt notice much of a difference other than fuel not shutting off on longer decels. I am pretty confident the issue is with the transient fuel settings but thats also why i asked about disabling DFSO. I figured if DFSO is shut off, it would be easy to dial in decel
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 »

Well, i got the car out yesterday with the J4J1 transient settings in it. The transient fueling was still way off in regards to the amount of fuel its adding and pulling but the slowly drifting lean and misfiring after a shift when cold didn't happen. It still goes rich on decel and then lean after the shift, it just doesn't do the lean issue for 2-3 seconds. I did some data logs last night and ended up adding 30% fuel at 60% load and above from 0 to 90 degrees then at 210, I ended up adding 20% at 60% load. I interpolated the values below each load point and interpolated between 90 and 210 to get the corrections for those columns too then interpolated each column accordingly. I should be able to put some miles on it this weekend so fingers crossed, its better than it was.
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 »

Am i correct in assuming for fn1052, the left side is ect, the top is act? I believe I need to make slight modifications to this table. When I sent manifold volume to 3, its a little lean on tip in, when i set it to 2.75, its a little rich on tip in.
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 »

Was able to put some miles on the car today. The wideband sensor decided to take a crap on me Friday so I replace it today and did some driving. I think im going to replace it with an AEM. I seem to go through sensors really fast. Fuel is dialed in up to about 600ad counts and then is a little rich above that. I need to get out at night so I can do a couple pulls to get that dialed in. Im calling for .79 lambda and its showing .75 lambda so its really not that far off. 1036 is dialed in for the most part. Im not able to get in some cells so next time I have it on the dyno ill do some steady state pulls at different rpm and load levels to get that fully dialed in. Its dialed in in the cruising ranges. I think I have the transients at normal temps closer but still not there yet. Its still way off when cold so I will keep plugging away at it. Can I please get some clarification on FN1052
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