Refresh my memory,
Example ltft is 1.10 at 2v and i want to move it to 1.03 do i multiply the maf value by 1.07 or .93 to get it close. I feel like it would be 1.07 but i just want to make sure before i check my ltft and make changes after my fuel system upgrade.
Ltft
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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
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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: Ltft
Pretty sure i am backwards. I believe 1.10 means it's removing 10% so i would lower the maf value not increase it.
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PaulC-turbo5.0
- Posts: 104
- Joined: 2021 Feb 15, 21:56
- Location: Lancaster New York
- Vehicle Information: 1989 fox GT convertible
5.0 stock block, E7 heads, stock cam
Explorer GT40 intake flipped to driver side inlet
Single 67mm On3 BB turbo
Flipped JBA headers, custom SS 2.5" hotside built by me
custom 3" coldside thru On3 intercooler
tuning with Moates QH + TPRT
Dechipa's GUFX and supporting files, couldnt have tuned it myself without him!
Re: Ltft
You were right the first time multiply by 1.07. Above 1 means it’s adding fuel
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decipha
- Posts: 5031
- Joined: 2021 Feb 15, 12:23
- Location: Metairie, LA
- Vehicle Information: Work Truck
'19 F-150 3.3L
Re: Ltft
You failed to read the fuel write up.
KAMRF is the absolute fuel error% at that specific imaf count.
The KAMRF is a direct multiplier to maf flow at that specific imaf.
^^ word for word from the fuel write up
if at 2v your moving 10 lbs/min of air and kamrf is 1.10 then
10*1.1 == 11 lbs/min of air it needs to be to get the fuel error to 0.
If you increase it only by 10*1.07 = 10.7 lbs/min,
then 11/10.7 == 1.028 is your new fuel error.
Best to read over the fuel write up on the homepage.
KAMRF is the absolute fuel error% at that specific imaf count.
The KAMRF is a direct multiplier to maf flow at that specific imaf.
^^ word for word from the fuel write up
if at 2v your moving 10 lbs/min of air and kamrf is 1.10 then
10*1.1 == 11 lbs/min of air it needs to be to get the fuel error to 0.
If you increase it only by 10*1.07 = 10.7 lbs/min,
then 11/10.7 == 1.028 is your new fuel error.
Best to read over the fuel write up on the homepage.
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PaulC-turbo5.0
- Posts: 104
- Joined: 2021 Feb 15, 21:56
- Location: Lancaster New York
- Vehicle Information: 1989 fox GT convertible
5.0 stock block, E7 heads, stock cam
Explorer GT40 intake flipped to driver side inlet
Single 67mm On3 BB turbo
Flipped JBA headers, custom SS 2.5" hotside built by me
custom 3" coldside thru On3 intercooler
tuning with Moates QH + TPRT
Dechipa's GUFX and supporting files, couldnt have tuned it myself without him!
Re: Ltft
Do you not recommend targeting 1.03 anymore?
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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: Ltft
LOL, exactly what i was thinking. 1.028 is pretty damn close to 1.03 which I believe is the target. I also did reread the fuel write up last night but the problem is there is no write up regarding using the fuel error table that is populated when driving around and exactly how to correct based on the data in that table.
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decipha
- Posts: 5031
- Joined: 2021 Feb 15, 12:23
- Location: Metairie, LA
- Vehicle Information: Work Truck
'19 F-150 3.3L
Re: Ltft
I've never targeted 3% ??
I target 0 and dont allow negatives only positives up to 3% if its anymore than that then i apply the correction.
No write up needed as it just shows you the fuel error same as if you calculate it.
I target 0 and dont allow negatives only positives up to 3% if its anymore than that then i apply the correction.
No write up needed as it just shows you the fuel error same as if you calculate it.
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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: Ltft
Maybe i misunderstood but you used to recommend targeting the fuel error at 1.03 for ranges above idle and .97 to 1.03 (i believe)for idle ranges, so what changed? Are you saying I should just target 0 for the fuel error in all ranges now?
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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: Ltft
Sure wish i could go back and find old posts. Both Paul and I remember 1.03 as the target so I'm not sure how both of us somehow came up with the random number as the target. Whatever... I'll retune for 1.00