Long Term fuel Trims..

[waterbug1999]

I know that -5% to 0% is ideal.. Is this only under a load, idle, hwy speed, etc?

Im going to pay for some dyno time to hit all the cells for the mainVE table, just wanting to see how close I can get the LTFT's to 0 before hand as thats whay im suppose to do right?

[mr.prick]

When commanded is stoich. {B3601}
If LTFTs are greater than 0% when PE kicks in,
AFR will most likely be richer than you want and they will stay positive.
When PE is on LTFTs should be 0%.

[waterbug1999]

When I am cruising, its -.8 & -6.. When I let off the gas, they go to -12 & -12. Is that ok or what steps should I try to get them better?

Ive always had a problem with the cars RPM dropping (and sometimes dieing) after I let off the gas rather it be at a stop light or after a burnout at the drag strip. IT will find its idle but it takes a ~6 secounds if it didnt die.

[mr.prick]

See the link at the bottom of my sig.

[waterbug1999]

See the link at the bottom of my sig.

Ive been trying to understand it, but its tough to go step by step... Where are you making the PHP CODEs at in EFILive? I sat here yesterday with my scan tool open trying and I cant find anything close like that you got.


Create CALC.PID

PHP Code:
#Units Low High Fmt Expression
#------------ ------ ------ ---- ---------------------------------------------------------------------------
*CLC-00-010
factor 0.0 1.4 0.2 "({SAE.LONGFT1}+{SAE.LONGFT2})/2/100+1"

#Code PRN SLOT Units System Description
#---------------- ---- ------------ --------- ---------- -------------
CALC.LTFTBEN F010 CLC-00-010 factor O2-Wide "LTFT BEN"



Where do you set up / make this?






1. Set up Closed Loop Speed Density (no DFCO)
What map # is NO DFCO so I wont ask "is this right"?

2. Set the O2 switch point {B4105} to 450.0mV
I understand.

3. DO NOT DISABLE PE
Dont know how you would do that.


Log PIDs (minimum)
CALC.LTFTBEN
GM.AFR
GM.DYNCYLAIR_DMA
GM.KR
SAE.ECT
SAE.IAT
SAE.LONGFT1
SAE.LONGFT2
SAE.MAP
SAE.RPM
SAE.SPARKADV
SAE.TP
Add relevant WBO2 PIDs


I can select PID's, good to go there.



Filter out:
SAE.TP.% changing more than 5% 100ms OR
GM.AFR.:1 is less than {B3601}

Paste LTFTBEN to {B0101}

Dont you need to make some map/bens like I did in the autoVE part for this filter?


Enable the edit mask and shield the cells changed by LTFTBEN

I dont understand what this means or where edit maks/shiled are?


Then for WOT/PE mode filter out:
SAE.TP.% changing more than 5% 100ms OR
GM.AFR.:1 is greater than 14.62 or just under {B3601} OR
CALC.LTFTBEN is not equal to 1.00
Paste BEN to {B0101}


Dont you need to make some map/bens like I did in the autoVE part for this filter?


Reflash and retset LTFTs.

I can do this.


Notes:
1. Tuning with LTFTs will take a little more time because a higher cell count
is need for the PCM to learn LTFTs.

O.k...


2. LTFTs between 0% and -5% are the target but 0% to -3% is obtainable.

O.k..



3. Don't alter cells where average LTFTs* are between 0% to -3%.

Im assuming this applies in the maps after data logging.



4. You want LTFTs to be 0% or negative before entering PE.

What exactly is PE so so Ill know not to put a 0 in.

[mr.prick]

Where do you set up / make this?

The calc.pids.txt is located in
C:\Documents and Settings\Administrator\My Documents\EFILive\V7.5\User Configuration

Dont you need to make some map/bens like I did in the autoVE part for this filter?

Yes, use the LTFTBEN PID for data and the row and column will be MAP and RPM.

I dont understand what this means or where edit maks/shiled are?

The edit mask is not mandatory but it makes things easier, it keeps selected cells from being altered until you turn it off or deselect cells you want to edit.
i.e. you won't be able to paste over the cells that don't need to be changed, also you could just copy with labels and paste with labels manually.
See this post for the location of the edit mask icon.

Dont you need to make some map/bens like I did in the autoVE part for this filter?

I'm not sure what you mean by this but you don't need a separate map for a different filter, just make another filter and toggle between your filter with the filter properties.

Don't alter cells where average LTFTs* are between 0% to -3%.

Once you make enough adjustments, LTFTs will be consistent and you won't need to
alter them, 0% to -5% is fine.

What exactly is PE so so Ill know not to put a 0 in.

PE = Power Enrichment {B3618} & {B3616}
Commanded AFR will be lower than stoich {B3601} when PE is on.
If LTFTs are positive when PE comes on you will most likely be overly rich.
The WOT/PE filter will exclude positive LTFTs during PE so you wont need to worry about that.

Her's the calc.pid.txt with LTFT average and the LTFTBEN PIDs,
compare it to your calc.pids.txt to see how to format it or just use it if you don't have any calc.pids.
calc_pids(LTFT).txt
Do all this in Closed Loop Speed Density (can be used w/MAF as well),
see the tutorial for how to set CLSD up.

[waterbug1999]

The calc.pids.txt is located in
C:\Documents and Settings\Administrator\My Documents\EFILive\V7.5\User Configuration

Oh I see, I just copy and pasted it... And I see the CALC.PID text file but I dont see the Average LTFT PID text file?

Yes, use the LTFTBEN PID for data and the row and column will be MAP and RPM.

Since "A" & "B" are used for the VE Table, can I just use the next letter? Also, I see it has bank 1 and bank 2? Doest it matter?

[mr.prick]

Oh I see, I just copy and pasted it... And I see the CALC.PID text file but I dont see the Average LTFT PID text file?

They are both on the .txt

Since "A" & "B" are used for the VE Table, can I just use the next letter? Also, I see it has bank 1 and bank 2? Doest it matter?

Both PIDs are for bank1 & bank2 average.
The LTFT Average PID is for reference for using the edit mask,
you will multiply with LTFTBEN.
The PCM uses the average for both banks, no need for a map for each bank.
I fill A-J with maps myself.

[waterbug1999]

They are both on the .txt

Alls I have is the CALC_PID. (see attachment)


Both PIDs are for bank1 & bank2 average.

What I meant was when setting up the map properties.. I go to data and I have LTFT bank 1(%) and LTFT bank 2 (%).. Which ones do I choose? (see the 2nd attachment)

[mr.prick]

You choose one of the LTFT PIDs,
they both need SAE.LONGFT1 & SAE.LONGFT2 to be selected.
In the map data tab choose CALC.LTFT or CALC.LTFTBEN.
{B0101} Main VE Table - LTFT_maps.zip