Getting NB to read same as WB

[Gav]

Hi all,
LS1 T56 0411 LS1B running COS3
Have log headers with NBs in just before merge into GT45 Turbo.
I want to try to get my NB reading closer to my WB(in downpipe from turbo)
In B3647 i have set the target afr to 14.63 same as the table B3601 for 0 to 2000 rpm for up to 60 MAP kpa.
The wideband tends to read 14.2 to 14.4 when the commanded is 14.63
I wanted to use the NBs to correct fueling for heatsoak? or when i switch engine back on after a few minutes as the wideband tends to read up to 20 afr maxed until a mile or so unless i use this COS3 feature

Right i have tried altering (fudging) b3601 to 14.7 and 15.0 and set the B3647 areas to 14.7 or 15.0 but that doesnt seem to work as the commanded changes to something 14.79 when B3601 to 14.8 or 15.4 when i set B3601 to 15 so cant command higher stoich?

Following?? hehe

Putting stoich back to 14.63 and then tried setting all o2 switchpoints to 450 didnt work either in table b4105
Previous figures were roughly
0 345 345
8 420 420
16 450 450 etc

BTW how do i measure log which row i am in the table b4105?

Any ideas?
Have read similar threads but all seem to revert to not using the NB feedback in COS3 software?
Regards
Gavin

[joecar]

Hi Gavin,

Which wideband are you using?
Which AFR and BEN calc pids are you using?

What is on the axis of B4105?

[Gav]

Hi Joe,
NTK AFRM NGK

How do i know which air mode i am in?
0 to 64 ?
In B4107 it tells you which CL mode in but one of the axis is SAE.MAF and i dont have a MAf...?
Regards
Gavin

[joecar]

In your calc_pids.txt you have to do something like this:




# ================================================== ============================
# Add slot definitions here
# --------------------------------
# See sae_generic.txt for more information on "SLOT" formats
#
#Units Low High Fmt Expression
#------------ ------------- ------------- ---- --------------------------------------------------------------

*CLC-00-600
None 0 64 .0 "lookup({GM.DYNAIR}, 0,0, 4,4, 8,12, 12,30, 16,36, 20,40, 24,44, 28,50, 32,54, 36,64)"



but put your own DYNAIR values in the lookup pairs;

and then




# ================================================== ============================
*PRN - Parameter Reference Numbers
# --------------------------------
# See sae_generic.txt for more information on the *PRN section
#
#Code PRN SLOT Units System Description
#------------------------- ---- ------------ ---------------- ---------------- ------------------------------------------

CALC.CLMODE F600 CLC-00-600 None Loop "Closed Loop Mode"

[Gav]

Thanks Joe,
Will spend weekend trying to do it.
Regards
Gav

[joecar]

Let me know jow it goes