In reference to the $8D/730, when you start your car cold, does it use the VE table for fueling in open loop? I know there is a crank fueling parameter but that's only for starting right? Basically what I'm asking is if my VE tables are dead on 128 blm's, I don't have to worry about being rich on cold start in open loop right? The only thing to worry about would be too much or too little fuel for cranking right?

On a side note, wideband o2's are heated sensors right? How many seconds until it's at opertaing temp with a reliable output? For example, if it's 20 degrees F outside and I start the car, how long until I can trust the AFR it's reading? Also when warm, how many second would you guess until it's hot enough to be reliable again? Specifically I'm wondering about the Zeitronix Zt-2 unit...

Thanks!

Alex

 

There are a few tables that affect the (choke) cold start enrichment and open loop fueling. As far as the wideband o2 my Innovate is operational in about 10-15 seconds on a cold (40F) morning. Below are 3 open loop tables that come to mind. Should look at the hac (available on http://moates.net/fileman ) to see what else you may want to adjust.

; OPEN LOOP FUEL/AIR % CHG vs MAP
;
;
; TBL = PCT CHG * 2.56
;--------------------------------------------------

;--------------------------------------
L8420:
; %CHG MAP
FCB 5 ; 2 20
FCB 5 ; 2 25
FCB 5 ; 2 30
FCB 5 ; 2 35
FCB 5 ; 2 40
FCB 8 ; 3 45
FCB 10 ; 4 50
FCB 13 ; 5 55
FCB 18 ; 7 60
FCB 18 ; 7 65
FCB 23 ; 9 70
FCB 26 ; 10 75
FCB 31 ; 12 80
FCB 36 ; 14 85
FCB 36 ; 14 90
FCB 36 ; 14 95
FCB 36 ; 14 100
;--------------------------------------------------
;--------------------------------------------------
; START UP ENRICH vs COOLANT TEMP
; *** CHOKE ***

; TBL = 2.56 * %CHG
;--------------------------------------------------
ORG $0431 :

;----------------------------------
%CHG Deg c
L8431 FCB 243 ; 94.9 -40.0
L8432 FCB 192 ; 75.0 -28.0
L8433 FCB 154 ; 60.2 -16.0
L8434 FCB 154 ; 60.2 -4.0
L8435 FCB 128 ; 50.0 8.0
L8436 FCB 64 ; 25.0 20.0
L8437 FCB 64 ; 25.0 32.0
L8438 FCB 64 ; 25.0 44.0
L8439 FCB 49 ; 19.1 56.0
L843A FCB 38 ; 14.8 68.0
L843B FCB 38 ; 14.8 80.0
L843C FCB 13 ; 5.1 92.0
L843D FCB 13 ; 5.1 104.0
L843E FCB 13 ; 5.1 116.0
L843F FCB 2 ; 0.8 128.0
L8440 FCB 0 ; 0.0 140.0

OPEN LOOP AIR/FUEL PCT CHANGE vs COOLANT
;
; TBL = (PCT CHG * 2.56) * SCALAR
;--------------------------------------------------
ORG $045D ;
;
L845D: FCB 221 ; SCALAR,
; ARG = 256 - VALUE, (35d)
;

;----------------------------------
%CHG Deg c
L845E FCB 242 ; 94.5 -40
L845F FCB 153 ; 59.8 -28
L8460 FCB 76 ; 29.7 -16
L8461 FCB 50 ; 19.5 -4
L8462 FCB 38 ; 14.8 8
L8463 FCB 25 ; 9.8 20
L8464 FCB 25 ; 9.8 32
L8465 FCB 25 ; 9.8 44
L8466 FCB 25 ; 9.8 56
L8467 FCB 25 ; 9.8 68
L8468 FCB 25 ; 9.8 80
L8469 FCB 25 ; 9.8 92
L846A FCB 25 ; 9.8 104
L846B FCB 25 ; 9.8 116
L846C FCB 25 ; 9.8 128
L846D FCB 25 ; 9.8 140
L846E FCB 25 ; 9.8 152

 

Ok let me see if I understand this.

The way I read it though these choke tables only add fuel to richen the mix a certain percentage richer than 14.7 because when I first start I see the target AFR start rich and then go towards 14.7 as it warms up.

But still it's all based off the VE table values as to how much more to add though right?