AFR Change day/night
09-25-2007, 02:15 AM
#1
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AFR Change day/night I just finished dialing in my afr for aprox 12.8. I noticed durring the day when its 90+ deg out that will be around 13 but at night it drops to 12.5. Is there anything that can be dont to keep this closer all the time? Im tuning with HPT
09-27-2007, 10:38 AM
#2
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Its due to temperature drift. Does you OS support an IAT/VE table. If so try populating it like this initially. Move the table around so that what ever temp you set your VE at is 1. Then instead of adjusting the VE because you know its set for one temperature adjust this table instead.
LABELS IAT VE Multiplier (Factor)
IAT °C {link: SAE.IAT} Value
-40 0.911377
-30 0.922607
-20 0.934082
-10 0.946289
0 0.958984
10 0.972168
20 0.985596
30 1.000000
40 1.014892
50 1.030517
60 1.046875
70 1.063965
80 1.081787
90 1.100830
100 1.120849
110 1.141846
120 1.164307
130 1.187988
140 1.213135
LABELS IAT VE Multiplier (Factor)
IAT °C {link: SAE.IAT} Value
-40 0.911377
-30 0.922607
-20 0.934082
-10 0.946289
0 0.958984
10 0.972168
20 0.985596
30 1.000000
40 1.014892
50 1.030517
60 1.046875
70 1.063965
80 1.081787
90 1.100830
100 1.120849
110 1.141846
120 1.164307
130 1.187988
140 1.213135