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Fuel trim and air temp compensation


Loki
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Hi,

I got near perfect fuel trimp whenever air temp is greater than 11C. However, the last few days when I got the car running when air temp is lower than 10C say 5-8C then fuel trim would be roughly around +3-5%. Where do we adjust fuel vs air temp compensation please?

Regards

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51 minutes ago, Loki said:

Hi,

I got near perfect fuel trimp whenever air temp is greater than 11C. However, the last few days when I got the car running when air temp is lower than 10C say 5-8C then fuel trim would be roughly around +3-5%. Where do we adjust fuel vs air temp compensation please?

Regards

When you say 5-8c are you talking about when the engine is cold or up to temperature? If the engine is still cold use the lost fuel tables, these are used when the valves and head are still cold/cool and not atomising the fuel as well.

image.thumb.png.330e6919305937b06f14d4aee11ae3e0.png

If the issue is when the car is warmed up and you experience a constant fuel trim error at all loads then you could adjust the aircharge VE temperature scalar. Beware this is a global scalar and will affect all loads including WOT.

image.png.6e406ad4de0657dbea1f8fbba277433d.png

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Just now, Loki said:

Thanks Roland. 5-8C as in driving in that ambient air temp: winter weather. Some day it will dip into 2C early in the morning

make a small adjustment to the cells in the aircharge VE multipler and see how you go with that. You could rescale it to fit your data as well.

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