VE numbers vs injector duty cycle

[nilsp]

I’m wondering how the logics between DC og VE numbers in the fuel table is.

 

Reason is I did change my exhaust header this winter, no other changes to the engine.

-except new wbo2 which now is via can.

 

It started running very rich, across all areas of the fuel table.

after adjusting it reasonable ok, on road and track the afr’s are quite good now.

Will go for adjusting and measurements in dynapack also soon.

But the strange thing -to me at last..

Is that the injector duty is actually a little higher at the max torque and hp areas, while fuel table is 15-20% lower.

 

Is this logical?

[MagicMike]

If you are using different wideband in a different location, anything is possible.

[Adamw]

13 hours ago, nilsp said:

But the strange thing -to me at last..

Is that the injector duty is actually a little higher at the max torque and hp areas, while fuel table is 15-20% lower.

 

Is this logical?

Would really need to see a log to find where the difference is coming from but assuming all other variables where equal then a lower VE number would result in a lower DC.  However there are so many variables that go in to the fuel model that it is unlikely they were all the same.  Most likely I would say MAP, Fuel pressure, RPM or charge temp.  As Magicmike says the calibration of the lambda measurement device will play a part too.