Haltech NSP auto V.E. air temp compensation

I noticed that with the auto VE air temp compensation active i was getting some pretty erratic readings from my wideband o2 over the range of IAT temps. anywhere from -5% to +5% deviation from 1 lambda. when switching to a manual table, like the one discussed in the tuning fundamentals course, setting the table axis to throttle position and IAT it seems to provide more stable fuel output through the range of IAT readings. i am curious if there may be something setup incorrectly with the coolant temp bias table that is swaying the auto VE air temp correction or when i use calculated air temperature. attached are some snips of the tables i am referencing.

Do you still have air temp correction table still enabled when you turn on auto V.E air temp?

If so, turn off the air temp correction table and turn Auto V.E on then see if it settles. IF both are on, they likely are apply on top of each other which would explain why you are getting variances in lambda

When I enable the auto VE air temp correction I make sure the air temp correction table is disabled, otherwise it doubles up on the correction values. I noticed that the air temp correction table normally populates with calculated air temp as one of the axis, and I found that changing that axis to intake air temp helps my 02 readings stabilize. The location of my iat sensor is after the throttle body central to the intake manifold and I’m curious if this is something to consider when using the coolant temp bias table. Perhaps my iat sensor is reading more true temperature to what is actually entering the cylinders and the coolant bias table should be adjusted or ignored altogether.

My guess is that the reason for the fluctuations is Haltech Auto VE correction is assuming your intake air temp sensor should be located in the intake track just before the throttle body and after the intercooler if you have one. Not in the intake manifold.

This produces maybe not super precise, but very stable and reliable readings across a broad range of operating temps and conditions.

If you mount it in the intake manifold, the sensor can get head soaked really easily, and produce weird results that the Haltechs auto VE isn't designed to cope with.

This is probably why turning off auto temp, and using the air temp and coolant temp corrections is providing you better results as its helping to compensate for the heat soak.

https://www.hpacademy.com/forum/general-tuning-discussion/show/intake-air-temp-sensor-best-location/