B3647 help?

[2ktransam]

I am trying to Auto Ve my truck to work with speed density and I am having issues with my commanded AFR. I have B3647 set to run a little leaner at cruising levels and .78 lambda in for the upper end where I will start going into boost. The problem is I am always commanding 14.68 no matter how much throttle I give it. Why is B3647 not controlling my commanded AFR? I have attached the start of my tune.

[joecar]

2KTA,

Welcome...:cheers:

Try setting B4205 to 284F.

[5.7ute]

First up, do not autoVE a custom OS with stoich as your commanded AFR in any cells. This will invoke semi open loop mode which will cause the stft to adjust your fuelling.
To keep things simple command an AFR of around 14.5:1 in the unenriched(below 70kpa) sections of the map. Enrichen your high kpa cells to where you want them.
Restart your VE table from scratch & post the log file on here, then we will be able to help.

[joecar]

5.7ute/Mick has a very good point... commanding stoich in B3647 enables semi-open loop (SOL) which uses STFT's to trim to stoich.