Noob question on ve afr

[badgta]

Question.. Why would you not wish to use the Closed loop feature while cruising, part throttle etc?!? It would yield the best MPG...

Just curious is all.. Your reason i mean...

[steveo]

tuning the ve table with a wideband in open loop is by far the fastest way to achieve a correct ve table.

you can still use closed loop after tuning your ve table with a wideband

It would yield the best MPG...

that's rarely true. varying AFR across a load axis often produces the best fuel economy. factory cars can't really do that sometimes for emissions reasons though. depending on the engine i often tune 15.5-16:1 at light loads and taper down to 14.7:1-ish at medium loads. old cars can't do that in closed loop but newer cars with factory afr sensors sure can.

[badgta]

For getting in the "BALLPARK" sure.... But i mean, in the long run, once you are close.. Closed Loop is the way to go personally due to the ECM being able to compensate for varying conditions, etc.

Just my thoughts.. Especially if you have a upgraded ECM such as EBL etc.

You seems pretty knowledgeable.. Would love to converse with you on tuning sometime... Get some insights from ya.