Thread: Lean burn tuning

Originally Posted by GTPpower

From what I've discovered, changing commanded will change O2's so that 450mv=commanded.

And, I drive everywhere with a wideband.

The function of an 02 is to find stoich. 14.68. You can't alter the tune and alter what 450mv is. 450mv=14.68 on pure gas period. It's how the o2 works and not something you can change.

Originally Posted by GTPpower

You are saying that it can't be done, but, I've done it. I put on thousands of miles testing it, and the trims didn't correct it. From my experience, trims will usually correct an AFR within a few minutes after switching to CL.

If I'm understanding you correctly, you are saying that the commanded CL AFR has absolutely no bearing on what the car will actually run once trims are accounted for.

Thats exactly right, if its working for you then something else is wrong on your car. Either your wideband is off or your o2s are bad. If your narrowbands are still switching at 450mv and your wideband says its lean then it's your wideband. If you aren't switching at 450mv then it's your o2s. Care to post a log?

Originally Posted by GTPpower

From what I've discovered, changing commanded will change O2's so that 450mv=commanded.

And, I drive everywhere with a wideband.

nope. If you set it to 10:1, its going to still (try) to show 14.7 on the wideband no matter what fuel you have in it.