Re: Idle richness with 7747.

["Kevin Reynolds" <kereyn@gte.net>]

 

>
> The idea is to get open BL as close to 128 as possible.  The accepted
> range from GM is 128+/-10, so your calibration is still too rich, even
> though the O2 is able to correct it.

 

It's better in the areas I've been playing with, just haven't found the right tables for the area I'm having the problem with.
>
> You realize that as far as the ECM is concerned, it is hitting
> 14.7:1.  Without the feedback from the O2 sensor, it just calculates
> fuel delivery based on the numbers in the prom.

 

That's what I'm figuring. Somewhere theres a table telling this thing to put in x amount of fuel so it cam be at y AFR. If I can find out where this setting is I can fudge the figures it thinks it's at so it's "realworld" AFR is where it's supposed to be.

So far I've only burned a couple chips checking this out, I just thought maybe someone knew of a table I was missing. I just started using the non-closed loop chip to help in my tuning and that's when the idle became more of a priority. What used to be just a rich condition until feed-back kicked in is now my full time idle condition since it never leaves open loop. It's funny, before I was just concentraiting on the non idle areas, and went to the open loop idea to help narrow that down faster. Now since doing that I'm more focused on the idle area.

Kevin R