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What AFR stability to expect at idle
Posted: Mon May 19, 2014 6:56 pm
by fordfanboi
I have a fairly healthy cam and lift on the motor so I'm wondering if this idle AFR is to be expected. It will float a point every second or so after it's warmed up. Should I expect a tighter range than that? EGO control has 10% and is active above 500 RPM so I'd think it could be much more stable than this... but maybe it's as good as I can get with this cam? Anyone have something as radical with a tighter idle? Here's the link to the vid - jumped ahead to the AFR at idle.
http://youtu.be/UqR5pEuJOjE?t=22s
Thanks for any helps!
Re: What AFR stability to expect at idle
Posted: Tue May 20, 2014 12:54 am
by trakkies
IMHO it's not usual to have EGO control enabled at idle.
Re: What AFR stability to expect at idle
Posted: Wed May 21, 2014 9:40 am
by fordfanboi
trakkies wrote:IMHO it's not usual to have EGO control enabled at idle.
The vid is with it enabled at idle. Is that fairly typical AFR? I see a 1 point spread at cruise too.
Re: What AFR stability to expect at idle
Posted: Wed May 21, 2014 2:22 pm
by DonTZ125
There was a discussion on that on ... some forum (sigh) ... not too long ago. From what I recall, you're seeing the limits of the WBO2 controller firmware. It COULD be made more precise (takes modified firmware from the controller manufacturer, so - not too likely), but a small 0.1 jitter is rarely an issue.
Re: What AFR stability to expect at idle
Posted: Wed May 21, 2014 2:26 pm
by fordfanboi
DonTZ125 wrote:There was a discussion on that on ... some forum (sigh) ... not too long ago. From what I recall, you're seeing the limits of the WBO2 controller firmware. It COULD be made more precise (takes modified firmware from the controller manufacturer, so - not too likely), but a small 0.1 jitter is rarely an issue.
TY!
Did you mean 1.0 jitter is rarely an issue? Mine will move from 13.0 to 14.0 in a second or two. My resolution is pretty much +/- 0.5 AFR.
Re: What AFR stability to expect at idle
Posted: Wed May 21, 2014 2:37 pm
by DonTZ125
Yuk! Yeah, a 1.0 jitter is not cool. Can you post up an .msq, data log, and some info on your build - engine, WBO2 controller, how it's wired - so we're not using the Magic 8-Ball Technique of Remote Troubleshooting?
Re: What AFR stability to expect at idle
Posted: Wed May 21, 2014 9:11 pm
by fordfanboi
I'll be cruising with the family this weekend, will make sure to log the trip and upload the info. TY for the help!
Re: What AFR stability to expect at idle
Posted: Wed May 28, 2014 9:17 pm
by fordfanboi
Fresh air calibrated the O2 sensor and it seems to stay around +/- 0.1 points at cruise now. Idle is still a bit more jumpy, but for the cam I'm using I think it's within tolerance.
Thanks for yer time looking into it tho!
Re: What AFR stability to expect at idle
Posted: Thu May 29, 2014 7:06 am
by DonTZ125
Glad it worked out for you!