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How accurate is the datalogging A/F ratio?
Posted: Wed Nov 28, 2007 11:23 pm
by 1fastsedan
Since the Predator has been out for the HEMI, several people have said not to trust the A/F ratio that the Predator datalogging returns because it is a narrow-band sensor. I think we all know that a wide-band sensor is ideal, but is there a range (say +/- .3 or something) of deviation you found between the stock O2 sensors and wide-band sensors that you can tell us about that you found during your R&D.
Thanks.
RE: How accurate is the datalogging A/F ratio?
Posted: Thu Nov 29, 2007 1:53 pm
by mikel
No, the PID you see is commanded A/F ratio, and has no correlation to what the actual A/F ratio is.
Thanks
RE: How accurate is the datalogging A/F ratio?
Posted: Thu Nov 29, 2007 2:55 pm
by 1fastsedan
Can you explain "commanded A/F ratio" a bit more? I haven't heard this term before. Thanks.
Re: RE: How accurate is the datalogging A/F ratio?
Posted: Sat Dec 01, 2007 8:26 pm
by gsrt-8
1fastsedan wrote:Can you explain "commanded A/F ratio" a bit more? I haven't heard this term before. Thanks.
bump.
RE: Re: RE: How accurate is the datalogging A/F ratio?
Posted: Sat Dec 01, 2007 9:34 pm
by RFischer
What I get out of that definition is that HAL is asking the engine to mix 14 parts air to 1 part fuel at normal travel and about 12 parts air to 1 part fuel at WOT. This is what HAL the computer is asking for. What you actually achieve in reality could be different as best determined by a sensor ...
RE: Re: RE: How accurate is the datalogging A/F ratio?
Posted: Mon Dec 03, 2007 11:56 am
by mikel
Commanded means that is what the PCM is shooting for, to see what it 'really' is, you need a wideband.
Thanks