Looking for help answering a few questions regarding monitoring real-time AFR measurements. I understand our S197s come with Narrow-band O2 sensors, and I’ve read it is difficult for narrow-band sensors to accurately measure AFR (especially at WOT):

1) Can data-loggers (such as the MSD Dashhawk or SCT Livewire) measure AFR accurately, both in open-loop and closed-loop on narrow-band O2 sensors? I’ve read while in closed-loop, the AFR is almost always at or close to stoichiometric (14.7:1). However, in open-loop, narrow-band sensors cannot return an accurate AFR.. true?

2) Is it necessary to install a wide-band sensor to get accurate AFR readings (both in open and closed-loop modes) ?

3) Anyone with a MSD Dashhawk or SCT Livewire successfully pulling accurate AFR on the OEM narrow-band O2 sensors?

Thanks!

 

Haven't done the data-logging yet, but I did have a narrow-band gauge on my old vehical, all it was good for was a light show and telling me I was rich when spraying. My friend has a wide-band in his 500 hp turbo miata and it tells you exactly what your ratio is with no bouncing around (I know, a miata. This car is no joke I have seen it pull 3 lengths on a 11.5 sec LS1 Vette, he missed a gear took his time finding it and when he did the vette never pulled any ground)