_Endless_

does any body here got any idea if what air/fuel ratio when an autometer a/f gauge is fully rich(last LED lit up) corresponds to, to a wide band? what if 4th green LED before the last green LED lit up what afr does this correspond to? any body compared them before?

i know they're not accurate for tuning but i'm just curious as to the comparison of the 2 with regards to the air/fuel ratio.

keebler65

its not much of a ratio thing because of how the operate differently. the curves are so sharp on either side of the stoic area for the NB's that its almost impossible to tell "how lean" or "how rich." think of a narrowband as three positions: lean, stoic, rich. i hope this makes sense.

ion_four

I would venture to say that no one knows. If it was a simple matter of conversion, no one would waste their money on a wideband. If you just hook up a voltmeter to your oxygen sensor and the voltage stays above 0.9v at high load, you should be fine. that corresponds to about 12-11:1, but is very inaccurate, because the scale is not anywhere close to linear at that point.

The last led is probably 1v, or very close to, since that is as high as an oxygen sensor puts out. So, you're probably somewhere between 12:1 and straight fuel

turb

i have a similar question..

what if you only have an autometer a/f gauge at the moment and you're boosting 7 psi on a b16 intercooled running the vafc hack with 450cc DSM injectors, will staying on the first few led's on the rich side of the meter be safe enough?

i'm currently using an autometer a/f gauge with an ntk o2 sensor from an eg civic. the o2 sensor is hooked up just right after the turbo (on the downpipe).

my settings on the vafc is 1-4k -42%, 5-7K -38% and 8-9k -35%. at full boost my a/f gauge reads rich, middle led's in the rich range. pulls hard and smooth.

is it true that autometer a/f gauges are only good on WOT?




Modified by turb at 7:06 AM 5/6/2003

_Endless_

one more question, would a narrow band digital read-out like those of SAFC blue wire mod be more accurate than the LEDs of the autometer? say if you hook up a 4-wire o2 sensor to a digital readout like in an safc and another 4-wire o2 sensor connected to an autometer a/f gauge, which one will be more accurate? or are they just the same?

dfoxengr

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ion_four &raquo;</TD></TR><TR><TD CLASS="quote">I would venture to say that no one knows. If it was a simple matter of conversion, no one would waste their money on a wideband. If you just hook up a voltmeter to your oxygen sensor and the voltage stays above 0.9v at high load, you should be fine. that corresponds to about 12-11:1, but is very inaccurate, because the scale is not anywhere close to linear at that point.

The last led is probably 1v, or very close to, since that is as high as an oxygen sensor puts out. So, you're probably somewhere between 12:1 and straight fuel </TD></TR></TABLE>
yes narrowband is crucially inacurate, i wouldnt trust autometer AF guages ither as their calibration blows as well..

93LSivic

When I ran that POS, the last red led actually meant 13.7:1. Yeah thats rich.....fuggin crapola.