Best o2 sensor for tuning or is stock okay.

**SSJoe15** · 12-12-2005, 03:04 PM

Hello, I plan on buying HP soon and i am getting an A/F Ratio meter. finally the Questions.

1. Do i need a better or different o2 sensor for better tuning?
2. Do i need a better or dirrerent o2 sensor for the A/F Meter (or does it matter)?

so you say i need a diff o2 sensor...

3. What is a good sensor to buy?
4. I assume that i need to replace Both of them Yes/No?
5. Can the new sensors use the existing wiring?

I apologize if this has already been posted but i cannot find it.

Thanks in advance, joe

**foff667** · 12-13-2005, 04:48 AM

narrowband=inaccurate at WOT
wideband=accurate at WOT

if you get the EIO get the LC1 by innovate motorsports...it'll set you back $199

if you dont get the EIO get the LM1 by innovate motorsports...it'll set you back $349

either way your gonna spend the same amount but at least with the EIO option you'll be able to log the W/B directly into the scanner

**SSJoe15** · 12-13-2005, 08:08 AM

Thanks for the info

**hammertime** · 12-13-2005, 01:39 PM

Originally Posted by SSJoe15

so you say i need a diff o2 sensor...

FYI - Unless I'm mistaken, you will leave the factory O2 sensor in place and weld a bung into the exhaust for the aftermarket wideband O2 sensor you'll be using. The factory sensor is very accurate at 14.7:1 ratio, but falls off rapidly outside a small range. The PCM is calibrated to read the sensor cycling back and forth over that range. A wideband sensor more accuratley reads a broad range of A/F ratios that is fed directly into a data logger for comparative analysis.

Hope that makes sense!

**SSJoe15** · 12-13-2005, 02:17 PM

What is the ratio?

**foff667** · 12-15-2005, 08:19 AM

how many parts of air to fuel

**SSJoe15** · 12-15-2005, 09:17 PM

chrisj6 · 12-22-2005, 08:00 PM

sampling rate is also a factor. WB can be up to instant but most set it to 1/12, and NB is set to 1/6. So even at 14.7:1 your much better off with a WB.

Chris

**jimmyblue** · 12-23-2005, 10:56 AM

Narrowbands output continuous current /
voltage and they're sampled at the PCM rate
of 12.5mS (but loggers only pull at 5, 10, 20
frames per sec). The wideband sampling rate
is an artifact of the controller design. My LM-1
is 12/sec. Other units could use a different
timebase. Wideband controllers often smooth
/ average the data (LM-1 allows you to set
this higher or lower; too much smoothing will
make the reported AFR lag actual events).

The cheapest place I found for the LM-1 was
turbometrics.com, slightly less than other
places (including Innovate direct). I don't
know if they are still the cheapest, or even
still selling it, but worth a look. The exhaust
bung and plug you can get there, or from Jeg's
etc. I recommend not using the Allen head
plugs, I had a guy come down for tuning
once and we could not get them out (frozen
in, no leverage on the Allen key). An 18mm
Toyota oil pan drain plug (AutoZone) is an
uglier, but much easier to grunt loose, way
to go if you are going to leave it sit & sieze
up for long periods.