I am looking for a A/F Sensor for my 67' F-body. I have 3 webers and believe that this will help me jet and set up my motor. Does anyone here have any experience with any aftermarket A/F sensor's on carburetated motors? Most models I have found are 'narrowband' but one company in Canada sells a 'wideband' model http://www.fjoinc.com/automotive/WBO2details.htm#wbo2rpm The wideband is more $$ but in the end I think it is the smarter way to go. Any thoughts?

Thanks

Man, that link looks way $$$$ :eek: !!

I did some research and ended up using this guys setup: http://www.bob2000.com/carb.htm . Scroll down and look into his cheapo setup. The only thing I'd like to do different is to use a heated O2 sensor so I could get good data from startup, but those seem to be a lot more expensive! One that I want to try is the Bosch 13077 which is a simple 3-wire O2 sensor, but not the wide-band kind. If you are close on the tuning, I don't think you need the wide band one, but it would be nice to have. Also, I've heard some of the imports like Hondas and VW's use the wide-band ones from the factory... be prepared to spend some $$$$ on one tho!

Good luck,
Bill C.

Loks like a lot of cash. Once the carbs are in tune, the A/F meter really isn't needed. Are you planning on running your engine at a 15 to 20:1 ratio? If not, why do you need to be able to sense that range of ratios? If anything, you will be on the rich side with multiple carbs.

I think you would be fine with a narrow band meter. Just find a good one, preferably with a heated sensor.

Don't misunderstand the capabilities of a wideband sensor. The advantage is not that it can range up to free air, the advantage is that it can actually read 13:1, and all other ratios in a linear voltage output.

Normal O2 sensors cannot read 13:1. They can only read 14.7, that's it, nothing else. Anything else is inaccurate.

I made my own Wideband O2 controller, so I have had the experience of using a wideband sensor. Previously, with a normal, heated O2 sensor, I thought I had the ratio down pretty good at full throttle. When I installed my wideband, turns out I was running a 11.3:1 at full throttle, so I was able to immediately fix that with the wideband, now it runs a constant 13.2:1 at WOT.

In short, conventional O2 sensors are only good for idle and cruise, which still makes them useful. If you're going to the drags, a wideband is the key.

Thanks guys for your responses. Yes it is more $$ about $800 but I think in the long run it's the way to go. Like Silver69Camaro said, the cheaper narrowband are set up to read 14.7 and then tell you if you are over or under it.

I plan on Autocrossing my car again so it will be near full throttle most of the time in 2nd and 3rd gear.

Check this link out for a slightly cheaper alternative (once you convert from Aussie $).
http://www.techedge.com.au/vehicle/wbo2/default.htm

Wrager- Thanks so much for that link!! God I love the internet graemlins/beers.gif

Well the Tech Edge wideband is a lot cheaper after conversion to US dollars. Unless I missed something it's $315.US for the kit but NOT including the oxegyn sensor. Napa sells the O2 sensor for $140.

[ 04-10-2003, 07:19 PM: Message edited by: HOT OHC ]