what is the best air fuel meter around wide band type and where from

 

I don't know of other ones, but I can vouch for this:
http://wbo2.com/

It even has a good inbuilt datalogger and PC interface and still it's about the cheapest one out there, DIY or ready built.

 

If you want to pay real money for a real monitor, you want the one i use daily, but its not hobbyist money if thats what your after?

 

i want one that works ,to say its lean or rich ,that will no if it is runing lean ,better to be safe than sorry

 

If you only want to know you are running rich or lean why do you need a wideband sensor?
My display uses a normal lambda sensor and I find that adequite for simple checking to prevent an engine meltdown!

Thanks
Darren

 

A narrorband sensor will still say its rich whilst the top of your pistons are rattling around in the crankcase after meltdown, thats why They just dont have the capability to read mixture at WOT as they are designed for mixtures concentrated around 14.7:1 and are not accurate at all with very rich mixtures.

The one Jesse has linked to is a decent one, and ive tested it against my own £6K+ machine and its reasonably accurate

 

I agree that they will cope arround 14.7 (lambda 1), above and below is a bit subjective.
My point is that they give suffient detail to ensure that the engine is not running lean, I personally have had quite a good result from these sensors.
I find that they will give suffient detail to 13:1 a/f ratio which is fine for me.
I`m looking into making a wideband sensor controller, but personally believe that it is best to tune on a rolling road and use in car sensors as a backup mechanism rather than tuning.
Thanks
Darren

 

Morning,
They are a good 30% out by 13:1 on average, remember, i use these every day and see the reference output compared to my industry standard Labcell unit. Another thing that gives cause for concern is that these narrowband cheap units tend to read richer as they get hot, so as the engine leans, the EGT goes up and the sensor reads richer... not a great scenario....

Bottom Line: Dont trust it, the manufacturers dont, and nor should we.