fuel mixtures with O2 sensor

ive been reading up on using a multimeter and a good 02 sensor from a car to set up a proper air to fuel ratio.

looking further you can buy a gauge for 28 bucks and plug the sensor into it and it could make tuning very easy.

anyone try anything like this?

summet gauge

 

(where you want to be) is between 0.4-0.6 volts... 0.7 is running a bit rich (good actually)... 0.8+ is a bit rich (unless under WOT). below 0.3... hmmm...




thats the general idea im getting.


the o2 sensor only reads up to 1 volt. so from what im reading .40-.59 volts is in the range of the 14-1 mixture that you want?

im not so sure.

just thought id share and pick your brains.

 

http://www.scirocco.org/tech/misc/afgauge/af.html
been there done that, it was a good Mr. science experiment but not too practical.
i just used a volt meter and a tube up the exhaust pipe.
how can you tell what cylinder is lean/rich once they all mix?
where do you put a O2 sensor ?
O2 sensors have a heater in them that would put extra drain on the electrical system

 

Not all o2s have heaters and to do it right you need 4 sensors 1 in each exh. pipe

 

with the yics blocked isnt each pipe specific to each carb?

meaning. couldn't i do one at a time?

as to where to put it i hoped i could find one with a small enough sensor to fit in the test ports on the headers.

 

on the lower curve of your exhaust pipe there's a bolt that they say was used as a exhaust tap by the dealers back in the day. you could use that but how to adapt it to a O2 sensor that you can get today would be a trick. the bolt in your pipes is 6mm, a O2 sensor is 18mm, at least the ones i've seen are.
i used a external battery to heat mine because if their not hot enough, they give bad readings and i don't know how hot is hot enough or how hot it was.

 

The ports on the header were meant for using one of these beautiful doohickies



Good luck finding one used, and a new one will set you back about $3500.00

Buy a color tune. It's more than accurate enough for our purposes.

http://www.gunson.co.uk/tools.aspx?cat=673

 

gunson gas analyser


i have a colortune. i just think the whole blue thing is to broad.

id prefer a numerical result.



i guess dyno is the best way to assure yourself.

 

You'd spend over $200 to get a numerical readout? The colortune is like having a little spectrometer. It's more than accurate enough for the purpose.

 

no i wouldnt spend 200. but id want one.

 

I'm with you on that.

 

Yes but only until they get to the collector box and everything gets mixed up.

That's why Yamaha put the EGA ports on the bottom of each pipe just before it goes into the collector.

The ColorTune is our primitive visual substitute for an EGA.