Oxygen sensor for carb. tuning

After searching I found one guy that suggested this but with no reply. What if you screwed in an heated oxygen sensor into the exhaust of one cylinder. Using a mv meter a reading of .45 volts should be 14.7:1 . Or take reading from a carb. tuned to you're liking and match to it. Cars and newer motorcycles do it everyday why can't we ? Some good info here: klr650 page

 

I've pondered that idea a while back. One problem is that there's not a good place to mount the sensor without making new holes in the exhaust. The EGA ports are usually too corroded, and are too small anyways... and the O2 sensor's head has to be in direct path of the exhaust stream.

The colortune does a pretty decent job as a mixture monitor, though.

 

sounds like one a dem der teknolageez.... why would anyone want a better idea of what their engine is donig? carbs are great. all ya do is turn a screw or change the diameter of a hole and it puts more gas in. what's more precise than that?! In fact, i hate the way my FI car starts up with one crank every time and idles like a swiss watch no matter the altitude or temperature or watever.


all jokin around aside, its a freakin great idea. collecter seems like the right place to go and my druthers would include one of those LED AF ratio meters next to the gauges. The ultimate setup would be one on each pipe.

Forced induction guys love having this to let them know if their engines EVER lean out at any given RPM. Plug chopping and colortuning really only give you an idea of one specific RPM range.

 

Funny you should reply Stereomind, you had the only post that had the same idea. I was thinking of something like this for a sensor. Or use a short piece of exhaust pipe inline with each of the pipes.

 

http://www.scirocco.org/tech/misc/afgauge/af.html
i found this a while ago
you could use the original holes in the headpipes to fasten a section of pipe big enough to put a heated sensor in, if it wasn't sealed exhaust would flow through it and get measured but i think it would be very slow reacting because it wouldn't have much flow

 

This would seem to be a good idea. However, unless you're going to spend200-500 dollars to get a wide-band setup...it's horribly inaccurate. For precise tuning something like innovative LC-1 is required(300) plus laptop. I would say just use the standard colortune.

 

Yes , that would be good. You could make a set of four and have them all read as you are riding through all rpm ranges. I would make the center green and yellow then red going awa from desired setting. I will have to try this one. Thanks

 

all i wanted to do is set the idle mixture with a external battery for power and a meter to read the voltage
with a stock setup the jets and needle are right, yamaha did that part
if someone does pods and pipes, then the whole rpm range would be needed

 

Just rent a Van or a Pick-up Truck and drive over to your local Yamaha Dealership and tell them you are there to pick-up the EGA Machine and haul it away for them.

You might get lucky and have someone wheel-out the thing and offer to load it on to the truck for you.

You'll be doing them a favor!

(If you find one to haul away. I know the Dealership near me has one. It don't work right; and hasn't since Day-1. Hence, it rests. Pushed into a far corner of the Shop where it has collected 20-Odd years of dust and exhaust fumes. A relic of the past.)

 

This should provide ample reading material

ducati forum

 

narrow band is not as accurate, but for the money i think it will work EXCELLENT. for those who want to try it, here is a helpful chart.

a lot of MX racers will buy an extra header and put an o2 sensor in it to tune the carb or efi.

 

OK...well if you really want to use O2 sensor. There is no need to drill into your exhaust as stated earlier. Build a sniffer of sorts to pick up from the tail pipe. Simple and easy.

 

except by then all four cylinders are mixed
there is a hole already there, down by the collector that the dealers used back in the day

 

also the o2 sensors only work when they are HOT. the mufflers are way too cold to get any type of accuracy.

 

a lot of modern O2 sensors have their own heater built in (the four-wire kind). but yeah, reading the tail pipe will not give you much info.