As you can tell from my subject, I got my Wideband O2 setup for self fine tuning of my supercharger setup.

My question is, which O2 bung should I put it in. There are like 4 from what I remember, 2 before the cats, 2 after the cats. I'd assume I'd want it before the cats for true A/F ratios, but do any of you tuners know if one side or the other runs leaner?

I doubt any comparison tests have been done on this, but I'm just hoping someone might have noticed something.

 

You should put in a new o2 bung before the cats. I dont know the implications of replacing a sock sensor with a wideband. That is what was done to the install the shop did.

 

I have a simulated narrowband output from my WBO2 setup so I can use that to wire into the stock O2 sensor connector.

 

Congrats Jesse........who makes it?.....and what was the damage($)?.......got any pics?

 

It's made by techedge, a company out of Australia. Total damage was around $390 US. The Wideband sensor was $38, so for around $430, I've got piece of mind in knowing exactly what A/F ratios my engine is seeing.

I'll also be able to log A/F ratios, up to 3 EGT temps, RPM, and 3 user programmable inputs (Boost, Oil Temp..etc etc) on my PC and have it displayed however I like and save the information to a Microsoft Access database I'm building.


The display looks like this... It has red LED's, but they autodim based on ambient light.




I'll have actual pics of my setup once I get it installed.

 

Once I get a full time PC and LCD screen installed in my car my display will look something like this

 

nice

its like your own rolling dyno....tune whenever you like

whats controlling fuel/ignition?

 

Man, now that will be sweet. Now all you need is a black car and Michael Knight........

 

[QUOTE]Originally posted by b18bvudoo
nice

its like your own rolling dyno....tune whenever you like

Yeah, I've got to have it for peace of mind. One of my main reasons is if I decide I want to drive to sea level. I can simply tune as needed without worrying about going lean.

Quote:

whats controlling fuel/ignition?

Ignition is still controlled by the ECU, but fuel is controlled by this. it increases fuel rail pressure as boost goes up.

 

You should nto replace either one - rather just weld another bung in

 

I've been seriously considering that. That way I don't have to worry about running new wires back down to the stock O2 connector. I guess that means I've got to find an O2 bung to put in it. Anyone have ideas as to where I can get one.

 

I had the shop that does my dyno's install one. They put it in the left cat, in front of the first stock sensor, near the headers. You could probably get one at any dyno shop.

 

Definitely add a new bung. The wideband reads different than the factory O2 sensor, so you can't just wire it in as a replacement. You shouldn't just uplug one of the O2 sensors either. Without both O2 sensors working correctly, the ECU will trip code. On an O2 sensor failure, it switched to a limp-home mode since it can't go into closed loop. Your car will then be running rich all the time and have the timing retarded way back down to kill the power. This is why you just don't touch the factory O2 sensors. There are one per bank because it actually looks at each bank separately. For the bung, you just need a hardened steel nut and it takes an exhaust shop less than 5 minutes to weld it on. It does need to be installed before the cat to read properly. I have an FJO installed in one of my other cars.

 

Anybody know how deeply O2 sensors protrude into the exhaust? I'm pretty sure I may be overthinking this but it just seems like the more sensors are in the exhaust stream, the more restriction they cause. Would there be an optimal arrangement of the two then, like one exactly ahead of the other so the second one is in essence "drafting"?

EDIT: Oh yeah, meant to congradulate you on the wideband sensor, jesseenglish. That unit sounds slick! I'm definitely one that desires more information and that unit looks like it delivers.

 

It doesn't protrude very much. Not enough to cause any real difference at least. I don't want mine to draft because I want to make sure they get a full sample of the exhaust stream.

When it's fully installed I'll do a complete review of the product. It has great potential, but I'm still waiting on the manufacturer to produce a final version of the logging software.

 

There is no restriction in the exhaust - NA cars need backpressure anyway, so don't think twice about it

 

Thanks for the reassurances. I knew I was going overboard with that thought