I've thought about wideband tuning and how many people say how fc's run rich. When you tune with a wideband, the o2 sensor goes in and the wideband monitor is used to tune. The dilemma is that, with the wideband in, there isn't a signal to our ecu, RIGHT? SO, in turn it makes the car run rich by defualt.

Did that make sense to people?

 

What? Wideband's sensors have nothing to do with your ecu.

 

My point is that the original O2 sensor is used by the ecu. So when you replace the normal one with the wideband, the ecu doesn't detect a signal and runs rich by default. So when you try to tune with say for example a SAFC, when you plug the o2 back in, wouldn't you run really lean?

 

On the dyno, you can place the wideband sensor in the tailpipe.. not as accurate, but good enough..
If you want to purchase a wideband to tune on the street, you simply leave your stock o2 alone and weld on a new o2 sensor bung into your downpipe and put the wideband sensor in there..

 

Right now, I'm talking about going to a shop and getting it tuned with a wideband. The wideband 02 sensor replaces the normal o2 sensor for tuning.

 

I thought this was the best and most accurate way to measure. (Unless you have cats, then you will need a bung before the cats)

The shop should weld a new bung for you, for the wideband. Most widebands go in the tailpipe. You should not remove your o2 as your car needs it.

 

No...
Egt goes in tailpipes, the wideband goes in the header. THere isn't a point of welding a bung becuse its not a permanent thing. The wideband is only for tuning and people don't buy them just to tune.

 

Haha. OK... then why did you ask. Wideband with egt in the tail?

If thats what you think then you have no answer to your problem.

People here, who want to tune there cars (without a standalone) or just to measuse A/F get a bung because they have to. (On the street or with cats)

 

the stock o2 sensor is only used for light throttle crusing. it doesn't do anything at idle or full throttle.

 

Ok thanks!
That explains it.

 

A wideband o2 is just used for monitoring. If you have a stock ecu and not using a piggyback there is no way to alter your afr. Now if you have say, an safc, you tune it according to the readings that the wideband gives you. Also having a wideband o2 is great for keeping an eye on things if you dont have anyway of tuning your car. Its great, if you know your afr you basically know howmuch you could push your engine.

 

NO. EGT goes in the header. The wideband goes preferably, far down the exaust away from the turbos heat. I've had mine in the 02bung.......then about two feet down the downpipe and as an experiment about a foot from the left rear muffler.

Some adjustment of the afr can be made on series four cars. At idle you can adjust the idle mixture with the variable resistor.

Or you can open your afm and adjust the location of the spring stop by a couple of teeth to effect the mixtue over the full range.

 

^What he said. Some people use one EGT per rotor before the turbo, and then the wide after the turbo, before the cats.

 

egt should go at the header collector (right near the turbo flange)

the wideband should go next to the oxygen sensor with a new bung welded in

Dave

 

AEM recommends that their wideband (which uses a standard Bosch sensor) should be mounted 36" from the exhaust port on engines with high temperature exhausts, and that's where mine is mounted.

The wideband does not communicate with the stock ECU. Many standalones can be tuned to closed loop with a wideband (as in, setting the target AFR different from the 14.7 of a narrowband), especially an AEM EMS and to a lesser extent the Megasquirt.

 

Some wideband monitors out there will have a seporate wire coming from the meter, which gets hooked to the narrow band O2 wire of the ECU.

It is reccomended you move the wideband sensor down the exhaust a little bit, I have heard to many time about them burning out when they are to close.

There is a point, it usually is a permanant device if you tune with it and want to monitor your AFR while driving. Im talking about the AEM or PLX devices that you can mount and see while driving.

I find I still can make my engine idle better when I have the variable resistor to L and remove more fuel with the SAFC, about -2 to -4. This is on my motor though.

 

i for one bought a wide band and permanently mounted it in my 7. it never gets taken out and is always on. i tune with a safc II. but than i hardly drive my car..LOL