Autometer Wideband O2 Gauge WOT Switch?

soontobefastfox · Oct 1, 2007

I was looking at the PDF file for the Autometer Wideband O2 gauges because I plan on installing one this winter. I have one question, where is the WOT switch on our mustangs?

vristang · Oct 1, 2007

There are several 'Strategies' the ecu uses to control fuel/timing.

Cold Start
Warm Start
Part Throttle
Wide Open Throttle

The ecu switches between these Strategies on its own. There is no manual switch per se.

Does that help, or make things clear as mud?
jason

HISSIN50 · Oct 1, 2007

Jason will be able to get your figured out (I'm not sure exactly what the goal is).

If you end up using a mechanical switch or soemthing within the EEC, as I recall (Jason can confirm) the A9* puters see WOT at about 2.71 volts over the baseline reading.

Good luck.

smr · Oct 30, 2007

Wide Band O2 meter require a wideband sensor..the factory setup measures multiple places (see above post) to accommodate the computer without use of wideband..wideband sensor is definitely a more fine tuning tool then the stock measures but overkill if you dont have performance mods...

soontobefastfox · Oct 30, 2007

vristang said:
There are several 'Strategies' the ecu uses to control fuel/timing.

Cold Start
Warm Start
Part Throttle
Wide Open Throttle

The ecu switches between these Strategies on its own. There is no manual switch per se.

Does that help, or make things clear as mud?
jason

I am not sure I quiet understand. The wideband O2 sensor needs a WOT switch so I can recall the wideband AFR.

I am starting to question if I need the wideband O2 sensor. I did not tune my stang myself (as of right now I do not plan on diving into tuning), but it was professionally tuned using a wideband O2 sensor and dyno. Would it be good for monitering or once its tuned the AFR should not change?

I believe I have the performance modifications that would require a wideband O2 though. 331 N/A HCI combo (361 rwhp, 370 rwtq), with a good compression ration of 10:1 so I add a supercharger down the road (small amount of boost nothing over 12 psi).

Sorry it took so long for me to reply, college is taking over my life....

Fox8950 · Oct 31, 2007

Don't the O2s get cut out at WOT? I know the MAF has the relay on the fenderwell under it that is a WOT cutout is there one for the o2s? Thought maybe thats what he means.

HISSIN50 · Oct 31, 2007

Fox8950 said:
Don't the O2s get cut out at WOT? I know the MAF has the relay on the fenderwell under it that is a WOT cutout is there one for the o2s? Thought maybe thats what he means.

The O2's never 'cut-out'. Their input is more relied-upon at some times than others however.

The WOT relay is for the AC. It has nothing to do with the MAF. The MAF is critical at WOT.

Fox8950 · Oct 31, 2007

Any chance any of you could point me to a good post explaining open loop, closed loop? apparently I need to reread things.

vristang · Oct 31, 2007

soontobefastfox said:
I am not sure I quiet understand. The wideband O2 sensor needs a WOT switch so I can recall the wideband AFR.

I am starting to question if I need the wideband O2 sensor. I did not tune my stang myself (as of right now I do not plan on diving into tuning), but it was professionally tuned using a wideband O2 sensor and dyno. Would it be good for monitering or once its tuned the AFR should not change?

I believe I have the performance modifications that would require a wideband O2 though. 331 N/A HCI combo (361 rwhp, 370 rwtq), with a good compression ration of 10:1 so I add a supercharger down the road (small amount of boost nothing over 12 psi).
....

If you don't have a tuner, then you may not need a WB...
You could hook up the WB to a digital gauge on the dash, but there is no need to run the WB signal to the ecu.

If you haven't changed anything on the car, then the tune should still be 'good'

Hope that makes more sense...

soontobefastfox said:
Sorry it took so long for me to reply, college is taking over my life....

No need to apologize... That is a VERY GOOD thing to stay focused on!

jason

vristang · Oct 31, 2007

Fox8950 said:
Any chance any of you could point me to a good post explaining open loop, closed loop? apparently I need to reread things.

Open Loop and Closed Loop refer to feedback control systems.

In this thread we have been discussing the O2 sensor feed back system.

In Closed Loop, the ecu commands a specific pulsewidth of the injectors then gets feedback on how much fuel was added from the O2's. The O2 sensors are the feedback part of the system.

In Open Loop the ecu commands a specific pulsewidth of the injectors, but the O2 sensor feedback signal is ignored.

In CL, the ecu will use the feedback from the O2's to refine the pulsewidth commands for the Injectors.
During OL, the ecu will ignore the O2's, and simply command the pulsewidth that is normally calculated for the Injectors.

The O2 signal is the only sensor input that is ignored during OL operation.

Not sure if that made any sense or not... hope so...
jason

Fox8950 · Nov 1, 2007

Yup sure did, thought one of those things got cut out in OL thank u much for clearing that up.

soontobefastfox · Nov 1, 2007

vristang said:
If you don't have a tuner, then you may not need a WB...
You could hook up the WB to a digital gauge on the dash, but there is no need to run the WB signal to the ecu.

If you haven't changed anything on the car, then the tune should still be 'good'

Hope that makes more sense...

No need to apologize... That is a VERY GOOD thing to stay focused on!

jason

Hmm I ask my tuner (Don Walsh Jr.) if he thinks I should get one.

Yeah school is intense here at Kettering University (Old GMI) aka crazy engineering school. lol

HISSIN50 · Nov 1, 2007

Fox8950 said:
Yup sure did, thought one of those things got cut out in OL thank u much for clearing that up.

Part of the issue is your choice of terminology. Cut out suggests shut off in my mind and that simply is not the case. As Jason noted, even if the O2's are being ignored as far as trim goes, their signal is still monitored and utilized.

Autometer Wideband O2 Gauge WOT Switch?

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