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?
Autometer Wideband O2 Gauge WOT Switch?
- Thread starter soontobefastfox
- Start date
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
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
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.
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.
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....
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.
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
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
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
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.
