Wideband integration

[daveismissing]

http://www.turbobuick.com/forums/computer-chips-101/122516-wideband-controlled-stock-type-chip-now-running-2.html

I did not realize that Wideband > ECM control loop has been out there for so long.
Should have all the kinks ironed out by now?

TOPSPEED - are you still running that original chip?


http://www.turbobuick.com/forums/computer-chips-101/122516-wideband-controlled-stock-type-chip-now-running-2.html#post1121317

was something I had wanted specifics on.

[Steve Wood]

I have used it for several years.  Right now, I have gone back to open loop because I have had a couple of wb's fail and I got nervous about the potential disaster quotient.

I tune to where I like it in closed loop than try to equal that in open loop.

[daveismissing]

What is the failure mode of a wideband?
Maybe there is some symptom we can trigger on?

[Steve Wood]

It varies...

Some times, the analog side of the circuit simply dies..not gradually, but instantly.  Other times they just start going out of calibration.

Some brands are worse than others from what I have seen.  As for as the sensor itself goes, it is probably best to mount them as far from the turbo as possible.

[daveismissing]

That sux, hmmm  take 3 systems and average.
If one is way different discard its data and "limp" home.
Not looking very economical.

[Steve Wood]

nah, once you get her dialed in...you can do it open loop, or closed loop as you desire....

[Top Speed]

Sorry,  I must have missed this thread.  Yes I still have the chip with wide band fueling correction.  It worked well.  I never had a wide band failure.  It was a one off chip that did not make it to mass production.  It can correct fueling within +- 15-20%.  I saw more benefit from it when driving throughout the year when the temperature changed.  It was able to keep the same air/fuel ratio consistently regardless of hot or cold temps.  Not really necessary but it was fun to play with.

[Steve Wood]

that is a benefit...of course, from a performance stance, one may not want the same a/f all year, but that may take larger than normal temp variations to make major swings in air density?  I am not sure on that

I think the Innovates are particularly dicey.  I see Eric suggests AEM or Plx most of the time.

Also, the more expensive versions that use the NGK sensors may be more reliable from a sensor pov.

On the other hand, Honda, etc., used the Bosch sensors in regular cars so it may be the torture we put them thru that is the problem on the sensor end.

[Pyro6]

What seems to be the advantage to the NGK sensor is the wide variety of fuels they tolerate.

[daveismissing]

Sorry,

[Steve Wood]

If you are talking about Steve Y, he gave the code to Eric from whence the SD chip evolved.

[nocooler]

Steve you need a NGK AFX with the NTK sensor - they are awesome. Throw that innovative in the trash where it belongs

http://www.hinsonsupercars.com/p-946-ngk-powerdex-afx-wideband-kit.aspx

They just work - the innovative stuff is way to flaky imo.

[Steve Wood]

they cost more than old retired guys can afford...and I figured out I got basically the same way just tuning like we always did in open loop so I am not so enamored anymore

[daveismissing]

Anyone else disappointed in how expensive the
once_upon_a_ti me_open_source megasquirt stuff has become?

[Steve Wood]

no...in the end, it will not outperform the factory ecm which is extremely sophisticated

great for the guy that likes to play and has an oddball car