WB O2 Success

[Mark S. Riley]

posted the info back when I finished the DIY-WB back Aug or Sept. As near as
I could tell from about 11:1 up to 18:1 they matched within .1 air fuel
ratio. I've used the DIY-WB on my Dynojet  and tuned with it comparing it to
the wide band on the Dynojet also. Within a tenth or so. It changes so fast.
The Horiba and the Dynojet match within about a tenth or so. It varies
slightly as it runs. I think the sensor placement in the pipe makes a
difference and you can't put 2 in the exact same spot. So you have slight
differences that are very close. I don't have any problem trusting the
reading off the DIY-WB. Just think, If you didn't have 2 or 3 to look at,
you wouldn't see any difference to be able to pick at. I've got 3 different
wide bands with 3 different displays. Makes comparisons interesting. Usually
get several people watching different ones and discuss what happened. We're
not looking for the edge when that's happening. Some people are good
observers and others need a video camera to watch the replay. Curly, Moe and
Joe all live in the neighborhood ;} Later, Mark

----- Original Message -----
From: <Steve.Flanagan at VerizonWireless.com>
To: <diy_efi at diy-efi.org>
Sent: Tuesday, December 11, 2001 12:44 PM
Subject: RE: WB O2 Success


> Mark,
>
> Have you done any data comparison with the WBO2 and your Horiba.  Would be
> curious how this great kit brought forward by the hard work of several
> DIYers compares to the likes of a Horiba.
>
> Steve
>
>
>
> -----Original Message-----
> From: Mark S. Riley [mailto:turbotuneusltd at triad.rr.com]
> Sent: Tuesday, December 11, 2001 12:58 PM
> To: diy_efi at diy-efi.org
> Subject: Re: WB O2 Success
>
>
> I've got a Horiba and it takes 33 seconds from switch on. Ask me how I
know.
> I added 10 ohms to R4 and the DIY-WB warms up in about 35 seconds. Just a
> couple more than the Horiba and much quicker on a re-crank than the Horiba
> which again takes 33 seconds. Ask me how I know. I've had the Horiba for
> twelve years. later, Mark
>
> Of course you can add some more resistor and fire it up quicker. I
> understand the sound of the porcelin cracking is not an extremely
expensive
> sound.
>
> ----- Original Message -----
> From: "Kevin _" <kiggly at hotmail.com>
> To: <diy_efi at diy-efi.org>
> Sent: Monday, December 10, 2001 11:33 PM
> Subject: Re: WB O2 Success
>
>
> >
> > I don't know exactly how the DIY-WB board's circuitry is set up to heat
> the
> > sensor, but I do know you should be able to heat it a bunch quicker than
> > that.  The production NTK driver box heats the sensor in about 5 seconds
> and
> > the Horriba driver box heats the sensor in less than 10 seconds.  I
can't
> > confirm that you can just drop down the resistance to accomplish this
> > properly and safely though.
> >
> > Kevin
> >
> > >There should be some 15 ohm resistors left over from the parts
> > >kit. Add some of these time across R4 (the big 1 ohm), until the
> > >sensor warms up between 45 and 60 seconds. (That is in
> > >parallel with R4).
> > >
> > >BobR.
> > >
> > >
> > > >
> > > > Question:  It takes exactly four minutes for the sensor to heat up
and
> > >the
> > > > LED to light.   Is four minutes heating time typical?  This is a bit
> too
> > > > long for my liking.  I assume that there is a need to control the
rate
> > >of
> > > > heating the sensor or else we wouldn't have the elaborate heater
power
> > > > supply.   I would like to shorten the heating time if possible.  Any
> > > > comments on what the effect of shortening the heating time would be?
> > > >
> > > > Thanks,
> > > > Neil
> > > >
> > > >
> >
>
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