I used to think that way also. Now....I'm not so sure. Check out the following link:
http://www.dickselectronics.cjb.net/
That would be cool if you could just do some processing of the existing O2 sensors signal
and end up with an approximation of the A/F of each cylinder. I have a data acquisition
board that can read four channels of analog +-10V signals. It can sample at 240 samples
per second. Not sure what the input impedence is tho - wondering if I can do some
processing of my own to see what shows up on our signal.
Thoughts?
Latr,
Shane
chris@slowcar.net wrote:
> Maybe I missed out on part of the discussion (sorry) but the reason
> for the bouncing is because the truck is operating in Closed loop and you
> are close to 14.7:1 where the O2 transfer function is VERY steep so even
> the exhaust pulses will cause "bouncing"
>
> If you are trying to determine anything tuning wise from stock O2's you
> should just give up. :) Seriously, take a look at this document I just put
> up - it gives a good explanation with graphs as to why this will not work well.
>
> http://shared.slowcar.net/o2_volts.xls
>
> If you want any meaningful info you need to switch to a wideband. You
> *could* possibly use the Bosch LSM-11 sensor instead, which is basically
> a refined and hand picked stock type sensor (only one nernst pump, normal
> wideband is pretty much 2 - one actually controls permeability). This would
> work with a standard style meter, though a digital readout would be the only
> way to do it justice. Pricey though. The other option is a NTK style
> 5 wire wideband, which is what horiba, etc. use - but you need to a controller
> circuit for one of these, there are a couple of diy-efi projects out for this circuit
> on their homepage. (diy-efi)
>
> Chris Bennight
> http://www.slowcar.net
> 66 Charger for sale
> http://charger.slowcar.net
>
> ----- Original Message -----
> From: "John Neff" <jndneff@texas.net>
> To: "Dakota Mailing List" <dakota-truck@buffnet.net>
> Sent: Tuesday, July 10, 2001 11:10 PM
> Subject: DML: Re: Intellitronix A/F meter
>
> | Right, but if this is a good gauge, I can do it without the added expense of
> | another O2 sensor and the labor to install the bung. Plus, it's an analog
> | gauge which I would prefer since everything else in the truck is analog. I'm
> | just curious if anyone has used Intellitronx gauges and if so, was it a good
> | buy for them?
> |
> | John
> |
> | >You can do it (no bouncing) with an extra O2 sensor.
> |
> |
> |
> |
> |
-- '96 IndyRam-HisIndy-MPI TB Pulleys RTcam MPComp HVoilpump DynaGearDoubleRoller WindageTray CompTAs '96 IndyRam-HerIndy-numbered(#142)"Track Truck" '74 Triple-Black Dodge Challenger Rallye 360 EFI R&D vehicle '93 Dakota CC 318 - soon to be mine 8)
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