Adding another O2 sensor

[Bob Valentine]

Not knowing anything about it, the only problem I could see is if it's a
fixed across-the-board compensation.  If it's a intake airflow problem then
what works at 2000rpm might not apply at 5000rpm.  Sounds like applying
carb technology to EFI....  

As for the 8 A/F meters, sure would look cool but I can hardly watch 02
volts, MAP and RPM at the same time.  Now, those 8 hooked to some sort of
datalogger would be good idea, even given the inaccuracy of standard 02
sensors.  If you're gonna go that far, EGT's might be a better bet.

-> Bob Valentine
-> bob at tecmark.com

At 06:21 PM 11/1/2000 -0800, you wrote:
>Now let's say you find one day that the fueling is "off" between banks, due
>to say recent porting & runners & etc.,  and that your cylinders and
>injectors are in fine working order.  Are you then SOL for adjustability
>without reverting to elaborate sequential EFI control?  Absolutely not!
>Accel make a plug-in product called the "VIC" (short for Variable Injector
>Controller) which can offer +/- 10% BPW adjustment per injector, while using
>your conventional bank fire ECM triggers and wiring.  It's as simple as
>twisting a knob per injector, and then locking it into position.  Kinda like
>having SEFI, but without all the other associated hassles.  Two O2's,
>together with some plug reading and a VIC, could get you to where you need
>to ultimately be for balanced fueling.

>Carry this dual O2 concept one step further.............You could even
>purchase a couple of cheap (but useful) Halmeter AF30 O2 monitors, and stick
>them side by each on the dash.  This would expose a huge wealth of insight
>with regards to comparative O2 trends and magnitudes between banks.  If you
>later got "fancy", you could probably datalog the raw zirc O2 signals and
>get to the point of examining each individual cylinder event on a trend
>basis.  Although this approach would not necessarily be super accurate in
>terms of absolute A/F ratio,  it would at least be somewhat repeatable and
>illustrative for comparo purposes between cylinders.
>
>
>Walt.
>

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