More On Re: <VV> Electronic Fuel Injection

[FrankCB at aol.com]

John,
       Why use NB (narrow band) oxygen sensors?  They are OK for running at 
stoichiometric (around 14.6 or 14.7 to 1 A/F ratio depending on your exact 
gasoline composition) but for richer high performance A/F you really need WB (wide 
band) O2 sensors that can indicate 12 to 1 A/F (for power) or 16 to  A/F (for 
cruising fuel economy) or anywhere in between.  And Bosch has a newer WB O2 
sensor that's in the $50 to $60 price range.
       And why worry about HC and CO emissions?  Any Corvair with properly 
setup fuel injection will put out MUCH fewer emissions than a stock NEW Corvair 
right from the factory ever did.  Except for worn out oil burners, that is(:-)
       Frank Burkhard
        
In a message dated 8/16/05 11:13:45 PM Eastern Daylight Time, jdozsa at carr.org 
writes:

> I'm designing a bolt-on TBI system for a street stock 140 HP Corsa.  The
> engine controller will be a highly custom version of the Megasquirt
> hardware and software.  Four TBI units in the stock locations with dual
> bank injection and dual O2 NB sensors.  Secondary TBI air valves will be
> mechanically progressive opening similar to the stock 140 HP carb
> setup.  Secondary fuel injection will be progressive also, based on TPS
> and MAP values.  After the secondary TPS and MAP trip points are
> reached, secondary TBI fuel delivery will be a percentage of the
> calculated primary TBI value.  I'm still undecided about the head
> temperature sensor, thermistor or thermocouple.  With custom hardware
> and software either is possible.  The biggest effort will be rewriting
> the software to use separate O2 sensor feedback for each bank.  This is
> primary a electronics project and is much different than just
> configuring ECM tables or burning new PROMs.
> 
> Seth, what's the HC and CO spec?  Can I use my own custom gasoline blend
> to meet them?  :-)  And, no this project will not be done anytime soon!
> 
> John Dozsa
>