You are right, WOT doesn't use O2 sensor. It only uses look-up tables.
Almost all FI engines are too rich at WOT. The factory would rather lower
power output than burn pistons etc. There is alot of room for more air to our
engines as long as you stay away from blowers, nitrous and major mods(big
heads and cams). How much is too much??? Who knows. If you're in the grey zone
you could get one of those Rich/lean indicators that run off of the O2 sensor.
Dr. Pat
----------
>From: Dak99RT@aol.com
>To: dakota-truck@buffnet.net
>Subject: DML: Important questions on any perf part that increases airflow
>Date: Tue, Apr 13, 1999, 4:35 PM
>
> OK, lets say we have an R/T with a ported throttle body (52 millimeter or B&F
> Stage 2 equivalent), Mike Leach headers, low restriction cat back exhaust,
> and a high flow air filter. This will increase the airflow into the motor
> substantially. At most RPMs the oxygen sensor will sense the additional air
> and widen the pulsewidth of the factory fuel injectors and match the
> additional airflow with the correct amount of fuel. Does any one know if the
> O2 sensor works at Wide Open Throttle? I don't think it does... it goes to
> open loop and the injector's pulsewidth is changed yet again to work at the
> factory set "fuel tables" which may at times be less fuel that needed as the
> factory settings will not know that you added these additional airflow
> devices. There is the possibility of adding too much air and the factory
> computers "fuel tables" will not provide enough fuel... leading to a possible
> lean condition that can break a motor. Does anyone know if this is possible?
> We already know that Shane and Alan's R/Ts have gone low 14s without running
> too lean because they haven't blown a head gasket or burned a valve or
> piston. But at what point does more air become too much air and need
> additional fueling like bigger fuel injectors? Mike Catlin... does your R/T
> idle correctly with your new injectors? My Turbo Buick ran rich on the street
> with my bigger injectors but was safe at WOT. Any input?
> Charles Smith
> 99 Dak R/T
This archive was generated by hypermail 2b29 : Fri Jun 20 2003 - 12:13:44 EDT