RE: EFI vs. CIS

[glen powell <quattro@acacianet.com>]

>Glen wrote:

>>Add an auxiliary mixture enrichment system that leaves normal operation,
>>drivability, emission and reliability totally unaffected and operates
>automatically 
>>only when needed under high boost conditions.

>>-glen

>You're right, that's the middle ground between my two "options".  If there is
>an auxiliary injection system that gives good mixture distribution and is
>intelligent and well-integrated enough to keep the car from leaning out or
>detonating, I'd be willing to give it a try!  

>If what I remember reading of Scott Mockry's post still serves, the air flow
>plate on an MC car is pretty close to the end of its travel in the high RPM
>range at the 1.8-2.0 BAR level.  So the system would have no real, direct way
>of sensing air flow at that point and would have to infer it somehow in order
>to meter additional fuel.  I suppose that you could develop a standardized map
>for metering the fuel at a given RPM, inlet air temperature, and boost level,
>or it could monitor the OXS sensor to tailor the fuel delivery.  As long as
>max. boost levels and knock sensing were still under the control of the ECU, I
>don't see why that couldn't work.  

The system I use (Calaway/Miller-Woods MicroFueler) addresses these issues. It does not
rely on the airflow meter for data. It uses RPM and boost level data to control mixture-enrichment
delivery under boost. Enrichment is also highly and independently adjustable as both a function 
of RPM and boost level and the injector size can also be changed to address an almost
limitless combination of fueling requirements for engines with different levels of mods. It is
easy to install, setup, tune, use and is also highly reliable. Alas, it is no longer available, but New
Dimensions has a newer and possibly even better system available now. ND: 408-980-1693


-glen