Re[2]: Stock CIS, running out of gas at 2 bar?

[Russell S Southerlin <Russell.S.Southerlin@lmco.com>]

Orin,
After I posted that response I did remember that I forgot about the full 
throttle switch and was wondering if someone would know how it comes into 
play - good catch. 

One question, if my computer uses this air plate position to calculated 
miles per gallon I wonder if you could calibrate (maybe add an adjustment 
pot or resistor) it to give the correct value - mine is always about 4-6 
mpg high in city driving. 

Russ


______________________________ Reply Separator _________________________________
Subject: Re: Stock CIS, running out of gas at 2 bar?
Author:  orin@wolfenet.com at MAILHUB-SMTP
Date:    10/23/97 5:19 PM


> Scott,
> You wrote:
> >I don't know if the fuel distributor plunger
> continues to output more fuel all the way to the top of the 
> plate travel or if it tops out earlier.
     
> I think from taking my fuel dist apart (maybe something good can come 
> from destroying a fuel dist.) that once the plunger clears the top of 
> internal slits that meter fuel to the injectors you would not deliver
> more fuel to the injectors with increased plunger travel given a steady 
> state lambda circuit (I don't know how you could determine this point
> except by measuring plunger height). But you could deliver more fuel via 
> the lambda circuit. If the ECU detected a lean condition I think it
> would try to correct it by changing the dwell on the lambda circuit
> unitil it was at a full rich condition (OXS F/V full open) in which case 
> if the plunger was at full travel you would have max fuel delivery.
     
Not at WOT.  The O2 sensor isn't used at WOT and a fixed table is 
used for the frequency valve - 68% at high RPM.  Current wisdom is 
to set the duty cycle around 40% at idle, so this already gives 
extra fuel at high boost and RPM... sounds like we need to do some
measurements of fuel delivered vs sensor plate position and frequency 
valve duty cycle.
     
Orin.