excelerator pump

[Clive Apps Techno-Logicals 416 510 0020]

> 
> Diodes my goodness, I've built this very same thing dozens if not
> a hundred times, without them and it never worked with a s----.
> Dang,
> Thanks

> See, just an extra moment and you saved a least me oddles of time.
> 714, right?.  .01 mfd  1N914's.  Just  asking cause it means hours of
> work sayed if you already have some clues about where to start.

914s or similar should be fine
might want somthing a little heavier depending on the size of the cap used
cap size depends more on (moron ??) how long you want the enrichment to last
you might try an adjustable cap but size will be in the larger ranges mabey
10-1000uF or maybe a cap decade box til you get in the range you need
then one large cap and a smaller adjustable one say split at 2/3 1/3 total

> Don't need a final perfect design but just a hey start maybe with this.
>   BTW, for a analog car dealy can we get by with the single source
> power supplies?.  Or for the op-amp stuff do we need the extra
> neg power supply?.

since TPS max is usually in the 5v range the -ve sense can be designed in by
offsetting the voltage source 
actually as soon as the comparator goes -ve the fuel delivery can be 
cut completely off, an RPM sensor can turn fuel
back on at 1000 RPM or so to prevent stalling (unless idle is higher of course)

>   Thanks Again
> Bruce     Despite published reports the BBQ, and Propane incident
>                here at CSH, HQ was less than 5 digits of damage, and no
>                loss of life..  Well maybe a bunch of insects.
> 
> 
> >>
> >> can someone come up with a circuit that will take the output from the
> >> throttle position sensor (0-5v), and sense when it has been suddenly
> opened?
> >> ie. if you open the throttle suddenly the output goes high...
> >use a comparator
> >put the output of the TPS on 1 sense
> >put the output of the TPS on the other sense with a capacitor that charges
> up
> >
> >put diodes in both lines at the TPS to isolate them
> >out a small resistor as a pull down on the cap
> >
> >when you tromp it the capacitor will take a while to charge up
> >while there is a difference the output can be configured to be either
> >logical 1/0 or a proportional value related to the difference which can be
> used
> >to control the amount of enrichment
> >adjusting the capacitor size can control the amout of time that the
> enrichment
> >is active
> >additionally it can take a little time time to charge adding a starting
> >enrichment for a brief time period
> >
> >adjusting the resistor can be used to control a decel enleanment circuit
> >by allowing a -ve compare output sense while the cap discharges
> >
> >simple but elegant
> >
> >Clive
> >
>