[Diy_efi] Time delay relay?

[Mike]

At 12:13 AM 24/12/2002 -0800, you wrote:

Yeah thats it but, based on the expectation here's some pullup
in the ECU to pull the input high when the switch opens, some
have 10K - some have 100K up to a megohm, so find what caps you
have in the junk box or go to your nearest electronic store and
get some decade sets, like 1uF, 10uF, 100uF and a couple inbetween,
they are really cheap so altogether shouldnt cost more than A$2,
bit of trial and error and you should get precisely what you
want. No need to go over 16VW on the cap specs unless its handling
ignition voltage - then go for 35VW (VW=Volts Working) etc,

The only minor issue is if the ECU input you are using doesnt
have a schmitt trigger on it, if that input is normally used
for switching tables then I'd expect it would, in the event
it doesnt you'd probaly notice noise at the switch voltage
which is either cmos or ttl levels, But I guess its probably
an input to the s/w so it might have its own debounce timer as well,

rgds

mike


>Like this?
>
>
>GND-------SWITCH---------------------ECU
>                                              |
>                                              |
>                                              |
>                                              +
>                                         10uf cap
>                                              -
>                                              |
>                                              |
>                                              |
>                                           GND
>
>> What is the input precisely used for -  on the ECU ?
>
>Triggering a massive change in the fuel tables. I have a large shot of
methanol
>I turn on, and the switch is the pressure switch on the pump head. The
pressure
>switch activates when pressure gets built in the system, but before the
methanol
>actually reaches the cylinders. Just trying to make the ECU wait for the
>methanol before cutting back on the gasoline.
>
>
>_______________________________________________
>Diy_efi mailing list
>Diy_efi at diy-efi.org
>http://www.diy-efi.org/mailman/listinfo/diy_efi
>
>

_______________________________________________
Diy_efi mailing list
Diy_efi at diy-efi.org
http://www.diy-efi.org/mailman/listinfo/diy_efi