Bench racing ecms Even if ya hate 101 please read

[TBK]

Yep, I worked out a digital speedometer and had to run the calculations. Did
both time interval and frequency counter methods. I'll never build it, but
it was a good waste of time. I think the exact numbers are:

4004 pulse/mile output (speedo, warning,etc)
2002pulse/mile output (cruise, TFE, etc)
1.11Hz/MPH

TK
-----Original Message-----
From: Shannen Durphey <shannen at mcn.net>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Tuesday, June 16, 1998 10:41 PM
Subject: Re: Bench racing ecms Even if ya hate 101 please read


>Yup.  Should have read "outputs 7VAC @ 60hz  for 54mph."
>Additionally, some ecms use 2000 pulses/mile or 30hz @
>54mph.
>
>Apologies.
>Shannen
>
>TBK wrote:
>>
>> It's 1.11Hz/MPH
>>
>> -----Original Message-----
>> From: Shannen Durphey <shannen at mcn.net>
>> To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
>> Date: Tuesday, June 16, 1998 12:59 AM
>> Subject: Re: Bench racing ecms Even if ya hate 101 please read
>>
>> >Bruce Plecan wrote:
>> >>
>> >> I just put the hammer, and nails away from nailing the ecms down.
>> >> Actually coffee cup hooks, and rubberbands.  Got a 1'x2' sheet of
>> >> particle board, 1/2" thick, and the ecms tied to that via the
>> rubberbands.
>> >> So some barrier strips and we get to fire up the
>> >> soldering iron (well actually crimper).
>> >>
>> >> Here is what I have, and what I think I need, any thoughts comments
>> >> appreciated.
>> >> <snip>
>> >> A 50% dwell frequency generator for VSS,  hopefully this will work,
>> >>     and not have to bother with Buffer/amp, or DRAC..
>> >
>> >GM speed signal generator outputs 7VAC @ 60hz for 60mph.
>> >
>> >
>> >> A rpm signal generator, but have to work out an interface to module
>> >>      is a transformer necessary?.  Ya think just a 1.2v DC pulse would
>> >>     fire the module?.  Use a monstable 555 for the 1.2v, and then
>> >>     an adjustable astable for rpm?.
>> >
>> >Same speed signal generator, when connected to pickup coil
>> >terms on module fires it quite well.  Module sends reference
>> >pulse to ecm.
>> >
>> ><more snip>
>> >Shannen
>> >
>