[Diy_efi] Pulse width meter

[Chris Carson]

My mother's 91 Lincoln has the gas mileage inst/avg, fuel used, range
computer thing in the dashboard. Trouble is, I'll bet the farm that it gets
a signal directly from the Ford computer. Does anyone know of a device
similar to this that will piggyback directly to the injector wires to
measure pulsewidth ? I don't suppose there's a way to get a GM ECM to output
PW/duty cycle in some unused pin?

Thanks,
Chris
----- Original Message -----
From: <clair.davis at charter.net>
To: "A list for Do-It-Yourself EFI" <diy_efi at diy-efi.org>
Sent: Sunday, December 05, 2004 9:28 AM
Subject: Re: [Diy_efi] Pulse width meter


> My understanding is that some of the 80's-90's turbo Mopars (Daytona's and
> LeBaron's in particular) had this capability.  One of the little
electronic
> gizmos that were optional back then included what is called the "traveler"
> (trip computer).  This was a multi-function computer thingy that would
track
> trip time, miles driven, ETA, total time driven, instantaneous and average
> fuel economy, time/date, etc.  I was told that by pushing the right series
> of buttons, you could check injector duty cycle, which you could then use
> for pulse-width.  The only problem I see with it is that *I THINK* they
were
> shipped out with specific codes for the body they were installed in.  That
> means one from a Turbo I New Yorker would be calibrated slightly
differently
> from a Turbo II Daytona or a VNT LeBaron.
>
> I have all the FSM's and diagnostic books from the dealer, but I haven't
> noticed a discussion of this feature.  I also haven't looked very hard,
> since it's not something that would be easily-adaptable to any other
vehicle
> I have, given Chrysler's tendency to make things difficult for
> tuners/tweakers.
>
> Clair Davis
> Fort Worth, Texas
> 67 Barracuda Convertible ?/833
> 68 Sport Fury Convertible, 440/727
> 69 Valiant Sedan 340/833/'7730
> 86 Shelby Charger T1/525
> 87 Daytona Pacifica T2/520
> http://users2.ev1.net/~clairdavis/
>
> ----- Original Message -----
> From: "David Cooley" <n5xmt at bellsouth.net>
> To: "A list for Do-It-Yourself EFI" <diy_efi at diy-efi.org>
> Sent: Friday, December 03, 2004 9:24 AM
> Subject: Re: [Diy_efi] Pulse width meter
>
>
> too many variables to base it on PW...  Would have to input RPM, MPH,
> Pressure etc...
> best to use a flow meter (on a returnless system... on a return system,
need
> 2 flow meters, one for incoming, one for return to subtract that volume),
> and MPH
>
>
> -------Original Message-------
>
> From: Chris Carson
> Date: 12/03/04 09:57:40
> To: A list for Do-It-Yourself EFI
> Subject: Re: [Diy_efi] Pulse width meter
>
> Has anyone ever used a pulse width meter to provide information for a gas
> mileage/fuel used/trip computer?
>
> Chris
>
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