idea..

[Paul Ruschman]

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	The early, 68-73, Datsun 510's with automatics had some kind of speed =
sensor attached to the speedo cable. This thing is basically a splice of =
the cable. It is located on the firewall toward the top in the middle. I =
think it was used for the BCDD on the carb, (Boost Controlled =
Deceleration Device, or informally known as "Get this High Idle thing =
off my car!")


			BRAAP

----------
From: 	Paul Raley[SMTP:raleyp at UDel.Edu]
Sent: 	Monday, October 06, 1997 8:07 PM
To: 	diy_efi at coulomb.eng.ohio-state.edu
Subject: 	Re: idea..



> someone mentioned trying to locate fuel flow meter to use for a =
mileage
> calculator.  Why not have the ecu record the combined pulse width over =
a
> period of distance, based on the assumption that fuel pressure remains
> fairly constant, a certain distance traveled divided by the time the
> injectors are open =3D=3D MPG. All is needed is a pulse input from =
oneor more
> of the wheels,  each pulse =3D a certain distance ,and the frequency =
is the
> speed.

why could you assume the fuel pressure remains the same?  on my nissan, =
not
only does the fuel pressure regulator (which not everyone has) alters =
the
pressure, but the ECU controls the voltage of the pump, thereby varying
pressure from 20psi to 60psi or more.   Don't other modern ECU's control =
the
fuel pump voltage?

If you have a digital dash as on the nissan, the speed sensor could be =
used.
This transmits two pulses for every revolution (optical).  The analog =
dash
uses the same setup except that its magnetic and located in the dash =
itself.
There are a number of Z's in the junkyard with these sensors located =
next to
the battery under the speed control device.

Paul R.





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