[Diy_efi] Lucas Digital-P

[Daniel R. Nicoson]

Bruce,

We're discussing extra injectors over on the jyturbo forum.  You know
electronics.  If we want to add a second injector for each cylinder (Ford
EEC) can we get away with just wiring one in parallel?  Will the transistor
handle the extra load?  Will we change the voltage too much so that it won't
open either injector?

My understanding is that the Ford EEC takes the injector circuit to ground
to complete that circuit and activate the injector.)

If we can't do that the simple way, is there a simple circuit that would
just use the stock signal and provide the current-voltage for the second
injector and give us the same pulse width?  (If we get fancy we'd like to be
able to twist a trim pot to get a set percentage of the EEC generated pulse
width).

Any thoughts?

Thanks,

Dan Nicoson

-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On
Behalf Of bcroe at juno.com
Sent: Wednesday, July 09, 2003 5:59 PM
To: diy_efi at diy-efi.org
Subject: [Diy_efi] Lucas Digital-P


You won't be programing a 27C64 via a serial link.
You need to erase it under a UV light, then rewrite it.

Its oganized 8K by 8, any emulator with that range
ought to be adaptable to the job.

Bruce Roe

9 Jul 03 joe bialy <joedella at yahoo.com> writes:
> My V-12 Jaguar has a Lucas 16CU Digital-P ECU. It is a NEC uPD78C10
> processor with a 27C64 memory chip and a NEC 7004(whatever that is-
> A/D?) tied into it. That processor has no internal ROM, so the 27C64
> has all of the program as well as the maps stored on it. Other than
> lacking idle control, it works very well with this motor.
>
> The Lucas ECU does a very nice job of runing the car but it would be
> nice to be able to tweak it when other mods are made to the car,
> like
> larger TB's or exhaust or whatever. Rather than replacing the entire
> ECU with a megasquirt or somesuch and recreating all of its I/O, I
> would like to experiment with remapping the 27C64.
>
> Can the three pin serial port (Txd, Rxd, SCK) on the 78C10
> be used to
> perform this, and if so, does anyone know how to talk to it?
>
> I poked around gmecm last night looking for an eprom
> emulator to pop in place of the 27C64 but did not find
> anything concrete. Has anyone ever come up with a DIY
> eprom emulator or an eprom reader/programmer? It
> would be neat to monitor and reprogram on the fly.
>
> Joe

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