8051 EFI

[mike mager]

[complete message below]

>My toy is based around a Renault Alpine 1400cc cross flow -

Four cylinder . . .

>Then some 'erb told me that fuel injecting that lump was immpossible 
>period.

Hilarious!  I have learned that when some jerk says, "you can't do that", he 
really means, "I (jerk) can't do that".

>Wonder how far down stream I need to mount the sensor on a 4-into-1 
>exahuast....

I lack practical experience on the custom side, otherwise, just copy the 
OEMs (tough with four into one).  Oh, 'PS'-like, look at some 
emissions-legal V-8 exhaust, see how they do four into one!;  that will 
work, and you do have a heater.

>As far as the software goes, most of the problems I have can be put down to 
>the fuel map - at the moment, a best guess data.

On to tuning, then.

>With a lambda sensor, I hope to have a self teach mode.

Sure, the OEMs do.

>Communication with a laptop is one area that needs to be sorted.

That, or similar, is what many of us would like.

>Then I can have a go at the ignition system - some bright spark will tell 
>me it can't be done.

Right;  . . . "would you hold this wire for me?" . . .

>So there you have it, four sequential injectors and two coils on a 
>100x160mm board.
>Still interested ?

The size sounds great;  I do need the capacity to run more cylinders, so, 
still thinking about implementing something of my own design/construction 
(non-urgent, still plenty of time).

Thaks, Paul,
Mike


>From: Paul Corner <Paul.Corner at tesco.net>
>Reply-To: diy_efi at diy-efi.org
>To: diy_efi at diy-efi.org
>Subject: Re: 8051 EFI
>Date: Mon, 27 Mar 2000 22:23:49 +0100
>
>
>Hi Mike
>
>My toy is based around a Renault Alpine 1400cc cross flow - originally 
>fitted
>with some horrible down draught carb. Ran it for a couple of years with a 
>pair
>of Webber DCOE's. Then some 'erb told me that fuel injecting that lump was
>immpossible period.
>So I rigged up some throttle flaps, one for each cylinder, and breadboarded 
>a
>simple control based on the SSI 67F687. It ran, eventually. But since the 
>chip
>never made it to the market, it was time to have a rethink.
>
>Picked up a 4 wire Lambda sensor today - so once I've added a boss to the
>exhaust pipe, I can play around with a closed loop control. More questions 
>-
>differential input buffer, input impedance, low pass filter, cut off
>frequency...  I suppose suck it and see.
>Wonder how far down stream I need to mount the sensor on a 4-into-1 
>exahuast....
>
>As far as the software goes, most of the problems I have can be put down to 
>the
>fuel map - at the moment, a best guess data. With a lambda sensor, I hope 
>to
>have a self teach mode. Communication with a laptop is one area that needs 
>to
>be sorted. Then I can have a go at the ignition system - some bright spark
>will tell me it can't be done.
>
>So there you have it, four sequential injectors and two coils on a 
>100x160mm
>board.
>Still interested ?
>
>Regards, Paul.
>
> > Very intersting!  Yes, I am always interested in what somebody can think 
>of, and get to function; and, no (probably) not interested in getting one 
>(yet), but I'm not even sure . . .
> >
> > [Those aren't puns - I _hate_ puns!]
> >
> > When I subscribed to the '332 list, I was just a bit too late into the 
>'332 project, and by the time I had thought it over, the group buy was 
>closed. Is yours oriented to a four-cylinder engine?  I really need to do 
>some planning on the whole EFI matter!  I drive a carb'd vehicle - with an 
>integral intake manifold! - so hacking an ECM on my 'daily driver' is out.
> > My 'big project' engine is not even in hardware yet (design only).  
>Maybe I do want to scratch-build my own;  wouldn't be 'better' than any 
>other, but it would be optimised for my application (yeah, right, buddy), 
>and I would know the 'why' of every little detail.  Some of us have a drive 
>to do that! (you know)

> > On the software, no major snag, I hope?
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