[Diy_efi] Early Mitsubishi EFI tuning

Steven P. Donegan steve
Mon Oct 9 12:55:49 UTC 2006


Right now it is frequency in * % adjustment and frequency out - it is
intended in the future to track a desired A/F ratio from a wideband O2
sensor and adjust the frequency as required to seek a particular goal.

On Mon, 2006-10-09 at 11:41 +1000, Ben P wrote:
> a question about the board...
> 
> does it work anything like the silicon ship Digital Fuel Adjuster? 
> http://autospeed.drive.com.au/cms/A_2418/article.html
> 
> that kit has 128 steps of adjustment, with each 'steo' being assigned a 
> different voltage and having a different, pre-programmed, adjustment value. 
> the adjustment is a 'voltage in + adjustment value = voltage out'. Is yours 
> like that (but with frequency)?
> 
> thanks
> Ben
> 
> 
> >From: "Steven P. Donegan" <steve at donegan.org>
> >Reply-To: diy_efi at diy-efi.org
> >To: diy_efi at diy-efi.org
> >Subject: Re: [Diy_efi] Early Mitsubishi EFI tuning
> >Date: Sun, 08 Oct 2006 09:05:35 -0700
> >
> >Well, Interceptor is a generic term used by the Oz folks mostly -
> >devices which intercept signals from car sensors, apply some logic to
> >them and present the changed signals to the original car EMC. The one I
> >designed is here: https://www.microvore.com/interceptor.jpg
> >
> >If the MAF does frequency output my board may well do the trick - it
> >also has analog inputs but no analog outputs at present.
> >
> >On Sun, 2006-10-08 at 10:56 -0500, The AirHawk wrote:
> > > > Ok another question about tuning an old manufacturers computer...
> > > >
> > > > The first of the fuel injection systems on the Mitsubishi Magna's were 
> >attached to the FWD version
> > > > of the ASTRON II engine, and I also believe that they had that awful 
> >Karman-Vortex air-flow meter
> > > > with a frequency output instead of a voltage.
> > > >
> > > > The first series of questions are:
> > > >
> > > > Can these computers be remapped? And if they can, how is it done?
> > >
> > > Try here:
> > > http://dsm-ecu.com/
> > > Or here:
> > > http://groups.yahoo.com/group/dsm-ecu/
> > >
> > > If your Magna uses the OBDI-type eprom ECU, as used in '90-'94 DSMs 
> >(Eagle Talon, Mitsubishi
> > > Eclipse, Plymouth Laser)with the 4G63 engine, you'll probably find your 
> >answer. If your ECU is
> > > different, they might be able to point you in the correct direction. 
> >There are a LOT of very
> > > knowledgeable individuals on the yahoo-group message board.
> > >
> > > A word of warning: the yahoo-group will be most helpful in getting you 
> >going, but they have little
> > > tolerance for "Hey somebody send me a file!" or "Would somebody code 
> >this so I can install this
> > > widget on my car" kind of "requests". They'll help you, help yourself. 
> >(not that I think you'll do
> > > that, I just wanted to put out a general warning about it)
> > >
> > > > I have heard of various early computers using the EPROM chips, would 
> >they use this? And if they
> > > > do, does anyone possess a program that can convert the file from the 
> >eprom dump into a magageable
> > > > form (such as the TunerCat for GM computers)?
> > >
> > > There are a few programs tailored for the DSM-ECU on the yahoo-groups 
> >site. You'll have to join for
> > > more details.
> > >
> > > > And the last question is simple, has anyone heard of an interceptor 
> >being successfully used on
> > > > this computer?
> > > >
> > > > the reason behind asking all of this: A friend is building an early 
> >RWD Lancer, with a
> > > > turbocharged 2.6L Astron engine, and has an injected magna that he is 
> >putting the turbo kit on
> > > > first, just to make sure everything runs.
> > >
> > > Sorry, interceptor? Are you talking of an auxilliary fueling computer?
> > >
> > > > thanks
> > > > Ben
> > >
> > > N.P.
> > >
> > > -Scott C.
> > >
> > >
> > > _______________________________________________
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> >--
> >"Each new law makes only a single guarantee. It will create new
> >criminals."-- John Tandervold
> >
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> _________________________________________________________________
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