Re: GTV6 L-jet mods

["Allen Mitchell" <allenom@domain.elided>]

Yes, it is the same data-I was having trouble getting the Finnish site at 
work so I found several mirror sites.
So will monkeying with the value of R103 allow you to enrich the mixture?
What we really need to do is put a V6 on a dyno and try all this stuff, but 
I guess it would be cheaper to just buy a modified ECU.


>From: James Montebello <jamesm@domain.elided>
>Reply-To: James Montebello <jamesm@domain.elided>
>To: Allen Mitchell <allenom@domain.elided>
>CC: <alfa-digest@domain.elided>
>Subject: Re: GTV6 L-jet mods
>Date: Thu, 14 Mar 2002 12:26:23 -0800 (PST)
>
>This is the same data (indeed, the same text) as the Finnish postings
>previously mentioned.  They have a lot of time on their hands in Finland. 
>:-)
>
>It appears that this guy (the Finn that originally did all of this)
>is using the term "dwell" to mean "injector on-time" or "pulsewidth".
>So, the low-rpm dwell limit is a hard limit on pulsewidth (which governs
>fuel flow with a given injector and fuel pressure).
>
>Analog electronics makes my head hurt.
>
>Since lowering the value of R106 (the rev limiter) is the useful thing
>to do, you can take advantage of the fact that running another resistor
>in parallel to the first will lower the total resistance, thusly:
>
>Rt = R1 * R2 / R1 + R2
>
>So, if R106 is normally 10K, and you run another 10K resitor in parallel
>with it, you get a 5K resistor out of it.  You could also wire in a
>potentiometer in parallel to make it adjustable.  A 100K pot would give
>you a range of about 9K to 0 (not advisable to go that low).
>
>james montebello
>
>On Thu, 14 Mar 2002, Allen Mitchell wrote:
>
> > So, has anyone here actually modified their ECU based on the info at
> > places like:
> >
> > http://users.exis.net/~audserv/mods.html
> >
> > Specifically, messed with the value of R106 to change the rev limit?
> >
> > And what of R103? What is the significance of "low-rpm dwell-limit?"
> >
> > I don't know about everyone else, but I have found used GTV6 ECU's
> > popping up on E-bay from time to time.
> >
> > Finally, has anyone actually "peeked" inside a professionally modified
> > ECU to see what they did, or does it come back potted in epoxy?
> >
> > Just wondering,
> >
> > Al "knows enough to be dangerous" Mitchell
> >
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