Re: GTV6 L-jet mods

[James Montebello <jamesm@domain.elided>]

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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