(Digifiz & nitrous)

[haygood@aemail4u.com (Haygood)]

So I'm guessing that you have a temp correction map on your TECII's ignitio=
n?  If you have a map like that, then it has a decent chance of working.  M=
ight get tricky if the temp correction map changes things by percent of bas=
ic setting instead of absolutely (i.e. it's prolly good if your temp map sa=
ys, "If 150=C2=B0, then retard everything by 4=C2=B0", maybe not so good if=
 it says, "If 150=C2=B0, the retard everything by 20%").  Either way I'd gi=
ve it a try and see if you can get the performance you want out of it.  The=
 worst that can happen is that you pre-ignite your way to holy pistons!  He=
hehe.

Some systems let you tailor the rpm output signal (once-per-rev, twice-per)=
.  Are you sure Tec doesn't let you modify this?  One system I worked on le=
t you program how many tach INPUTS the system recieved, so we told it it wo=
uld get two per rev (where it really only got one), and it output two per r=
ev, so the tach gave the right reading.  The TEC doesn't necessarily have t=
o have the correct rpm reading internally if you are batch firing, but it d=
oes decrease your map resolution.  Now, these systems interpolate between t=
he bars on the graph, so that's usually no big deal. Also, some systems let=
 you change the resolution, but you are prolly using the lowest setting any=
way.=20

Don't know which the fiz would want.

BH

=20=20

--- "Scott F. Williams" <sfwilliams@comcast.net> wrote:
>Okay, so I'm going to run a Digifiz instrument cluster and running the
>tachometer off the TEC-II is one of the only hurdles to clear at this poin=
t.
>There is a tach output on the unit itself, so the question is whether or n=
ot
>the output sends a compatible signal. Here's what I've found out:
>
>TEC-II tach output: sends 12v pulses (or available system voltage >12V)
>twice per complete engine revolution.
>
>Question:
>Stock 16v ignition box: sends how many pulses per revolution at what
>voltage????
>
>And, on a more exciting note, here is my proposal for running a nitrous-on=
ly
>ignition curve on the TEC-II. I suppose that with some chip tuning, this
>would be an easy thing to do on Digifant I (and other VW systems), too.
>Please let me know what you think of the following:
>
>Nitrous oxide ignition curve: As we know well, increased air temperatures
>increase the likelihood of pre-ignition. Thus, modern engine management
>systems will retard the ignition timing when high intake temperatures are
>detected. My idea is to simply interrupt that signal from the MAT sensor a=
nd
>tell the ECU that it is blazing hot outside. This interruption will occur
>(when the nitrous system is activated) via a simple on/off switch. Bingo,
>I'll have an ignition retard (at a fixed amount that I can input) all acro=
ss
>the timing curve.
>
>What thinketh ye all?
>--
>Scott F. Williams
>NJ Scirocco nut
>'99 Subaru Impreza 2.5 RS
>Mazda 323 GTX turbo "assaulted" vehicle
>Golf GTI 16v "rollycar"
>ClubVAC: "Roads found. Drivers wanted."
>
>
>
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