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Re: MAF and 89 Vet stuff
There should be a mph setting to force tcc. I am not familiar with specific
addresses in the 747 code so maybe someone else here on the
list can help.
I've never played with the tcc stuff. If I remember correctly the tables
have
to do with % throttle. I don't know what the constant does.
Mark
----- Original Message -----
From: "Dominic Sorresso" <surrexi2@home.com>
To: <gmecm@diy-efi.org>
Sent: Sunday, August 13, 2000 1:25 PM
Subject: Re: MAF and 89 Vet stuff
> Mark,
>
> So how can I eliminate kickdown at hi-speeds. Do I use the constant tables
> or the TCC lockup
> tables?
>
>
> Dominic
> ----- Original Message -----
> From: "Romans, Mark" <romans@starstream.net>
> To: <gmecm@diy-efi.org>
> Sent: Sunday, August 13, 2000 12:14 PM
> Subject: Re: MAF and 89 Vet stuff
>
>
> > Turbo city has you using an automatic trans memcal. They are using tcc
to
> > control the od.
> > Mark
> > ----- Original Message -----
> > From: "Dominic Sorresso" <surrexi2@home.com>
> > To: <gmecm@diy-efi.org>
> > Sent: Sunday, August 13, 2000 8:39 AM
> > Subject: Re: MAF and 89 Vet stuff
> >
> >
> > > I upgraded my 84 ECM to a 7747 from Turbo City. My 4+3 OD works well
> > enough
> > > although not exactly as original. In the original program from TB
City,
> it
> > > would not engage when flipping the switch. Later, Turbo City provided
> > > iterations of the chip which enabled OD operation thru switch and
> > > accelerator. My only real problem at this point is that the trans will
> > drop
> > > out of OD at hi speed when TPS is near or at closing. Can't tell at
this
> > > point but I would estimate about 20% TPS. However, kickdown to direct
> will
> > > happen at about 74mph. Therefore it will coastdown in OD say from
85mph
> > with
> > > <20% TPS until it reaches 74 mph at which point direct gear is
engaged.
> > > Tapping accelerator brings back OD. At low speed, OD disengages at
34mph
> > > with <20% TPS. OD operation was enabled with NO pin reconfiguration at
> > ECM.
> > > Is there any way to remedy (eliminate) kickdown at hi speed either
with
> > > software change or pin reconfig?
> > >
> > > Dominic
> > > ----- Original Message -----
> > > From: "Shannen Durphey" <shannen@grolen.com>
> > > To: <gmecm@diy-efi.org>
> > > Sent: Sunday, August 13, 2000 6:52 AM
> > > Subject: Re: MAF and 89 Vet stuff
> > >
> > >
> > > > 89 Calibration is different, as it's for a 6 speed. There's no
> > > > control for the o/d unit.
> > > >
> > > > The 88 schematics are on the ftp site. IIRC, Pin C8 is O/D switch
in
> > > > 86. In 87 they moved the O/D sw to pin c7 and put a a first gear sw.
> > > > in the trans which connects to pin c8. Leave c8 open and the o/d
> > > > operation will be the same as you're used to. You might be able to
> > > > use the an auto cal., use tcc tables for o/d, and use a different
> > > > switch for o/d control. It would be an interesting project.
> > > > Shannen
> > > >
> > > > J. T. Spilman wrote:
> > > > >
> > > > > I just upgraded my 4+3 85 to an 89 ECM I jumped two wires to get
the
> > O/D
> > > > > switch to work. What pins did you move to get the O/D to respond
> > > correctly?
> > > > >
> > > > > Thanks
> > > > > JT Spilman
> > > > >
> > > > > -----Original Message-----
> > > > > From: owner-gmecm@diy-efi.org [mailto:owner-gmecm@diy-efi.org]On
> > Behalf
> > > > > Of Shannen Durphey
> > > > > Sent: Saturday, August 12, 2000 11:25 PM
> > > > > To: gmecm@diy-efi.org
> > > > > Subject: Re: MAF and 89 Vet stuff
> > > > >
> > > > > 88 4+3 is still better than 86. Requires moving one pin at ecm.
> > > > > Shannen
> > > > >
> > > > > Romans, Mark wrote:
> > > > > >
> > > > > > If someone has an 86 and it's an automatic I would strongly
> > recommend
> > > that
> > > > > > they convert to 89 code because it's much better supported and
> runs
> > > better
> > > > > > and eliminates the cold start injector. If they have a 4+3 they
> are
> > > > > > screwed.
> > > > > > Mark
> > > > > > ----- Original Message -----
> > > > > > From: "TK" <terryk@foothill.net>
> > > > > > To: <gmecm@diy-efi.org>
> > > > > > Sent: Saturday, August 12, 2000 2:44 PM
> > > > > > Subject: Re: MAF and 89 Vet stuff
> > > > > >
> > > > > > > hey Mark,
> > > > > > >
> > > > > > > Is the 86 Y body the same as anything else? I don't remember
> > working
> > > on
> > > > > > it.
> > > > > > > I think that's the 7703 ECM.
> > > > > > >
> > > > > > > Terry
> > > > > > >
> > > > > > > ----- Original Message -----
> > > > > > > From: Romans, Mark <romans@starstream.net>
> > > > > > > To: <jwn@sgi.net>
> > > > > > > Cc: <gmecm@diy-efi.org>
> > > > > > > Sent: Saturday, August 12, 2000 10:12 AM
> > > > > > > Subject: MAF and 89 Vet stuff
> > > > > > >
> > > > > > >
> > > > > > > > Hi Jason: I may be able to help you. I had saved your
> messages
> > > > > > intending
> > > > > > > > to respond, just a time thing you know.
> > > > > > > > I will try to go through each of your messages and respond
to
> > each
> > > > > > > question.
> > > > > > > >
> > > > > > > > Question 1.
> > > > > > > > Questions on MAF equipped 89 Vette. Using Diacom for some
> time
> > > now
> > > > > and
> > > > > > > have
> > > > > > > > some questions about the different cell numbers used for
fuel
> > > trims.
> > > > > > What
> > > > > > > > tables dictate the amount of fuel used in open loop mode? I
> > > > > understand
> > > > > > > that
> > > > > > > > in closed loop the MAF, O2, etc. determine the proper amount
> of
> > > fuel
> > > > > to
> > > > > > > > deliver and adjust the short and long term fuel trims. What
> is
> > > > > modified
> > > > > > > to
> > > > > > > > control the fuel delivered in open loop and PE? I assume
its
> > the
> > > MAF
> > > > > > > tables
> > > > > > > > but I need educated on what the values represent.
> > > > > > > >
> > > > > > > > Response. The BL is a group of cells numbered 1-15 in the
> > > following
> > > > > > order
> > > > > > > > (As I consult my hand drawn chart)
> > > > > > > > Starting on the bottom left, left to right and each
successive
> > row
> > > > > goes
> > > > > > on
> > > > > > > > top of the prev one. I put the zero's in front of the
> > > > > > > > single digit numbers to preserve the spacing.
> > > > > > > >
> > > > > > > > 12-13-14-15 L F
> > > > > > > > 08-09-10-11 O L
> > > > > > > > 04-05-06-07 A or O
> > > > > > > > 00-01-02-03 D W
> > > > > > > > RPM
> > > > > > > >
> > > > > > > > The rpm boundary numbers stock (These go on the lines
between
> > the
> > > > > boxes)
> > > > > > > > 1000,1200,2000.
> > > > > > > > The flow boundary numbers stock, 14 grm/sec, 22,34.
> > > > > > > > These are the block learn memory cells.
> > > > > > > > The fuel settings are "Initial fuel*(BLM/128) = adjusted
fuel.
> > > This
> > > > > is
> > > > > > as
> > > > > > > > BL takes fuel out (Lower number) or adds
> > > > > > > > fuel (Higher number)
> > > > > > > >
> > > > > > > > I would not really suggest messing with the maf calibration
> > tables
> > > > > much
> > > > > > if
> > > > > > > > you can avoid it. I have done some small adjustments
> > > > > > > > in the first table to add about 10% (Below 30 grams/sec) to
> > > compensate
> > > > > > for
> > > > > > > > the ported maf in my car. Other than that I have the
> > > > > > > > injector constant set stock and run about 50 lbs fuel
> > > pressure(With
> > > > > > vacuum
> > > > > > > > line off) at idle. This seems to keep the BL and INT
> > > > > > > > close to 128 at all areas.
> > > > > > > > At all times the maf is used to calculate the correct amount
> of
> > > fuel,
> > > > > > this
> > > > > > > > is closed loop and open loop. There are tables to add fuel
in
> > > open
> > > > > loop
> > > > > > > > I have never messed with these. The only fuel table I mess
> with
> > > is PE
> > > > > > vs
> > > > > > > > RPM. This allows me to command a richer afr when in pe and
> the
> > 02
> > > > > > sensor
> > > > > > > is
> > > > > > > > ignored. Diacom says I am commanding about 12.0 to one at
> WOT,
> > I
> > > know
> > > > > > > it's
> > > > > > > > not really that rich, but then I am maxing out the MAF (255
> > > grms/sec)
> > > > > at
> > > > > > > > about 4700 rpm's.
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > > Question 2.
> > > > > > > > I just bought GMEPro and it looks really cool. I understand
> the
> > > > > basics
> > > > > > > but
> > > > > > > > need to gain more knowledge. I had posted a question about
> > block
> > > > > learn
> > > > > > > > cells 0-15 and what in GMEPro controls the amount of fuel
the
> > ECM
> > > > > starts
> > > > > > > out
> > > > > > > > with. I also want to know how to control open loop idle so
> when
> > I
> > > > > build
> > > > > > > the
> > > > > > > > Superrammed 383 with 30 pound injectors I can make the car
> idle.
> > > > > > > >
> > > > > > > > Response to question 2.
> > > > > > > > See response to question 1. Reset the injector constant, I
> > would
> > > set
> > > > > > both
> > > > > > > > the single fire and double fire to whatever size injector
you
> > are
> > > > > > using).
> > > > > > > >
> > > > > > > > Question 3.
> > > > > > > > For instance: I have the GMEPro software. There are 6 MAF
> > tables
> > > and
> > > > > a
> > > > > > > > scalar for each table. What do these affect? It seems by
> > > changing
> > > > > the
> > > > > > > > scalar you can affect the entire table. The constants are
> > listed
> > > as
> > > > > > > counts.
> > > > > > > > Counts? What is meant by counts?
> > > > > > > >
> > > > > > > > Second, Say when I build my 383 and install 30 lb injectors.
> My
> > > > > closed
> > > > > > > open
> > > > > > > > loop idle will be way rich. How do I reduce BPW at idle
with
> > the
> > > > > bigger
> > > > > > > > injectors?
> > > > > > > >
> > > > > > > > Response to question 3. See response to question 1 & 2. If
> you
> > > reset
> > > > > > the
> > > > > > > > injector constant to 309 lb/hr injectors. The ecm will
> > > > > > > > calculate the correct injector pw at idle.
> > > > > > > >
> > > > > > > > BTW what trans are you using? I have done hundreds of proms
> > > getting
> > > > > my
> > > > > > > 355
> > > > > > > > cu in, superram/ 6sp vet dialed in.
> > > > > > > > I may be able to help more.
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > > Mark Romans
> > > > > > > >
> > > > > > > > ICQ#66838770
> > > > > > > >
> > > > > > > > Chicks dig scars.
> > > > > > > > Pain is temporary.
> > > > > > > > Glory is Forever.
> > > > > > > >
> > > > > > >
> > > > > >
> > > > >
> > >
> >
>
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> > >
> >
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