'749 questions

[rr]

I think it started with a boosted '749 Fiero then morphed into 808
and map stuff. I think the 808 was mentioned since there is boosted
code available for it? Anyway, the '749 MAP & boosted '808 MAP
would require the same equations & routines.

This would also be true if someone were to add the required code for
2 or 3 bar to a '730 (hint-hint).

BobR.

Programmer wrote:

> I'm probably mixed up myself--I thought they were talking about the '808
> since
> it's MAP based ?
>
> Lyndon.
> ----- Original Message -----
> From: rr <RRauscher at nni.com>
> To: <gmecm at diy-efi.org>
> Sent: Saturday, July 14, 2001 11:41 AM
> Subject: Re: '749 questions
>
> > I'm not too sure if I'm following this thread. So if this isn't what is
> being
> > asked. . .
> >
> > The '749 w/a 2bar map scales the 2bar map reading into another 1 bar
> > map value. Then the code has access to both a 2 bar & a 1 bar value.
> > The conversion is: 1MapAdc = ((2MapAdc * 135) - 400) / 64
> >
> > The code uses the 1bar map for stuff like baro & vac conversions.
> >
> > When the MAP BPW term is calculated the code checks the option
> > bit to see if it is running a 2bar or 1bar MAP. Then one of two routines
> > are used. The 2bar MAP BPW term is calculated with:
> >
> > MapBpw = ((2MapAdc * 200) / 256) + 8 + CRY
> >
> > The 1bar MAP BPW term is calulated with:
> >
> > MapBpw = ((1MapAdc * 189) / 256) + 21 + CRY
> >
> > BobR.
> >
> >
> > Programmer wrote:
> >
> > > Wouldn't mind seeing that one myself !
> > >
> > > Lyndon.
> > > ----- Original Message -----
> > > From: Daniel <bossute at iprimus.com.au>
> > > To: <gmecm at diy-efi.org>
> > > Sent: Saturday, July 14, 2001 5:49 AM
> > > Subject: Re: '749 questions
> > >
> > > > Chris any chance of a look at your bin , I want to check out how they
> are
> > > > getting around the barometric pressure check on start-up and WOT.
> > > >
> > > > Daniel Collins
> > > >
> > > > ----- Original Message -----
> > > > From: "Chris Rogers" <chrroger at hypermax.net.au>
> > > > To: <gmecm at diy-efi.org>
> > > > Sent: Saturday, July 14, 2001 6:10 PM
> > > > Subject: Re: '749 questions
> > > >
> > > >
> > > > > it will scale to a 2 bar item. that's what I have right now.
> resolution
> > > is
> > > > > reduced . 3 bar it will do but by extrapolation only ( beyond 2 bar)
> > > > > ----- Original Message -----
> > > > > From: "Programmer" <nwester at eidnet.org>
> > > > > To: <gmecm at diy-efi.org>
> > > > > Sent: Saturday, July 14, 2001 7:15 AM
> > > > > Subject: Re: '749 questions
> > > > >
> > > > >
> > > > > > Bruce was kind enough to sell me a couple cheaply--I've seen them
> as
> > > > > > low as $7.95 at a U-Pull-it yard. Sometimes you can bluff the
> sales
> > > > > > person at the counter on the other parts--just play stupid and
> you'd
> > > be
> > > > > > surprised at the prices. Since the '808 is MAP related--does
> anyone
> > > > > > know if it'd scale to a 2 or 3 bar MAP sensor ? Otherwise, with
> the
> > > > > > schematics--it's a pretty straight forward swap with the 1227749
> ecm.
> > > > > >
> > > > > > BTW--There's a guy in Calgary, AB runnin' a 780cc Rotax in a
> dragster
> > > > > > that's running low 10 second quarters (normally aspirated).
> > > > > >
> > > > > > Lyndon.
> > > > > > ----- Original Message -----
> > > > > > From: Chris Rogers <chrroger at hypermax.net.au>
> > > > > > To: <gmecm at diy-efi.org>
> > > > > > Sent: Friday, July 13, 2001 2:21 PM
> > > > > > Subject: '749 questions
> > > > > >
> > > > > >
> > > > > > > out of curiosity ( and yes I am a newbie) what are these units
> worth
> > > > > > > used. I like the idea of what you have done with the fiero and
> have
> > > a
> > > > > > > similar project on the go except mine
> > > > > > > is blown and is a 550cc subaru engine. I am currently using the
> '808
> > > > > > > (australian version of the '165) and want to control boost with
> the
> > > > ECU
> > > > > > > instead of mechanically. gearbox is a 5sp manual final gearing
> is
> > > > 4.44.
> > > > > > car
> > > > > > > weighs 1300 lbs dry. I currently have everything (bar injectors)
> > > from
> > > > > the
> > > > > > > original '808  system including the knock sensor board.
> > > > > > >
> > > > > > > thanks
> > > > > > > chris rogers
> > > > > > > brisbane Australia.
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > ----- Original Message -----
> > > > > > > From: "Programmer" <nwester at eidnet.org>
> > > > > > > To: <gmecm at diy-efi.org>
> > > > > > > Sent: Saturday, July 14, 2001 1:03 AM
> > > > > > > Subject: Re: '749 in Fiero
> > > > > > >
> > > > > > >
> > > > > > > > I'd better clarify a few things--I was the chip writer, info
> > > hander,
> > > > > > > > etc...the customer
> > > > > > > > did his own wiring and such. I'm on the 4th chip with him now.
> As
> > > > far
> > > > > as
> > > > > > I
> > > > > > > > know, he's
> > > > > > > > using a lot of the parts from a 2.0L Sunbird--but I'll nail
> him on
> > > > > > exactly
> > > > > > > > what he did. Yes,
> > > > > > > > it's dissy equipped.
> > > > > > > >
> > > > > > > > Lyndon.
> > > > > > > > ----- Original Message -----
> > > > > > > > From: <ECMnut at aol.com>
> > > > > > > > To: <gmecm at diy-efi.org>
> > > > > > > > Sent: Thursday, July 12, 2001 9:05 PM
> > > > > > > > Subject: Re: '749 in Fiero
> > > > > > > >
> > > > > > > >
> > > > > > > > > Nice work Lyndon!
> > > > > > > > >  I just got a 749 out of a 88 turbo GrandAm.
> > > > > > > > > Just itching to follow in your footstep with a boosted 4
> banger.
> > > > > > > > > Are you running a distributor? (sorry if it's a repeat
> > > question).
> > > > > > > > > If you say "coil pak", my questions are just getting
> started..
> > > > > <grin>
> > > > > > > > > Mike V
> > > > > > > > >
> > > > > > > > > In a message dated 7/12/01 10:06:42 AM Eastern Daylight
> Time,
> > > > > > > > > nwester at eidnet.org writes:
> > > > > > > > >
> > > > > > > > > > Guys--just wanted to report that a '749 project in a
> turbo'd
> > > > Fiero
> > > > > > is
> > > > > > > > > >  working good. We've got boost limited to 10 psi, idle is
> > > still
> > > > a
> > > > > > bit
> > > > > > > > weird,
> > > > > > > > > >  but otherwise it's using the basic syty bin with the
> injector
> > > > > > > constant
> > > > > > > > > >  changed. Manual trans with 2.8 V6...
> > > > > > > > > >  Apparently ran a 14.89 yesterday at the track with no
> further
> > > > > > tweaks.
> > > > > > > > > >  I'll have a full report of all mods later...
> > > > > > > > > >
> > > > > > > > > >  Lyndon.
> > > > > > > > > >
> > > > > > > >
> > > > > > >
> >

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