[Gmecm] Buick 3300 LG7 MAF Program...

Mon Nov 12 23:16:25 UTC 2012

Hi there!

Depending on the transmission in the Fiero you may be in luck.  The Getrag
282 5-speed in FWD cars 1991-1994 (I think, maybe 1992?) I think had the
magnetic VSS.  It's been a while since I owned one but I think that's the
case.  So, that may work on the Fiero.

Jags That Run have offered inline VSS modules before, which may work on the
Lotus.

Jay Vessels
1982 Chevrolet S-10 Sport, 2.8V6 TBI
2006 Pontiac Solstice
2007 Subaru Outback L.L. Bean, 3.0R

On Mon, Nov 12, 2012 at 6:11 PM, <dozierhc at aol.com> wrote:

> Robert...
>
> I can scavange an SRAM IC from a 16149396 (I have a couple) and install if
> needed.  I guess maybe a better way is to use MonteCarSlow's (Moates) NVRAM
> setup if needed.
>
> I don't think the missing quad driver is an issue, but could populate that
> as well in the 749 ECM.
>
> As for the Europa, the VRS pulses per rev (2 per engine revolution) would
> come from a crank trigger setup, and the IAC would be a GM pintle stepper
> motor type mounted onto the throttle body bypass.
> The engine itself has individual throttle bodies, but a plenum over them
> that leads to at present a vane air meter.  I really would like both a MAF
> and MAP type setup for it..  IAT and CTS are easy.  Use GM sensors.
>
> Both engines are only 1bar (normally aspirated), so no need for 3bar MAP
> sensor, and both are manual transmissions.
>
> The Fiero VSS and a VSS for my Europa are probably going to require some
> thinking, as I think neither of us has the 4k mag setup that most later GM
> cars use.
>
> Hank
>  -----Original Message-----
> From: Robert Saar <robertisaar at yahoo.com>
> To: gmecm <gmecm at diy-efi.org>
> Sent: Mon, Nov 12, 2012 5:38 pm
> Subject: Re: [Gmecm] Buick 3300 LG7 MAF Program...
>
>  the duke with a dizzy or the later DIS system would be fine, assuming
> the injectors are compatible.
>
> the 7749.... compared to a 7730 is missing a quad driver(i forget which),
> so you'll lose 4 outputs. assuming you don't need them, it's a non-issue.
> it also doesn't have the extra SRAM of a 16149396, so anything utilizing
> the extra RAM also cannot be dealt with unless you are skilled enough with
> SMD soldering to integrate it in there. for that matter, you could also add
> in the missing quad driver and basically have a non-underhood 16149396 with
> a second injector driver.
>
> stuff REQUIRING the extra SRAM are currently:
>
> 4 circuit PRNDL decoder
> TCC PWM
> transmission temp sensor
> 3BAR MAP items
>
> everything else should run just fine in a normal 7727/7730 and the 7749 so
> long as specific outputs aren't trying to be used.
>
>
> i know nothing about Lotus Europas, so i can't really comment on what will
> and won't work beyond "does it generate the correct signals and are the
> driven components compatible?".
>
> --- On *Mon, 11/12/12, dozierhc at aol.com <dozierhc at aol.com>* wrote:
>
>
> From: dozierhc at aol.com <dozierhc at aol.com>
> Subject: Re: [Gmecm] Buick 3300 LG7 MAF Program...
> To: gmecm at diy-efi.org
> Date: Monday, November 12, 2012, 5:11 PM
>
>  Robert......
>
> I was thinking about at least a friend's Fiero. He has one of those rare
> DOHC head conversions of the Patty Duke that he got a while ago when
> Pontiac made them.  That engine could run either the GM waste spark setup
> or possibly a distributor.
>
> I also myself have a non-GM application in a Lotus Europa.
>
> Both engines are capable of 7500 rpm, and the ECM I was thinking of using
> would be a 1227749 version (has two injector drivers and can run 4 low-Z
> injectors).
>
> Hank
>  -----Original Message-----
> From: Robert Saar <robertisaar at yahoo.com>
> To: gmecm <gmecm at diy-efi.org>
> Sent: Mon, Nov 12, 2012 5:03 pm
> Subject: Re: [Gmecm] Buick 3300 LG7 MAF Program...
>
>    as long as the ICM/distributor creates a 2X signal(for a 4 cylinder,
> 3X for 6, 4X for 8), then i don't see any reason why it wouldn't. just
> don't try natively driving more than a single low-impedance injector or up
> to 8 high-impedance injectors on an unmodified PCM. the injector driver's
> don't like that at all.
>
> what 4 cylinder do you have in mind? the only one i can think of that this
> excludes would be the quad4 due to the injectors, though i may have an
> acceptable workaround for that other than outright replacing the injectors.
>
> --- On *Mon, 11/12/12, dozierhc at aol.com<http://us.mc451.mail.yahoo.com/mc/compose?to=dozierhc at aol.com>
> <dozierhc at aol.com<http://us.mc451.mail.yahoo.com/mc/compose?to=dozierhc at aol.com>
> >* wrote:
>
>
> From: dozierhc at aol.com<http://us.mc451.mail.yahoo.com/mc/compose?to=dozierhc at aol.com><
> dozierhc at aol.com<http://us.mc451.mail.yahoo.com/mc/compose?to=dozierhc at aol.com>
> >
> Subject: Re: [Gmecm] Buick 3300 LG7 MAF Program...
> To: gmecm at diy-efi.org<http://us.mc451.mail.yahoo.com/mc/compose?to=gmecm at diy-efi.org>
> Date: Monday, November 12, 2012, 11:24 AM
>
>  Robert...
>
> Can your nAst1 code work with a four-cylinder, or is it hard-coded for
> only the V6 (60 degree) GM engines.
> Some of the modifications you have done, especially the VE and MAF seem to
> be ideal for running on a four cylinder engine.
>
> Thanks,
>
> Hank
>  -----Original Message-----
> From: Robert Saar <robertisaar at yahoo.com<http://us.mc451.mail.yahoo.com/mc/compose?to=robertisaar at yahoo.com>
> >
> To: gmecm <gmecm at diy-efi.org<http://us.mc451.mail.yahoo.com/mc/compose?to=gmecm at diy-efi.org>
> >
> Sent: Sat, Nov 10, 2012 8:41 pm
> Subject: Re: [Gmecm] Buick 3300 LG7 MAF Program...
>
>    and here's the quick run-through of the MAF HZ calculation.
>
> 3FC6 (only used in this subroutine) - no actual purpose other than to grab
> value and compare it to itself to see if 3FF8 should be grabbed again
> 3FF8 (only used in this subroutine) - stored to AA
> double byte 11A - old AA value. gets loaded, then inverted via NEGA/NEGB,
> A rounded, then AA added to it, then stored to AE
> double byte AA - current 3FF8 value. copied to 11A(delta?).
> double byte AE - is AA + inverted 11A
> double byte 11C - old AC value. loaded, inverted, A rounded, AC added,
> compared, then divide with AE
> double byte AC - current 3FC6 value. copied to 11C(delta?).
>
>
> 11C is inverted, then AC is added to it, compared against a few values,
> then the divide with AE, creates 16-bit Hz X 1
>
>
>
> now, the two big hardware locations are 3FC6 and 3FF8, both of which i've
> noticed in A1 already, so that's good news. in the 2E hack, 3FC6 is noted
> as "PA2 counter", so it is a pulse accumulator. it now makes sense how all
> of these values are intertwined. 3FF8 is also used in 2E in basically the
> same manner as well. the 2E PCM(used in 94-95 3.4DOHC W-bodies is basically
> an underhood version of the 94-95 3100 A-Body PCM) is also a P4 unit, so
> all of this is checking out quite well.
>
> also, the AE XDF that is floating around on the internet? it's not quite
> accurate.... not sure where it came from, but from the couple of things
> i've specifically looked at, there are some changes that need made to be
> correct. the MAF tables were one of them. $AE is limited to 256 grams/sec
> (2E is limited to 512 grams/sec due to having a MAF table scalar and
> offset).
>
> --- On *Sat, 11/10/12, David Allen <davida1 at hiwaay.net<http://us.mc451.mail.yahoo.com/mc/compose?to=davida1 at hiwaay.net>
> >* wrote:
>
>
> From: David Allen <davida1 at hiwaay.net<http://us.mc451.mail.yahoo.com/mc/compose?to=davida1 at hiwaay.net>
> >
> Subject: [Gmecm] Buick 3300 LG7 MAF Program...
> To: "David Allen" <davida1 at hiwaay.net<http://us.mc451.mail.yahoo.com/mc/compose?to=davida1 at hiwaay.net>>,
> robertissar at yahoo.com<http://us.mc451.mail.yahoo.com/mc/compose?to=robertissar at yahoo.com>,
> "GM-ECM" <gmecm at diy-efi.org<http://us.mc451.mail.yahoo.com/mc/compose?to=gmecm at diy-efi.org>
> >
> Date: Saturday, November 10, 2012, 11:29 AM
>
> Hi Robert. Attached are 2 .bin files. My chip reader wouldn't auto-detect
> the chip size, so I read it as a 27C256 and as a 27C512. If these are not
> usable I can adjust and read it again. Normally it auto detects the chip
> size, so I hope this doesn't mean the chip was corrupt or damaged.
>
> This MEMCAL (AXAT 9713) was installed in the 8706 ECM I got from junkyard
> from a 90's Cutlass Ciera 3300 car.
>
> Hope this helps you to improve your nAst1 code MAF function! Will be
> interested to hear what you find.
>
> Sincerely,
> David
>
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>
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