[Diy_efi] 93 pontiac grand prix... I think the 3.1L auto

Sat Aug 12 02:57:19 UTC 2006

Good story.  Lesson for all.  Thanks.

-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On
Behalf Of Lee M. Lemoine
Sent: Friday, August 11, 2006 9:44 AM
To: diy_efi at diy-efi.org
Subject: Re: [Diy_efi] 93 pontiac grand prix... I think the 3.1L auto

Hey Joe,

Well, me and my friend were out tuning without a wideband...   (Not that it
would have helped what actually happened)...   Anyways, with the haltech
your RPM limit is set in a menu, i set mine to 5500 rpm (stock) and only
programmed fuel up to the 5500 rpm table.  When my friend (who also monitors
these threads) Keith was using my laptop, he somehow enabled the 6000 rpm
table, which had no fuel mapped to it -- so it raised the ECMs rev limiter
automatically to 6000 rpm.

What happened was i was making powerband runs from 3200 rpm thru redline,
and the ignition cut at redline was working just fine -- until the redline
got moved.  Then the ECM started leaning out the mixture (eventually to
ZERO!)  every RPM up after 5500 -- with 14.5 psi boost running through the
motor, its no wonder why there are quarter size holes in the piston (I'm
just guessing, it still runs, but lopes worse than anything i've ever seen
-- and it has 'crankcase backfires' as i call them.   One of them strong
enough to blow the breather off, as well as push the oil dipstick and launch
it halfway across the yard (good 150 feet)...   either way, i got the new
motor just gotta clean it up and swap some stuff over, then make a new
wiring harness because i'm sick of having 400,000 dead end wires.

-- Lee

On 8/11/06, Joe Boucher <boucherj at prodigy.net> wrote:
>
> So what happened to the motor?  Too aggressive on the timing?  Go too lean
> at max boast?
>
> Teach us O-Great-One-Who-Pushed-the-Boundaries.  But sadly a bit too far.
>
> There is a Pic-n-Pull near me which had TWO of the quad over head cam
> V-6's
> for $139.95 a piece, with three accessories.  I went back last weekend and
> the entire cars were gone.
>
> Still scratching my head about that one.
>
> Joe B.
>
> -----Original Message-----
> From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On
> Behalf Of Lee M. Lemoine
> Sent: Tuesday, August 08, 2006 1:18 PM
> To: diy_efi at diy-efi.org
> Subject: Re: [Diy_efi] 93 pontiac grand prix... I think the 3.1L auto
>
>
> Hey Jim,
>
> The 3.1 is a pretty versatile motor -- depending upon what application
> your
> removing it from (in your case, a W-body) it'll have a 127727 ECM -- very
> modifiable.  I personally have a Mclaren 3.1 turbo which is essentially
> the
> same block with a little different casting (oil returns, different oil
> distribution system) -- and am running a haltech E6GM re-wired to work
> with
> this engine...  If i had known that three years later there'd be as much
> "plug and play" stuff out for the 3.1, i'd certainly have waited.
>
> I'm sure there are many programs out there, GMECM seems neat, although i
> haven't used it to do more than obtain the base timing tables for the
> 3.1turbo maps... (so i can program them into my haltech for base
> tuning)
> however, it does support romulation -- running code off of a virtual
> "prom"
> so that you can change values in real time...   Sounds maybe more like
> what
> you may want to get into -- and those can be had for about $200 or so.
>
> The stock ECM will be pretty quick to respond -- even to mild motors..
> Mine's got (okay, HAD... before i melted my pistons) a pretty wild cam, a
> ton of headwork, and the stock (for the mclaren) mahle low compression
> pistons...
>
> Let me know if there is anything you may need some help with, i actually
> picked up my 6th 3.1 yesterday, and plan to rebuild it to replace the
> mclaren block currently in my vehicle.
>
> -- Lee
>
> On 8/8/06, Jim Butterfield <jimbutterfield at yahoo.com> wrote:
> >
> > Hi all,
> >   I mostly work with ODBII type pontiacs, so im unfamilar... a buddy is
> > wanting to take the eng trans from a 93 GP and use it in a sand rail...
> what
> > type of computer does this have and how programable is it??? He will
> want
> to
> > work the engine a little with a cam headers and even maybe some head
> work,
> > so the VE for the speed density system will be a bit out of wack im
> sure....
> > any help is appreciated... I will be searching some of the w-body/grand
> am
> /
> > N-body sites as well for info, but was curious what this group has...
> >
> >   thx
> >   jim
> >
> >
> >
> > ---------------------------------
> > Do you Yahoo!?
> > Everyone is raving about the  all-new Yahoo! Mail Beta.
> > _______________________________________________
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> >
>
>
>
> --
> Sincerely,
> Lee M. Lemoine
> KB1NQI  - Amateur Radio
> http://www.turbochargedsoul.com/
> '06 Subaru Legacy GT Limited - 250/250 AWD 5EAT
> '93 Chevy Cavalier Z24 Convertible - 300/330 FWD 5MT (Mclaren Turbo!)
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--
Sincerely,
Lee M. Lemoine
KB1NQI  - Amateur Radio
http://www.turbochargedsoul.com/
'06 Subaru Legacy GT Limited - 250/250 AWD 5EAT
'93 Chevy Cavalier Z24 Convertible - 300/330 FWD 5MT (Mclaren Turbo!)
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