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Re: Engine swap computer & wiring question



unfortunately, no... it was a 3400 OHV.  not the same as the OHC (thank God)

Tim De Coster
'89 Z24 Conv.
'88 Sunbird GT Conv.
'98 Intrepid
www.sunbirdconvertible.com


----- Original Message -----
From: "Programmer" <nwester@eidnet.org>
To: <gmecm@diy-efi.org>
Sent: Wednesday, July 12, 2000 8:40 PM
Subject: Re: Engine swap computer & wiring question


> Didn't the early 90's Z34 run a 3.4L DOHC OBD1 ??
>
> -----Original Message-----
> From: Tim De Coster <craz1@softhome.net>
> To: gmecm@diy-efi.org <gmecm@diy-efi.org>
> Date: July 12, 2000 2:39 PM
> Subject: Re: Engine swap computer & wiring question
>
>
> >See below for comments:
> >
> >> Can you get a 3.4L computer that's not OBD2?  If you look at
> >> www.cruzers.com/~ludis you can probably get a non OBD2 ECM part number.
> >
> >No, to my knowledge there are no applications where a 3400 was ever run
by
> >an OBD1 computer.  After looking at that website, it came to me that the
> >Beretta had the 3100 in '94 *I think*, and there was a number for '93-'96
> >3.1 with SFI.  This tuning would be more likely to work with the 3400,
> >because on the 3100 and 3400, literally the only difference is the
> >displacement.  Both were SFI.  This may be a possibility.  I'm not sure,
> >however, if the EPROM from this Beretta would fit right into my existing
> >computer or if I would have to get the entire Beretta computer.
> >
> >>
> >> > control this new engine if I get a new EPROM module for it?  I
already
> >have
> >> > one from a '91 Z24 (It had a 3.1 v6), and I am hoping that it will
> work.
> >It
> >> > may because the 3.4 is basically the same exact engine as the 2.8,
> >except it
> >> > has revised heads, among a few other things.
> >>
> >> Larger displacement also.  Is the 3.1L ECM the same as your 2.8 ECM?
> >> same type trans? same type VSS?  BL can probably stretch to cover the
> >> increased displacement but you'd rather have a 3.4L calibration.
> >> replacing memcals etc. is all about tuning, so if you want a tuning
> >> project in addition to a swap project then you can try it.  I think the
> >> least risk path is to find a 3.4L ECM that will work.  Either the OBD2
> >> one, if you can dummy up some O2 sensors and whatever else it wants, or
> >> a non-OBD2 3.4L ECM that matches what you have option wise as close as
> >> possible (trans type, VSS, etc.)  If the 3.4 ECM is the same part # as
> >> your existing 2.8L ECM then I guess you can get away with just a 3.4L
> >> cal in your 2.8L ECM.
> >
> >The 2.8 and 3.1 MPFI version engines are identical other than
displacement
> >(different crank and connecting rods).  I know people who have changed to
a
> >3.1 from a 2.8 without touching the computer.  One of my concerns with
the
> >OBDII computers is compatibility with  my dash, and another is the
> PASSKEYII
> >systems that they seem to be intertwined with.
> >>
> >> >
> >> > I know that the Cadillac Cimarron's digital dash does talk to the
ECM,
> >> > because I was going to put the Cimarron digital dash into my
Sunbird...
> >> > until I found that most of the info. for the gauges goes through the
> ECM
> >> > before it gets to the dash.  This probably would mean that the
Cimarron
> >> > wiring idea is out of consideration, right?  The only reason I
thought
> >of it
> >> > was because the dash is physically the same in it, and it has a 2.8
> mpfi
> >v6
> >> > engine.
> >>
> >> Cimarron dash would require a Cimarron ECM for the gauges to work.
> >> Cimarron ECM is 2.8L only?  Getting a Cimarron dash, ECM, wiring etc.
> >> would swap in nicely (assuming you can make the dash stuff fit), but
now
> >> you've got some calibration work probably to make it work right.  Your
> >> displacement is 20% more now.
> >
> >Yep, I would get the whole works.  The Sunbird and Cimarron dashes have
the
> >same openings, mount the same way... everything.  The '87-'88 Cimarron
> >dashes are 2.8 only.  They stopped the Cimarron in '88 (thank God).
> >>
> >> Personally, I'd leave the digital dash project for stage 2, and get the
> >> car going now w/some kind of 3.4L ECM
> >
> >he hee... I already sold that digital dash.  I want no part of it : )
> >
> >
> >Tim De Coster
> >'89 Z24 Conv.
> >'88 Sunbird GT Conv.
> >'98 Intrepid
> >www.sunbirdconvertible.com
> >
> >
> >
>
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