Re: Engine swap computer & wiring question (& 3800SC)

["Tim De Coster" <craz1@softhome.net>]

Yeah, that is kind of what I was hoping to do... keep most of the 3400
components and use mostly the 3.1 wiring, just splicing in the 3400 engine
wiring where necessary.

You say that a lot of Fiero owners have done the upgrade to 3400.  Do you
know of any in particular (with email) who would be willing to talk to me a
little about this?  In particular, I am most interested in cars with mostly
3400 components.  I would like to keep the 3400 heads because they have
rollers, and if I keep the heads I would need to keep the intake as well.
Were the Fiero owners doing their re-calibrating, or buying the chips from
someone.  I don't have the equipment or know-how to program a chip myself...

Another idea for this swap... instead of using the 3400, I am again thinking
of the 3800 supercharged, like I originally was.  My planning turned from
the 3800 to the 3400 because of figuring out how to physically mount the
engine.  I'm considering the 3800 again because of ease of wiring.  Anyone
know if the early '92 or '93 Bonneviles with the SC 3.8 were OBDII?   If so,
would that run a late 90's or perhaps a 2000-'01 engine?  Do these computers
care what transmission is used?  I will keep my 3T40 most likely. The newer
3800's (GenII) had a considerable amount more HP than the older ones.

As you can see... I'm in the very early planning stages here.  Since I just
recently bought a '98 Intrepid to repair and sell within the next month and
a half, the swap might pushed off until next summer.

Thanks,
Tim De Coster
'89 Z24 Conv.
'88 Sunbird GT Conv.
www.sunbirdconvertible.com



----- Original Message -----
From: "Ludis Langens" <ludis@cruzers.com>
To: <gmecm@diy-efi.org>
Sent: Thursday, July 13, 2000 4:33 AM
Subject: Re: Engine swap computer & wiring question


> steve ravet wrote:
> >
> > Can you get a 3.4L computer that's not OBD2?
>
> There is no such thing.  Further, I don't think there is non-flash
> non-OBDII ECM for the "3100" either.
>
> > 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.
>
> Lots of Fiero owners have upgraded the 2.8 to 3.1 or even 3.4.  The
> usual way is to use a 3.1 or 3.4 short block and swap all the 2.8
> components onto it.  The old Fiero ECM handles the switch to 3.1 just
> fine.  The 2.8->3.4 switch requires different injectors and/or fuel
> pressure and/or a recalibrated chip.
>
> You might be able to do something similar by starting with a Gen II 3.1
> setup and slipping the 3400 underneath it.  One thing to consider, the
> 3100 & 3400 blocks have timing cover designs that are incompatible with
> the old Gen I and Gen II blocks.  I don't know if you could use the old
> 3.1 ECM & sensors on an almost complete 3400 - the different intake will
> probably throw the calibration way off.

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