Re: Engine swap computer & wiring question

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

> Hi Tim,
>
> I read what everbody else has to say about this - and since I have a soft
> spot for the GTs - I'm gonna throw in my two cents.

Me too... I don't know what it is about this darn car.  should have been
declared totalled and hauled to a junkyard.  I finally got it fixed, and
drove it to work today for the first time in 3 years since the accident.
It's good to drive it again.

>
> First of all, you made an statement about the similarities of the engines,
> which Bruce called you on.  I think you're right, it *must* be possible,
but
> the little things that you don't see coming *will* screw you up.  For
> instance, if going to 5-spd, you'll need to get new motor mounts or your
> drivetrain will be crooked!

Yep, I need to research all the little things as much as possible.  I won't
be using the getrag or the isuzu 5 speed though.  I'll keep the 125C
automatic.


>
> As for your actual question, I think the general concensus around here is
to
> stay as far away from OBD as possible.  It'll cause you a boatload of
> problems and the seqential fire really won't buy you a whole lot.  So...
>
> Having considered this swap myself, I decided that the best thing to do
> would be to use the wiring and ECM for a 3.1 (7730).  Because the 3.4 is
> basicaly a bored 3.1 you should be able to keep the wiring close to stock.
> The cal will be close (closer than 2.8 anyway).

These are about my thoughts as well.  The .3 liters of displacement isn't
that much.  But even if I use the 2.8 computer... .6 is a difference.. but
it's not TERRIBLY different when you consider that the engines for all
practical purposes are the same.  I can get the 3.1 wiring for a '92 or
newer Sunbird, but I would then have to change my dash.  The cimarron wiring
was attractive because I could then keep my existing dash.

  The 7730 is pretty well
> known around here and you should be able to get help with the software.  I
> have done some work on the V6 code and know that a few others have too.
So
> with a little diligence, accomodating .3 liters and better head flow
> shouldn't be a problem.   Running a Getrag 5-spd with OBD II, however,
> sounds pretty scary.  Uh, you are doing 5-spd right?  'Cause I hate to see
> you do all this work for nothing ;)

I agree 100%.  I would rather stay away from OBDII.  You know... I really
dont' mind the automatic.  I considered the 4-speed auto, but decided
against it.  I do, however have a shift kit for my existing tranny sitting
on a shelf at home.  It should help at least some.

>
> Oh, one more thing.  The 7730 is good, also, for when you turbocharge that
> guy!

That actually was a long-term idea that I had. I'm just waiting for GM to
begin puting the Eaton Superchargers on the cars at the factory.  I would
rather have a supercharger than a turbo... I hate the lag.  I love instant
acceleration out of the hole, and a supercharger can provide this.

I need to go now... I will reply to all the other messages later.  Thanks
all for the help.

-Tim
www.sunbirdconvertible.com


> Jeremy


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