Re: Engine swap computer & wiring question

["Jeremy Gonyou" <jgonyou@hotmail.com>]

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.

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!

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).  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 ;)

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

Jeremy

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