[Gmecm] Tri Power EFI

[Markus A Lien]

Bobby Morgan had the right idea when he suggested looking at the crossfire
injection system.  I am in the midst of putting one on my 66 impala and have
spent a ton of time on the crossfire injection group.

The TBI's used on the crossfire are single barrel with a single injector
nozzle.  The two TBI's are not progressivly linked but because they are
smaller units with only one nozzle each the two of them act like one
standard TBI.  The IAC's are wired in parrallel and only one of the TBI's
has a TPS.  The only tuning weirdness is the initial IAC numbers need to be
cut in half because there are two IAC's.

My suggestion for the Tri Power EFI would be to take 3 standard TBI's and
replace all 6 nozzle's with smaller ones (or just disable one nozzle in each
TBI).  Set the linkage up non progressivly.  Remove 2 of the TPS's.
Parallel connect all 3 IAC's and start tuning.

If this is going on a bigger engine like a 389 then 3 TBI's with one 305
nozzle each would be pretty reasonable starting point.  The only radical
tuning adjustment needed would be to divide the initial IAC steps by 3.

I think having 3 TBI's sitting on top of a short  tunnel ram type intake
would look seriously cool, sometimes looking good is just as important as
working good.


            Markus
----- Original Message ----- 
From: <bcroe at juno.com>
To: <gmecm at diy-efi.org>
Sent: Monday, March 28, 2005 5:29 PM
Subject: [Gmecm] Tri Power EFI


> Putting a switch on a throttle body injector is totally
> unworkable.  Your fuel would double when all
> throttle bodies opened, and your ECM wouldn't even
> know it or be able to compensate till the O2 sensor
> started feeding back.  In the mean time you have a
> monster bog, and/or big lean going the other way.
>
> Port injection avoids these problems.  Sequential is
> optional, with some pluses.  For one, you can get
> more fuel out of a given size injector.
>
> Bruce (sequential injection 79 Eldo 403) Roe
>
> 28 Mar 2005 "Brien Tourville" <hh7x at verizon.net> writes:
> >
> > No insistence on throttle body injection -
> > Sequential Port Injection is on the Table.
> >
> > Would I Partition the interior of the manifold
> > with two walls - and use three separate systems
> > running 2 / 4 / 2 on port grouping front to back
> > with three throttle bodies and three seperate
> > ECMs coupled by throttle cable >?
> >
> > -or-
> >
> > keep the port injection & use three dummy / empty
> > carbs and construct a single  'Air Cleaner' assembly
> > with a TPI  throttle body in the front ?
>
> > From:           "Bobby Morgan" <rosankyauto at austin.rr.com>
> > Subject:        RE: [Gmecm] Tri Power EFI
> > To:             <gmecm at diy-efi.org>, <hh7x at verizon.net>
> >
> > If you insist on tbi units and progressive linkage use
> > a micro switchto turn the injectors on and off for the
> > inboard and outboard tbi unit.  This should save fuel
> > unless your foot is on the floor which it will be.
>
> > -----Original Message-----
> > From: gmecm-bounces at diy-efi.org
> >  On Behalf Of bcroe at juno.com  Sun, Mar 27, 2005
>
> > You are doing port injection?  I don't see another way to
> > do it with any progressive linkage throttle body.
> >
> > Bruce Roe
> >
> > 27 Mar 2005 "Brien Tourville" <hh7x at verizon.net> writes:
> >
> > > I'd like to use the Aluminum Tri-Power intake manifold in
> > > an EFi set up - to celebrate 'Three Dueces and a 4-speed'
> > >
> > > Three TB units out of ? Saab ?  Yugo ?
> > >
> > > Any Build Suggestions  welcomed !
> >
> > >              Brien
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