[Gmecm] Tri Power EFI

[Bobby Morgan]

Do some research on early eighty's Indy Camaro Pacecar that used two tbi
units.




-----Original Message-----
From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org] On Behalf
Of David Haggard
Sent: Monday, March 28, 2005 6:16 AM
To: hh7x at verizon.net; gmecm at diy-efi.org
Subject: RE: [Gmecm] Tri Power EFI

Cadillac 4.1 litre TBI from late 80's. This TBI doesn't use an IAC motor for
idle speed. It uses an external throttle positioner that (I think) can be
wired to use the IAC circuits.

You'll have to include some sort of micro switch on the linkage to cut off
the front and back injectors for normal cruise. And I think the injectors
need to be wired in series in order to work.

The REAL tuning trick as I see it will be to get the front and back
injectors to start firing immediately when their throttle plates start to
open, AND get the mixtures right accordingly. 

Unless you want to have all three open together all the time. But that will
make your low-end tuning difficult and boggy.

If it were me, I'd go with the original 3 deuces carburetor setup and use
the ECM for spark only. Use a heated O2 sensor as a tuning device to fine
tune the carbs for best mixtures.

By the way, is it also a 389? It ain't really right if it ain't a 389.

;~)

David Haggard
   '88 Formula Firebird "SR-71 Black 'Bird"


> 
> Ok knuckle draggers -
> 
> I've my '66 Pontiac that is
> time to save .
> 
> 
> 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.
>          NEW YORK
>    eagle registry #501
> eagle kammback registry
>              Brien.
>          NEW YORK
>    eagle registry #501
> eagle kammback registry
> _______________________________________________
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