DIY_EFI Digest V4 #605

Frederic Breitwieser frederic at xephic.dynip.com
Wed Oct 27 12:04:45 GMT 1999


David,

>  I am a complete boob when it comes to electronics, but I want to ask a couple of
> questions anyway.

Feel free :)

> 1. How many junkyard ecu options are there for a fangled port injected EFI system for a
> 511" twin turbo'd engine? [Sy/Ty only?]

Well, if you can change the fuel, timing, and other maps inside a
certain GM ECM, then that ECM is a good choice.  Nothing I did can't be
done on other ECMs... I just happen to have a lot of Syty ECM
information, and an awesome programmer that makes it much easier.  What
forced my choice on using this particular ECM were the tools... not the
ECM itself.  I'm not a EFI programmer, and the more the tools are
designed for "monkeys" the more I like them, being an EFI monkey myself
:)  THe limitation(s) of a particular ECM is the number of injectors,
type and quantity of sensors, and how it interprets the sensors.  A V8
engine can be run on many, many different ECMs.  I just chose the
1227749 syty ecm.

> 2. Can two throttle bodies be used with one ecu? [I need around 1000 cfm]

Yes, I did this.  I used two FWD 3.8L throttle bodies, one for each
turbo (I had them in a pile, what can I say!), and removed the throttle
plates and the "axle" they sit on, made a longer axle (metal rod), and
my friend spot welded two homemade throttle plates to the new rod.  Now,
they two throttle bodies are interconnected, thus allowing one gas pedal
to control two throttle bodies easily.  The FWD GM throttle bodies are
nothing more than a neck with one 2" or so disk that rotates on a shaft
- easy fangle.

> 3. If a fangled system is out for me, due to any reason, can the aftermarket Holley TBI
> systems be easily made to work with a blow through turbo deal?

Yes, absolutely.  From a fabrication standpoint pretend the holley TPI
is a carbeurator, make a plenum box above it, attach turbo hoses, and
crank away.  Might need a blow-off valve to relieve pressure if you are
at WOT and let off the gas suddenly, but that need would be on any
system.


-- 

Frederic Breitwieser
Xephic Technology
769 Sylvan Ave #9
Bridgeport CT 06606

Tele: (203) 372-2707
 Fax: (603) 372-1147
Web: http://xephic.dynip.com/



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