Edelbrock TBI Conversion

[Jason Weir]

Ok now that all this talk about the 7747 Edelbrock TBI to TPI conversion
going on.  I got a few questions for those with some EE background... 
Hang with me here while I talk out loud..

TBI

1 injector fires for every cylinder firing.
8 cylinders firing means 8 injector events, alternating 4 per injector


Edelbrock 7747 TPI Setup

1 injector fires for every 4 cylinders firing
8 cylinders firing means 2 injector events. 2 groups of 4 alternating


So my question did Edelbrock just put a divide by 2 after each original
TBI driver and use that to trigger a secondary driver that fed the
injector groups?  This is the only way that I can see how they might
have made it work?  Any other ideas..

This brings up my application question.  When we are dealing with a V8
things are easy its a divide by 2.. But what if I wanted to do the same
thing on a 6 cylinder?  Now I have 6 injector events that I need to turn
into 2.  Its not as easy to make a divide by 3.  Has anyone heard of a
chip that could do this.. Customizable to do a divide by x, with just
jumping pins or resistance to pins or whatever.

Any ideas???

BTW I am running a TBI right now but I've got the Multi-Port manifold
just waiting till I can get the electronics figured out..  I know I
could just swap the ECM to a V6 TPI computer but thats the easy way and
them I have to learn a new ECM all over again, just when I almost have
my 7747 setup running great.


Jason
-- 
88 Wrangler - 155K miles and counting
258 I6, 4.0 head, Cherokee header, 2 1/2 exhaust with high flow cat &
Flowmaster
GM TBI, Crane 260H Cam
TJ Fender Flares
http://home.att.net/~jweir
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