Edelbrock TBI conversion to PI

[jweir at att.net]

I've got a copy of the chip from Edelbrock, I called and 
asked and they sent me a copy, it just took a little 
story but anyway let me know if anyone wants a copy, I 
can post it to the FTP site/my web site or send it 
privatly

Jason Weir

--
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
CNC 4X4 Member - http://cnc.4x4.org/
			
			
> David Sagers wrote:
> > 
> > Last night I was looking thru the new Jeg’s catalog and saw the Edelbrock
> > kit for converting a GM TBI to a port injection system, includes manifold,
> > injectors, fuel pump...
> > 
> > The description says that it uses the TBI computer.  Now Edelbrock makes
> > some fine intake manifolds, but the total cost on the kit is some $1100.
> > 
> > Since I already own most of the parts for a TPI intake, I am  wondering how
> > to make the TBI computer for my ‘92 SBC Suburban fire all eight injectors if
> > I install the TPI.  Is it as simple as a harness that plugs into the
> > existing TBI harness or is there more to it?
> > 
> > Seems that a computer designed to drive two TBI injectors would lack
> > something necessary to drive eight TPI injectors, maybe that’s why the kit
> > is $1,000.
> > 
> > What else to I need to change to make the TPI conversion?  Would I be better
> > off buying the Painless Wiring harness and using a TPI computer instead of
> > the TBI computer?
> 
> There might be some information in the archives, I've looked into this
> a little.  Edelbrock uses a stock ECM, but they will send a new Eprom. 
> There isn't much changed in their calibration from the factory cal's
> I've looked at. These were for the 91 and older 747 ecm.  
>  I was told the injectors plug into the factory harness.  They are
> driven by
> the stock injector drivers.  I suspect they are the same as the
> parts used in the Pro-flo system.  I was told the Pro-flo injectors
> are Marelli units, and measure 17 ohms each.  If I remember the
> formula, that should work out to around 4 1/4 ohms/bank of 4.  What is
> the resistance of the TBI injectors? 
> 
> Fuel pump from a pfi vehicle should be sufficient for the conversion.
> Edelbrock tech help has been somewhat friendly to a couple of people
> I've spoken with, so you might give them a call.  
> 
> I'd use a complete TPI setup, including the ECM.  I really think the
> long runner TPI manifold should be used in the trucks.  If it were
> combined with a Crane Compucam designed for torque, that would make a
> really strong tow vehicle.
> Shannen
>