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[ae2598 at wayne.edu]

I was about to mention that if the '727 can't drive a single injector in a
4-cyl TBI application, that I might have to walk home from work tonight..
:)  It seemed to get me here OK, and I can't say that I've ever noticed a
pool of petrol under the throttle bodies I've removed in the past!


 On Tue, 21 Aug 2001, Shannen Durphey wrote:

> The 1227730 works perfectly with tbi.  The 1227727, electronically the same ecm,
> is factory supplied in 90-92 2.5l TBI Luminas.
> 
> Shannen
> 
> WEG1192 at aol.com wrote:
> > 
> > In a message dated 8/20/2001 11:55:47 PM Eastern Daylight Time,
> > nwester at eidnet.org writes:
> > 
> > > If this TBI is just spraying into the bottom of the manifold anyways--is it
> > >  really going to matter ?? I've seen some virtual fuel "pools" at the bottom
> > >  of some 2.0L TBI stuff--and it seems to still work. If both injector
> > drivers
> > >  went to a "single injector"--would that make a big difference ??
> > >
> > >  Lyndon
> > 
> > I have researched the archives for TBI applications of the 7730 ECM, and it
> > appears that although it will work, it won't work well. To me, this is due to
> > the batch firing of one injector driver. If fuel pooling at the bottom of the
> > manifold really was an acceptable way of running the engine, I would think
> > the 7730 would work ok, which it doesn't per the archives. Again, it all
> > boils down to distribution of the air fuel mixture to all cylinders evenly
> > for a smooth running engine, and the batch fire stuff only works on port EFI
> > where the backwards flow of fuel and air from one runner to another is not
> > very likely. Since TBI applications inject fuel way before the runners split
> > up and go to the cylinders, the majority of the fuel squirt is going to go to
> > whichever cylinder's intake opens right after the fuel squirt. Now at higher
> > RPMs it may be that the fuel squirt duration lasts long enough for more than
> > one cylinder to get an adequate fuel shot. So if you find that the engine
> > runs better at high RPM with a batch fire ECM and TBI, this would verify my
> > position. Even though the engine may not be getting an evenly distributed
> > fuel air shot at lower RPMs, the power demand on the engine may not require
> > that anyway. But I can't believe the engine would run with acceptable
> > emissions this way.
> > 
> > Maybe he should try a 7730 with a 4 cylinder engine and use the $8D mask with
> > the cyinder select set to 4 cylinders. This is a known hacked ECM. I think
> > Chet Wagner has done this and he says it works well. JW
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> 


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