Netres availability

[Shannen Durphey]

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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