Holley 4D1

Clive Apps Techno-Logicals 416 510 0020 clive at problem.tantech.com
Thu Mar 4 18:19:50 GMT 1999


> 
> I had a 900cfm 4Di.  I just bought another one sunday.  They are great
> for power and tuneability.  I don't know about emmisions, but they
> should be just fine if tuned properly.  The injectors fire
> sequentially.  Yes, all 4.  One injector fires, then the next, and so
> on.


how tunable is this
also what approx cost are they going for used
I have a unique use for 1 
can you control which injector fires in which order or do they just cycle
around in a circle ( I guess I could switch wires around to get the firing order
I wanted)

Clive 

>
 
> Andy
> 
> 
> ---"Eric J. Lilleness" <eric.j.lilleness at boeing.com> wrote:
> >
> > I'm considering a Holley 4Di for a moderately built Ford 460, about
> 475 HP.
> > 
> > My main goal is passing emissions, but I would also like some of the
> other
> > features of EFI, such as not hitting 2500 RPM when I cold-start the
> damn thing
> > at 0530 to go to work.......
> > 
> > As an FYI, I had a shop to the actual motor R&R, but picked all the
> components
> > myself, as well as porting the heads, so feel free to send questions
> on big
> > Fords my way.
> > 
> > Questions:
> > 
> > (1) How will emissions on a Holley 4Di equipped engine compare to a
> factory EFI? 
> > 
> > (2) Is there a way to insure that (as an example) the front right
> injector
> > will always be the injector that fires during the #1 cylinder's
> intake stroke?
> > This would seem to require that the ECU "knows" what cylinder each
> ignition
> > pulse is intended for.
> >  
> > (3) If the answer to the above is "no", will emissions be about the
> same as, 
> > or worse than batch-fired port injection? 
> >  
> > (4) Is the timing of the injector firing progammable in a manner
> similar to 
> > ignition advance varying as a function of RPM? 
> >  
> > (5) Iv'e heard a few love/hate stories on Holley EFI; but how are
> their
> > current products, especially the 4Di?
> > 
> > 		Thanks, Eric
> > 
> 
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