Holley 4D1

[andy quaas]

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.

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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