[DeTomaso] Hp difference between efi and webers

[wkooiman at earthlink.net]

By the way, stock 48IDA webers are 48mm, but that doesn't include the chokes.

I have 42mm chokes.  Stock is 37mm.

The throttle bodies for EFI have no chokes, plus they don't have a booster venturi, so they'll flow gobs of air.  They're also flowing air only.  The fuel is injected below the butterflies.  I'm not sure how much that matters with respect to airflow.

You can also run 58mm webers or 58mm throttle bodies if you're really worried, but by my calculations, 42mm is plenty - at least for my build.

Will.

-----Original Message-----
>From: Paul - Home <thedrol at pobox.com>
>Sent: Oct 29, 2008 11:23 AM
>To: detomaso at realbig.com
>Subject: Re: [DeTomaso] Hp difference between efi and webers
>
>I agree with everyone else's responses.  They will operate at similar 
>levels of peak power more dependent on tuning than on the system.
>
>Based on what I've read, your peak horsepower with a big Holley will be 
>higher than with webers or IR EFI.  This is due to the air flow 
>limitations of the IR system.  With a Holley and a single plane manifold 
>you can pull the full CFM capability for all 4 butterflies on each 
>cylinder, while an IR manifold only sees the single butterfly.  I 
>believe a 48mm weber is rated at about 330CFM.  This maximum depends on 
>your engine build and won't show a difference with a stock 351C.
>
>Of course in terms of everything else (drive-ability, mileage and 
>starting) a well tuned EFI system or a well tuned set of webers will be 
>better.
>
>The question you need to answer is the relationship of price vs. peak 
>power vs. everyday usage.
>
>Paul
>#9270
>
>boyd casey wrote:
>> I know the efi setups are supposed to increase drivability , improve mileage
>> and startability but based on just horse power difference What can someone
>> expect if all othet things remain unchanged and I were to convert from a
>> Holley 650 with an Edebrock  type aluminum intake manifold and  a. switch to
>> 4 weber IDF's  (with the appropriate venturis or a weber style( throttle
>> body)  efi ( Redline, TWM, Dynatek, Imagination injection )  is there a
>> substantial HP difference?
>> 
>> Boyd 1973L # 5783
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