[DeTomaso] Hp difference between efi and webers

[P. Rimov]

Based on your statement  below one could presume then that a 1000cfm 
throttle body EFI would make as much peak horsepower as a perfectly tuned 
big Holley but have the advantage of drive-ability, mileage, starting with 
broader fuel mapping that cost less than most IR Webber based EFI set ups 
thus making it a closer price vs peak power vs everyday usage comparison 
even though the IR Webber based EFI set up has a much much better oh ah 
factor.

Paul
----- Original Message ----- 
From: "Paul - Home" <thedrol at pobox.com>
Sent: Wednesday, October 29, 2008 9:23 AM
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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