[DeTomaso] Hp difference between efi and webers

[adin at frontier.net]

Recently saw a throttle body rated at 1350cfm ("should surpass a 1250  
carb") that was slick - the "secondaries" were the old holley 3  
barrell style. [1]

No reason a tune-able EFI couldn't make the same ponies as a carb, eh?

As far as drive-ablility - my latest project isn't.  this is due more  
to the big air-gap manifold and lack of carb heat and cold weather.   
Once warmed up it seems to spin the tires easily.  If your veehickle  
doesn't have warm air and carb heat (hot water manifold) it isn't the  
carb's fault, is it?


David, there is NOTHING like 500+ ft/lbs under your foot. NOTHING.



[1] secondary was a BFC (big cavern)




Quoting "P. Rimov" <rimov at charter.net>:

> 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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