[Diy_efi] Throttle body sizes

[mark]

I do not know about throttle bodies , but auto makers and after market 
carbs are flowed at different  depressions. For carbs I know there are 2 
standards that they are flowed at.One is used for OEM ,to test real 
world street use and the other is for all out performance testing . 
There is also  a formula on one of the after mark sites to convert from 
one to the other.
  Going back to the first topic ,if you find a chart of flow rates ,you 
will have to check if the data was all done at the same depression.

Joe Lutz wrote:

> I don't mean to change the subject, but this brings up a question I 
> have.  At what depression is the standard for rating the flow rate 
> (cfm) of throttle bodies and carbs?  There must be a standard because 
> the flow obviously depends on the pressure differential so these 
> things would have to be flowed at the same pressure for fair comparison.
>
> Thanks,
>
> Joe
>
>
>> From: "Chris Carson" <fastcarson at prodigy.net>
>> Reply-To: List for general do-it-yourself EFI talk <diy_efi at diy-efi.org>
>> To: "List for general do-it-yourself EFI talk" <diy_efi at diy-efi.org>
>> Subject: [Diy_efi] Throttle body sizes
>> Date: Thu, 17 Jul 2003 18:15:01 -0400
>>
>> Does anyone have a chart or list of what the flow (in CFM) would be in
>> various GM TBI throttle bodies with the injectors cut out for use with a
>> MPFI system?? Specifically looking at using the 454 TB, but I am 
>> worrying
>> about choking my (warmed over) 403.
>> Thanks, Chris
>>
>>
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