Venturi effect with efi throttle bodies

[Fred Miranda]

In an EFI system, if you want velocity, design it into the runners
not the throttle body. (unless it's individual t-bodies, in which case the 
t-body is part of the runner)

I don't see how lack of velocity through a t-body on a plenum setup
would hurt low end. If you want velocity(in the t-body) back off on the
throttle.

Fred


At 11:48 PM 3/28/97 +1100, you wrote:
>Hi all, 
>
>I was wondering about needing a venturi in a TBI system to aid in 
>increasing air speed through a manifold, as this is used to suck air/fuel 
>from a carb into the airstream in a carbed system. Is this unnecessary in 
>EFI? wouldn't low-end torque suffer due to a lack of air speed at low revs?
>
>My apologies for such a gumby question, i am in the thinking stage for an 
>TBI system for my car, and wouldn't want to overlook such a thing while 
>designing it. I will be using stromberg throttle bodies (just the 
>throttle - no venturi) bolted to what will essentially be 38mm ID Al 
>piping with injector mounts.
>
>Thanks very much,
>
>		Bruno. (b.marzano at student.canberra.edu.au)
>
>	Early to bed, Early to rise
>	Makes a man and woman miss out on the night life
>						-Morphine
>
>
>