TBI throttle bore restriction

[Len Sabatine]

  Its Overwhelming how many different "cone" shapes GM has on IACs , Your 
right on
  about the profound effect they have on performance ! Subtle differences 
that produce
  major changes in overall response.
  Len

>Before you do anything, get some way to test your theories, ie a G-Tech or
>something.
>Then begin trying things.  Often with gm it takes numerous changes to really
>add up to much.   I've tried a ton of things that looked like they should
>have really helped and lost HP.  The seat of the pants game is a no win
>situation.
>
>Just as an example.
>Made a new cone for a IAC on a 747 equipped pick up, so as lessen it's
>effect on idle.  Worked like a charm at idle, but quess what?, It cost 3 MPH
>on top end.
>Ya, right who'da thought.
>Bruce
>
>
>
>Anyone know what the purpose of the umbrella shaped shroud is surrounding
>the
>injector discharge on a 5.7L GM throttle body (1989 K1500 truck)? My hunch
>is
>that it keeps the spray pattern from collapsing under high airflows, but I'm
>not even sure if that would matter. Can this shroud be removed without any
>adverse effects? It would have to improve the flow of the stock throttle
>body.
>Thanks,
>John Wilson
>
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