[Diy_efi] Re: Question about speed density, etc.

[Startled Jackrabbit]

This observation (see referenced post below) is what I
originally meant when I said that my boost pressure
stays the same if I let it pressurize fully at a high
throttle angle and then open it to WOT.  My gauge is
tapped at the manifold, not before the throttle body. 
My wastegate pressure source is directly after the
turbo, but this is irrelevant to the above situation. 
There may be a pressure drop between the compressor
and the manifold, but it is fairly linear and doesn't
matter once the wastegate opens.  When that happens,
the turbo will not allow the pressure to get any
higher, regardless of where you measure it.  If that
maximum is 12 measured in the manifold, well,
regardless of throttle angle, its not going over 12.


>I've also wondered the same thing. I've got my MAP
>source for my boost
>controller on the Surge tank (after throttle plate).
>I can build full
>boost at partial throttle...and wondered if 100% at
>this point will do
>anything at all. Isn't the compressed air basically
>sitting in the
>intake manifold waiting for the valves to open at
>this point anyways? 
>Will a 100% open throttle plate even allow more air
>in? Thanks.

>Nick Starai

Hopefully this clears up a little of what I meant...
but I am enjoying the discussion all the same!

Over and out,
JeremyB.


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