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

[Eric D Byrd]

Yeah, as I mentioned before, boost pressure is not manifold pressure. 
Boost is what is in your intake, before the TB.  If you can get full
boost at partial throttle, then opening the throttle will allow manifold
pressure to come up to your boost pressure.

On Mon, 28 Oct 2002 11:53:24 -0600 (CST) Nick Starai
<true at ItsYourDomain.com> writes:
> 
> 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
> 
> On Mon, 28 Oct 2002, Adam Wade wrote:
> 
> > --- arnie <arnie_ at charter.net> wrote:
> >
> > >> increasing the throttle opening would have no
> > >> effect on the acceleration of the vehicle,......
> >
> > > Are you confusing pressure with total flow?
> >
> > No.  If you can maintain a constant MAP despite
> > increases in rpm, then you are delivering the same
> > amount of air to each combustion chamber on each
> > revolution, given a similar VE (and at higher rpms,
> > the VE generally does not change appreciably over a
> > fairly small rev range).  So your acceleration rate
> > would be almost 100% consistent with a change in rpm,
> > without anything else being a factor.  In fact, if you
> > can maintain a constant MAP of any given number, the
> > only factors controlling acceleration would be a 2D
> > table of rpm and VE, as far as I can see (assuming
> > spark timed for optimum peak pressure timing).
> >
> > =====
> > | Adam Wade                       1990 Kwak Zephyr 550 (Daphne) |
> > |   http://y42.photos.yahoo.com/bc/espresso_doppio/lst?.dir=/   |
> > | "It was like an emergency ward after a great catastrophe; it  |
> > |   didn't matter what race or class the victims belonged to.   |
> > |  They were all given the same miracle drug, which was coffee. |
> > |   The catastrophe in this case, of course, was that the sun   |
> > |     had come up again."                    -Kurt Vonnegut     |
> >
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