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

[Eric D Byrd]

Right, I was going to say that;  boost pressure is not manifold pressure,
because  MAP is taken after the TB.  If you are at part throttle at 12
psi and you floor it, MAP goes up simply because the throttle is opened,
even though your wastegate controls boost pressure with precision.

On Sat, 26 Oct 2002 13:56:54 -0700 (PDT) Startled Jackrabbit
<bluefire211 at yahoo.com> writes:
> I think there may be a little confusion over what I
> meant in my first post.
> 
> My problem is not that the sensor would be past its
> limits.  What I am worried about is once my intake
> reaches the maximum pressure allowed by the wastegate
> (which is currently set at 12 psi, no spikes, rock
> solid, nearly independent of weather) and I am not at
> full throttle and then I go to WOT.  If more air flows
> into the engine, I am still at 12 psi, so the computer
> doesn't know about it.  If it increased to 15 psi, the
> computer would be able to read that, but the fact is
> it cannot go over 12.
> 
> So, to clarify, the sensor will not be going out of
> its range.  (I'm going to use a 36 psi absolute
> sensor, which reads about 14.7 at atmospheric which
> gives me 21.3 psi of positive pressure before the
> sensor overruns.  If I run that much boost, my engine
> will be toast anyway)
> 
> However, I don't think this is a concern, as was
> stated in a prior post, MAP is MAP.  So going to full
> throttle when I'm already at full boost shouldn't
> matter.  At least, I hope, so is that correct?
> 
> Thanks for the replies.  I appreciate all the
> thoughts!
> 
> Over and out,
> JeremyB.
> 
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