[s-cars] Boost Controller...Closed or Open Loop?`

[Calvin & Diana Craig]

Kirby,

Thanks for the response.  Maybe I should have been a little clearer, though.
I meant the way the stock computer acts.

--Calvin

-----Original Message-----
From: Kirby Smith [mailto:kirby.a.smith at verizon.net]
Sent: Friday, November 15, 2002 10:08 PM
To: Calvin & Diana Craig
Cc: s-car-list at audifans.com
Subject: Re: [s-cars] Boost Controller...Closed or Open Loop?`


The Apexi AVC-R (I think the name is) adjusts the duty cycle to attain
the preprogrammed boost vs. rpm and gear.  The duty cycle it first
applies in anticipation of the proper boost is learned from past
experience.  Thus, the duty cycle varies over the seasons.

kirby

Calvin & Diana Craig wrote:
>
> I will probably figure this out in the next few days but I just wanted to
> see if anybody knew beforehand so I can know what kind of behavior to
expect
> when I do the mods. I am planning on.  Is the boost controller an open
loop
> system....i.e. has an N-dimensional lookup table based on N sensors and
> produces a duty cycle to the WGFV based upon the numbers in the table,
kind
> of like the WOT fuel & spark curves.
>
> OR does the computer have the table and then adjust the duty cycle
depending
> upon the feedback from the pressure sensor, kind of like an 02 sensor at
> partial throttle cruising down the highway.
>
> Let the speculation begin....anybody with hard facts or empirical results
> that would be great!
>
> --Calvin
>
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