Miatapower List Archive

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Mail From: Toby Weir-Jones <(email redacted)>


Part 2 of the Boost Control setup took place today on the way home.

Chip rev 0325x
WG BASE = 150
WG RPM = 7500
WG SNS started at 99
LAMBDA ON

5th gear, floor it, setting WG SNS to 35 produced vaguely tolerable
results. I saw the note in Ray's comments about adding a restrictor to
the solenoid outlet, that's one issue I presume i understand correctly.

however, the weird behaviour is as follows:

part-throttle, where MAP is greater than 100 but not WOT (somewhere
between 0 and 6psi boost), the keypad showing the WG SNS screen, the
user-selectable value would tend downwards during the part-throttle
application. This downward trend would move at between 1 and 4 points
per second and could make it all the way down towards zero.

setting WG RPM back to 3600 did not resolve the pattern.

is it meant to do this? am i missing something?

perplexed,
twj

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Mail From: "Jeremy Schuster" <(email redacted)>


I'm sure Ray will respond to this, but I'm going through the same things you
are right now, only I seem to be one step ahead. Try increasing WG BASE a
point at a time after you set WG RPM to 3600 or whatever. By bumping mine a
few points I was able to get acceptable boost behavior. It is perfect in
fourth or fifth gear, but now in lower gears it will rise to the target and
then drop slowly to about 190 by redline. I did a bunch of logging tonight,
so hopefully I can figure it out by tomorrow.

Jeremy L. Schuster

> -----Original Message-----
> From: (email redacted)
> [mailto:(email redacted)]On Behalf Of Toby Weir-Jones
> Sent: Thursday, April 06, 2000 11:20 PM
> To: (email redacted)
> Subject: even more interesting boost behaviour
>
>
>
> Part 2 of the Boost Control setup took place today on the way home.
>
> Chip rev 0325x
> WG BASE = 150
> WG RPM = 7500
> WG SNS started at 99
> LAMBDA ON
>
> 5th gear, floor it, setting WG SNS to 35 produced vaguely tolerable
> results. I saw the note in Ray's comments about adding a restrictor to
> the solenoid outlet, that's one issue I presume i understand correctly.
>
> however, the weird behaviour is as follows:
>
> part-throttle, where MAP is greater than 100 but not WOT (somewhere
> between 0 and 6psi boost), the keypad showing the WG SNS screen, the
> user-selectable value would tend downwards during the part-throttle
> application. This downward trend would move at between 1 and 4 points
> per second and could make it all the way down towards zero.
>
> setting WG RPM back to 3600 did not resolve the pattern.
>
> is it meant to do this? am i missing something?
>
> perplexed,
> twj
>
> __________________________________________________
> Do You Yahoo!?
> Talk to your friends online with Yahoo! Messenger.
> im.yahoo.com
>

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Mail From: Ray & Cindy Ayala <(email redacted)>


There is a new feature in the BOOST screen that isn't fully debugged yet. You
can turn TPS control off and on using the middle display buttons, and it's
indicated by the letter 't'. See if the problem goes away when you change
that.

Toby Weir-Jones wrote:
> ...the weird behaviour is as follows:
>
> part-throttle, where MAP is greater than 100 but not WOT (somewhere
> between 0 and 6psi boost), the keypad showing the WG SNS screen, the
> user-selectable value would tend downwards during the part-throttle
> application. This downward trend would move at between 1 and 4 points
> per second and could make it all the way down towards zero.