[s-cars] occaisional slight over-overboost?

[chris chambers]

I am in no means a guru, buuut this is the things I recall reading about.

1. Start by pressure testing your boost hoses to see if you have a leak in
the system. A leak in one area can cause the turbo to spin faster resulting in higher pressure in other areas of the system. 

2. If there isn't any boost leak then I'd start looking at the WGFV aka waste
gate frequency valve. It's the valve that converts the electronic signal
from the ECU and controlls the waste gate which cuts out boost. You can
read about it here: http://forums.audiworld.com/showthread.php?p=18873174

My understanding is that it can get gummed up with oil and can be cleaned with carb cleaner, but I recommend verifying this first.


HTH
Chris
--- On Sun, 3/29/09, JC <jc at j2c3.com> wrote:

> From: JC <jc at j2c3.com>
> Subject: [s-cars] occaisional slight over-overboost?
> To: s-car-list at audifans.com
> Date: Sunday, March 29, 2009, 9:37 AM
> Threw this question up on QW the other day to no avail
> (clearly "which
> wheels look best..." questions get more replies...)
> anybody have any
> suggestions?
>  
> ------------------
>  
> couple times the other day coming back down from mid-coast
> maine under heavy
> throttle ramp-merge type situations my boost gauge alert
> went off, and it
> looks like I was hitting a momentary peak of something like
> 1.6 gauge with
> my gauge alarm bleeping in protest. 
> 
> I have the gauge alarm set a hair above 1.5 and normally
> the peak boost is
> rock-solid dependable at the exact point. this is the first
> time the alarm
> has ever gone off.
> 
> I think the MIL/CEL flickered at the same time once when
> this happened. no
> haven't pulled codes yet and I will do, but MIL/CEL is
> not on now. 
> 
> any thoughts? I thought it the ECU wouldn't allow
> exceeding 1.5 without
> upgrading the MAP with and having corresponding software,
> but perhaps I have
> a malfunction.
> 
> oh yeah, patient details: 
> TAP-crap chip, cranked WG spring, Stromung. 
> runs perfect otherwise.
> 
> only thing new-ish is that I recently removed the MAF
> screens but the first
> few days of WOT testing didn't trigger this behavior. I
> can't get it to
> reproduce every time but occaisionally it recurs.  
>  
> UPDATE: seems that maybe it will happen after every restart
> - i.e. if it
> happens once I can't seem to get it to repeat.  but
> next time I drive the
> car it'll happen again... 
> 
> thoughts from the gurus?
>  
> ---- current ----
> 1995.5 S6 Avant 
> ---- past lives ----
> 2006 A4 2.0TQA
> 1998 A6Q 2.8 PES G2
> 1989 200TQA SJM
> 1990 CQ
> 1997 A4 1.8TQ Wett
> 1987 4kCSQ 
>  
> John J. Cunningham
>  <mailto:jc at j2c3.com> jc at j2c3.com
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