[Biturbos4] Bum Turbo??? Help me with the Gutless Wonder!

j y jimnetpa at yahoo.com
Thu Sep 1 14:20:10 EDT 2005

You need to put a load on the engine and produce higher boost readings. The readings that you produced earlier were at low RPMS. You need to log VAG blocks 003 and 115 at 3k - 5k rpms to see what your chip is really doing. 
I have a GIAC-X chip that spikes to 1.3 MBAR and tapers back to 1.1 -1.2 MBAR in the 3k -5k RPM range. I do these runs in Tip mode, so I can hold the powerband in 3rd gear longer. If you have a 6 spd, you need to be doing these runs in 3rd gear almost to the redline. See what numbers VAG-COM produces during these runs. 
You said that you have no (obvious) boost leaks, so you should have no problem going WOT to the redline. 
What chip is installed in your S4?

If I am 'only' reading 1890 as max boost, minus atmosphere, that gives me .9 

being chipped I *should* see over one bar, but Vag-Com parameters list 1880 
as max - do you know if there sensor reads above that?

thanks for all the help figuring this out.

>From: j y 
>To: Adam at ChadtheDog.com, biturbos4 at audifans.com
>Subject: Re: [Biturbos4] Bum Turbo??? Help me with the Gutless Wonder!
>Date: Thu, 1 Sep 2005 09:50:07 -0700 (PDT)
>read my follow-up post.
>Adam Jansen wrote:On the subject of MBAR and the 
>readings on 115...
>is that pressure including exclusive of atmosphereic pressure?
>at idle it was reading 920 mBar - I would expect zero...
>at full load 1890 mBar
>Is the issue that is was below sensor range at idle and exceed at full
> >From: "j.koenig"
> >To:
> >Subject: Re: [Biturbos4] Bum Turbo??? Help me with the Gutless Wonder!
> >Date: Thu, 1 Sep 2005 10:52:28 -0400
> >
> >Just to be accurate, "MBAR" is milli-bar. 1 Bar (1000 mBar) = 14.7 psi =
> >standard atmospheric pressure
> >
> >
> >----- Original Message -----
> >From: "j y"
> >
> >
> >2) If you aren't chipped - log channel 115 in VAG-COM to get your
> >actual/requested boost. Non chiped boost should be less than 1 MBAR (14.7
> >psi). Chipped S4s can use this channel to see what the ECU is reading in
> >terms of boost too.
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