[BiturboS4] S4 charge pressure control

[Simon Roberts]

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The graph shows charge pressure against time. The failure in the graph was
sixth gear but it can occur in any gear

Simon Roberts, Senior Design Engineer
BERU F1 SYSTEMS
Technical Centre
Owen Road
Diss
Norfolk IP22 4ER
Tel:  +44(0) 1379 646212
Fax: +44(0) 1379 646909
Mob: +44(0) 7771 727201
www.f1systems.com

-----Original Message-----
From: California Fields [mailto:cfields72 at hotmail.com]
Sent: 29 May 2003 20:10
To: Simon.Roberts at F1Systems.com
Subject: RE: [BiturboS4] S4 charge pressure control

What exactly did you measure in that graph (i.e. what are the axes)? Also,
do you see this Y-value drop in all gears or just 6th?

Carter.
>From: Simon Roberts
>To: California Fields
>Subject: RE: [BiturboS4] S4 charge pressure control
>Date: Tue, 27 May 2003 17:35:52 +0100
>
>Thanks for that, I have logged the signal from the charge pressure sensor
>and have attached the plot.
>
>As you can see, pressure is right up there then there is a spike something
>causes the ecu to cut boost, do you think that this could be a faulty N75
>causing this problem
>
>Thanks
>
>Simon Roberts, Senior Design Engineer
>BERU F1 SYSTEMS
>Technical Centre
>Owen Road
>Diss
>Norfolk IP22 4ER
>Tel: +44(0) 1379 646212
>Fax: +44(0) 1379 646909
>Mob: +44(0) 7771 727201
>www.f1systems.com
>
>-----Original Message-----
>From: California Fields [mailto:cfields72 at hotmail.com]
>Sent: 27 May 2003 17:38
>To: Simon.Roberts at F1Systems.com
>Subject: RE: [BiturboS4] S4 charge pressure control
>
>Simon, attached is a Microsoft Word document that I created a while back.
>It's an impromptu assembly of AudiWorld posts that seemed relevant to a
>boost problem I was trying to diagnose at the time. Also included is a
>diagram of the N75 valve. You might find it useful. Keep in mind that a
>boost loss problem has many possible sources - only one of which would be
>the N75. I would check for physical boost leaks first, log some data blocks

>using the VAG tool, check for torn throttle body boots and diverter valves,

>etc, first.
>Good luck, Carter.
>2001, GIAC-x, Miltek 3" exhaust.
>
>
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><< Boostfailure6thgear.pdf >>


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