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

j y jimnetpa at yahoo.com
Thu Sep 1 12:26:37 EDT 2005

VAG blocks:
003 - MAF nbrs (chipped cars should be topping 200 g/s - I maxed out @ 272 g/s)
114/115 - boost
033/032 - Air/Fuel readings (@ WOT .86 is the desired setting for chipped cars - not too lean or rich (.86+) - according the AudiWorld gurus)
029/028 - correction factors for timing (not 100% sure on this one)

Adam Jansen <aedan1 at hotmail.com> wrote:
Its not the turbos...

Yes I am chipped, no boost gauge... but here is what I logged

RPM throttle position mbar
1240 22.7 920
1880 35.3 920
1920 57.6 1330
2160 100 1890
2480 100 1870
2920 100 1870

So it seems to spool quickly...
Now how to I log knock and timing?

thanks for all the help!

>From: j y 
>To: Adam at ChadtheDog.com, biturbos4 at audifans.com
>Subject: Re: [Biturbos4] Bum Turbo??? Help me with the Gutless Wonder!
>Date: Wed, 31 Aug 2005 22:38:36 -0700 (PDT)
>1) Are u chipped? If yes, do u have a boost gauge? If yes, what's it 
>reading at low rpms?
>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.
>3) You already did a throttle body adaptation using VAG-COM - so that 
>doesn't appear to be the problem.
>4) Check your VAG-COM fault codes for DTCs.
>Adam Jansen wrote:
>With all this talk about torque down low, it really has me wondering what 
>up with my 00 S4...
>I was having problems with the potentiometer in the Throttle aways sending
>me into EPC, really wrecking havoc with my 'fun'. SO I openned up the TB
>(even though bentley says no) and cleaned the contact runners for the
>throttle position sensors...
>Well my car still doens't want to 'run' until I am up over 3KRPM - it is
>dead in the low power band.
>Did the adaption on the TB, gettin 12.5% and 83.9% for the two readings on
>062 so I am within spec (although 87% is max openning reading on throttle).
>So it doesn't appear to be that causing my problem
>Also did a boost leak test, no leaks that I could hear. Interesting when I
>started the car afterwards I had a good deal of smoke for about 1.5 miles
>trailing behind me...
>But still no leaks, so that shouldn't be it either...
>How can I tell if one of my turbos has gone south and I am spooling on one
>turbo only?
>is this somethinng Vag-Com can monitor?
>I really miss the head snapping grunt on the low end and want to know where
>it went!
>SPokane, WA
>00 S4 59K miles
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>Biturbos4 at www.audifans.com
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