Audi TT boost?

[John Shost]

Boost drops as can be seen in this graph. TT has 2 pressure sensors, one
mounted on the first intercooler (turbo reading) and one mount on the intake
manifold. Also shown is the boost level that the ECU is commanding. Data is
a 4th gear run. Boost rise relative to RPM comes sooner with higher gears
(6th highest) & later with lower gears (1st latest). Stock chip will hit 2.2
bar peaks in second gear (it takes time for the wastegate to open) & doesn't
quite make it to 2 bar in 6th gear. With a chipped car you can slam the
throttle shut to set up for a curve then quickly go back to WOT, this will
produce 2.6 bar readings. I would expect a stage 3 car to produce peak boost
in the 3200 - 4000 rpm range & at a level greater than 2.5 bar. Have never
measured one though.

link to graph:
http://forums.audiworld.com/tt/msgs/281935.phtml

On Fri, 3 Aug 2001 16:16:59 -0500 (CDT), Festively Jolly wrote:

>  hey lads.  ive been playing the game Gran Turismo 3 on PlayStation2.  I
>  got the TT and the S4 (only Audis to appear in the game as they reduced
>  the # of cars to about 120 rather than 500 as in Gran Turismo 2.  it had
>  about 7 Audis.)  Anyhoo, My TT is modded fully with stage 3  turbo
>  etc... and 406 bhp.  well the boost on it rockets to 2.0 bar at low rpm.
>  then as it reaches the redline, the boost gets really low.  so as the
>  redline rises, the boosts lowers?  is this what it is like in real TTs?
>  this IS the most accurate driving simulator ever. every car has its own
>  handling quirks and all cars are individually tested.  all other cars,
>  such as my S4 (609 bhp),  when put to the floor,  the boost maxes and
>  stays all the way up through the rpm.  is the TT boost correct?
>





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