Loss of boost at 4500 rpms.

[SuffolkD at aol.com]

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Allan:
Not sure what your trying to do.
Depending on the gear you do your boost test in, the ECU "map" is designed to
lower the boost towards redline to prevent turbo overspin.  Built in
safegaurd by engineered design.
-Scott in BOSTON

Is there anything that cuts back at 4500 rpms.  I can hit 1.7 bar then when=
i get to around 4500rpms the boost will slowly decrease.  I changed bypass=
valve to hyperboost valve and it helped a little.  Checked Wastegate, Wast=
egate Frequency valve, knock sensors, mass air flow all hoses and boots and=
still boost drops on me.  Please someone help.  I have taken it to 2 Audi =
shops and they cannot figure it out as well.  Compression test was done and=
170 across the board, turbo was also checked and it is good.  Mods on car =
are K&N filter, hyperboost valve, straight through exhaust no cats, Hoppen =
chip.