[Biturbos4] Fw: turbo boost specified vs actual

[Robin Gibson]

----- Original Message ----- 
From: Robin Gibson 
To: biturbos4 at www.audifans.com 
Sent: Friday, May 19, 2006 9:36 AM
Subject: turbo boost specified vs actual


Hi

I have been logging vag com block 115 and notice a significant difference between specified and actual boost under some load conditions.  At low load/rpm actual boost is often 10% above specified eg 980 specified, 1080 actual.  At high load and rpm this is often reversed, eg 2130 specified vs 2050 actual.  Some individual readings show a large difference eg 1040 spec vs 1300 actual, but these large differences are short-lived.  Can anyone advise from their own experience if this is typical?  Engine is ABT chipped to 310hp.

Thanks for your help
 
Robin Gibson

1999 S4 AVANT