Re: Turbo questions - K24, WG Spring etc.

[JShadzi@aol.com]

In a message dated 11/23/99 11:40:20 AM Eastern Standard Time, 
mlped@concentric.net writes:

<< Further, I don't believe that the wastegate ever bypasses all the exhaust
 gasses, it just bypasses excess gasses.  The point I'm trying to make is
 involves the concept of "boost" occurring "sooner" in a given rpm / load
 range - simply as a result of shimming or using a heavier spring.  The
 strength of the spring has no effect on the initial build up or presence of
 boost; it may prevent overboost from "leaking" away sooner, i.e. the "creep"
 you don't want, but it I don't think it will cause an otherwise "unboosted"
 engine to come into boost faster.  Further, I think that if the other
 components of the boost control system are working correctly, the ECU should
 be providing the pressure needed to keep waste gate "creep" from occurring.
 But maybe that's in an ideal world....  I think the S-car engines are
 supposed to be set up to operate this way.  I don't know about the earlier
 Audi turbo systems.
 
 Mike P.
  >>

    I agree, the main issue here is if boost creep is really occurring too 
early or not.  If it is not, them there is no improvement for the onset of 
boost by modifying the wastegate.  It has been my understanding, however, 
that this is the main issue being discussed here and thus I was addressing 
it.  It seems that according to Sacchelle, boost creep is a problem he has 
been trying to remedy...  
Javad