[s-cars] Hose leak and boost gauge 'tap' location

[Russ Panneton]

On Wed, 8 May 2002 12:30:53 -0600, you wrote:

>Bruce,
>No, you are not missing something.  The hole you have isn't large enough
>that the turbo cannot spin fast enough to make 19-20 PSIG of boost (your
>gauge is correct).  You are spinning the turbo a lot faster than you
>would be without the leak, thus adding more lag and heat resulting in
>the lackluster performance.  The hole probably closes under vacuum, so
>it has little affect there.  Now if the leak were much larger, you would
>be seeing the boost fall, and perhaps idle and/or stalling symptoms
>under vacuum.

The vacuum is only developed between the throttle plate and the engine -- well
downstream of the hose with the hole in it.  A blown hose upstream of the
throttle plate won't affect vacuum, only boost and mixture since the MAF is
sensing more air flow than the engine is actually getting.

Russ
--
Russ Panneton                          russ at s-cars.org
Nederland, CO              "Too bad ignorance isn't painful"