[s-cars] Bypass valve questions

[Djdawson2 at aol.com]

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All,
I recently finished with engine upgrades (RS2 stuff).  Following the
upgrades, I soon noticed the telltale mid-rpm moaning of a failed bypass valve.
Looking around, I noticed Hoppen carried a version of the Bosch part... suffix of
110 (as opposed to 114 or 108).  There was a long story about 400 and 500hp MTM
engines, and this bypass valve being a good solution.  I ordered away.  After
installing the part, I could immediately notice the difference.  Huge lag
between shifts, and what seemed to be a missing top end hit.  There isn't much to
replacing a bypass valve... but I double checked.  All was OK (no, I didn't
install it backwards).

I removed the part.  I hooked up the small manifold port via a hose to some
low pressure regulated air (10psi).  It was leaking away.  The diaphragm must
be shot.  My original doesn't do this.  So then I hooked up air to the valve on
the boost inlet port.  The original (108) starts to seep air at 19-20psi.
The new (110) valve begins to seep air at 24-25psi.

Well, I'm not going to bother with another Bosch unit.  It would be one thing
if you got some reasonable service life from it, but what the heck?  Anyone
have a suggestion about a good aftermarket alternative for our type of
application (about24psi boost, in this instance)?  I'm not looking for anodized
purple, or neon illuminated... just a bypass valve that is effective.
TIA,
Dave in CO