[s-cars] Bypass valve questions

[Djdawson2 at aol.com]

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In a message dated 6/23/2003 7:14:03 AM Mountain Daylight Time, HoosierMP
writes:

> Plan on pulling the piston valve apart every other oil change and cleaning
> it to prevent the piston from sticking in it's bore. IMO, piston valves
> stink.

Hmmm, none of the guys that reported on their performance bypass valves
seemed to mention this issue.  I guess I'll see.  Plus, I can deal with a
serviceable part much better than one that turns to junk, and/or has the possibility of
having parts of it inhaled by my costly turbo.

 The OE valve is the same design as the 710N. Sounds like you need a butt
dyno
> calibration : )
>
> Richard

he he... the butt dyno.  Actually, I'm checking my changes with a G-Tech.  I
don't want to get into a debate over its accuracy, but it does seem to be VERY
consistent.  It doesn't really matter to me if the numbers are accurate as
much as having something to identify/quantify the effects of changes.  That, I
believe, it does quite well.  And in that regard, shows the 710N to be a bad
choice of valves (among the OEM variants).  All of the Bosch bypass valves
appear to be of the same design when disassembled.  The only variance is in the
spring.
FWIW,
Dave in CO