RE: Bypass Valve Installation

[QSHIPQ@aol.com]

>Hooking up the dump valve on bros car.  Tee'd into one of two vacc. lines
>at back of intake manifold but it now creates such a vacc. leak at the dump
>valve that the car dies on any off throttle.  Valve is installed in port of
>Samco hose(inline with intercooler/intake.  Tried installing valve both
>directions same effect.  Any ideas would be greatly appreciated.

>Thanks,
>Dave

Dave:  
The valve vacuum feed should be hooked up 90 degrees to hi pressure air.  I
usually hook them up to the throttle body vacuum feed (directly below t-body
flap).  You could have a defective valve/spring.  The test is to put pressure
to the bottom of the valve, it should start to crack open no sooner than 6psi.
If it opens sooner, you have a weak spring in the valve, and engine vacuum
will open it.  Are you sure the SAMCO is sealed at the t-body correctly?  I've
had several leakers, to solve that problem you need to cut the end of the hose
at an angle (longer on the bottom).  I also find that the stock hose clamp for
the t-body doesn't work well on the SAMCO's.  I use a wider clamp.

If all cks for the bypass valve are correct, you can put a restrictor in the
line feeding it.  As a general rule, all valves should work with the turbo
motors off throttle.  The sport q (and blue tap aluminum) ones open later than
the stockers due the the stiffer spring.  If you have done any head mods, you
can see a higher off throttle vacuum.  Try moving the vacuum tap first

HTH


Scott Justusson
QSHIPQ@aol.com
'87 5ktqwRS2
'84 Urq