Bypass installation

[Robert Deis]

On Thu, 6 Sep 2001, Ken Keith wrote:

> > No--  The purpose of the CBV is to release a pressure wave
> > that was *created* when the throttle closed abrubtly.
>
> I think the throttle plate in question is regarding the metering plate
> in the fuel distributor, not the throttle body plate (which I think is
> what you are referring to).

That's what I was referring to, yes. If the metering plate is what he
meant, then there is a minor concern to be dealt with.

> It seems to me that the metering plate would be let down a bit
> when the throttle is closed, reducing the flow of fuel to the motor.
>
> Otherwise, an overly rich condition would occur since the air
> recycling through the turbo would not be going into the motor, but
> the plate would still act as if it was.

That's what should happen, yes. The air meter should register that you're
drawing less air becasue you're using the extra that was vented through
the CBV.  Otherwise you go rich when shifting.

If, however, the CBV dump tube is routed in such a way that it can send
the pressure wave all the way back out the the air meter, it can foul the
measurement.  Some newer(asian) imports experience this with certain
modifications.

I would expect a straight T close to the compressor inlet to work just
fine.  An angled T that points toward the compressor inlet might be even
better.

-- 
------------------------------------------------------------------------------
  Rob Deis                  "Let the people know beforehand what the law
  MiB3347                      is and what they are to expect."
  rdeis at io.com                              -- 18th Congress, Rec. 75