Re: Dump valves (was Max boost)

[Wallace White <wallace@remdesign.com>]

Daniel Hussey wrote:
> 
>      A Dump valve literally dumps the excess pressure straight into the
> atmosphere.  A bypass valve does basically the same thing (bleeds off excess
> pressure), but rerouts it back into the the system before the cold side of
> the turbo.  This keeps the turbo spinning in-between shifts and basically acts
> as an anti-lag system.  It also prevents back-pressure from when you come off
> the throttle from blowing hoses, IC's and stalling the turbo.

Whil I too have no experience with them, I thought that bypass valves
were vacuum actuated, rather than from excess pressure, so that they
open when you lift off the throttle?

- Wallace
  '87 5kcstq 152k