5kCSTQ Performance Modifications

[Robert Deis]

On Fri, 28 Mar 2003, David wrote:

> How long to the diaphram types last when on a turbo-5? I know they fail
> quite fast on chipped 1.8Ts and 2.6TTs...

Can't speak to those failure rates becasue I don't know.

What I *do* know is that running 17psi gauge for 4 years in my 94 Talon
the stock valve has never failed or leaked.  Stock boost there is ~12psi
and 2.0 displacement, more boost than I'm likely to run in the wagon.

I've seen/heard of no failures in the 95-99 valve at 13psi or below, but
they open at 13psi and leak even when new- triggerhappy spring choice on
the part of the engineers.  (Qualifying: Most 95-99 car owners I know
upgrade to the early design in short order so they can run above 13psi.)

It's possible that the I-5 and/or other cars you mention have bigger
problems with heat and oil vapor in the intake tract thereby increasing
the failure rate- dunno.

If I was to go with something other than the mistu, I'd probably choose a
piston type based on the same comments you saw.

------------------------------------------------------------------------------
  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