90qt update and input needed

[Jim Green]

--- ed armstrong <edshred2000 at yahoo.com> wrote:

> Everything is much better, almost great....except it
> really makes no boost. Maybe only 1-2 psi. Worse, at
> around 5K rpm the power just shuts down immediately
> like the fuel is cut or timing retarded. All the
> turbo
> plumbing like MM hose, intercooler appear to be
> sound
> and tight. I do have a blow-off valve plumbed
> between
> the intercooler and CIS meter head boot but I think
> it
> is working correctly. The wastegate diaphram looked
> OK
> when I was building the adjustable wastegate a year
> of
> so ago.
>
> Any ideas on this one ? Basically at low rpms it
> drives like a regular car, but at mid-to high there
> is
> little or no boost and then a complete loss of power
> at 5K rpms.

It really can only be one of two things, a stuck open
wastegate, or your bypass valve is installed wrong.
This is how you DON'T want it.
http://www.geocities.com/jeg1976/samco.jpg





> Another niggling problem is the carbon canister
> solenoid. Its always clicking about 3 times a
> second.
> I don't remember this behavior when the NG was in
> there. One end of the solenoid is plumbed to the
> carbon canister the other to the turbo inlet. Any
> ideas ?

Idle switch problems? A solution, eliminate the valve
till you need emisions.  Mine is just venting through
a small hose that is run down close to the bottom of
the car.

=====
Jim Green
'89 90tq 034EFI, Haltech IG5
http://www.geocities.com/jeg1976/car_home.html

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