Advice for new 90tq needed

[Jim Green]

> Hi Jim, Thanks for responding.
>
> I do have a stock MC-1 intake manifold and it has a
> little 2" piece of rubber hose between the head and
> intake manifold. That should be OK right ?

Yes.

> There is another  connection right next to the TB
> that
> I wasn't sure about (What is this for ?). So I just
> routed it to intake vacuum.

The little brass tube on the back side of the TB?  I
don't know what the hell that does, I always leave it
disconnected.


> A third connection coming off the hot side of the
> turbo just before the intercooler inlet was also
> routed to vacuum (could this be a problem ?).

Hot side(usually exhuast side)?  Do you mean
compressor outlet?  I don't think there are any vacuum
hoses between there and the IC inlet.  Should just be
that big funky "J" hose.

> I do have a bypass valve (brand new) in blow off
> mode
> attached to a intercooler outlet (intercooler from a
> KH turbo) but I don't think its leaking.

Ahh!  Make sure the pressure is hitting that diaphram
at 90 degrees.  If it's backwards the pressure will
hit it strait on and cause it to leak.  Check the SJM
site for a diagram.  I've put it on backwards before.
If you have it plumbed into the intake, it doesn't
matter as much because no metered air escapes.  This
could also be a problem, when it opens it dumps all
that metered air, and causes excess fuel to be
injected.  The system is to stupid to know the air
really isn't there anymore

> Wouldn't a leak send me to the lean side anyway ?

Under vacuum, yes, boost will be rich like I said
above.  I bet your problem is related to one of these,
it sounds like we're on the right track.  I had tons
of little issue like this that took a while to get
sorted out, so don't get frustrated.  You'll just get
to know your car that much better!

Later,

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

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