re: 26 psi boost

["Lawson, Dave" <dlawson@ball.com>]

>
    I own a 1987 5kCDQ and have a QLCC chip in it, a pressure regulator
controlling the wastegate, and 3" exhaust from downpipe back.  I have
recently installed a boost pressure gauge and have found that I'm
getting
about 14 psi boost pressure.
>
That is just what this version of the code was designed to do, You don't

need the pressure regulator for this, the chip uses the WGFV to produce 
the extra boost.

>
    As I have been following the list, I noticed that there are a few
members who are running 18-26 psi.  I would be very interested to find
out
how they are running such high pressures without getting fuel pump
shut-off
(I hate FPSO).  Have they bypassed the fuel pump relay?  Are they using
a
different chip?  Special Wastegate controllers?
>

They are probably(just an assumption follows) running an IA or TAP or 
Superchip modified ECU, which uses some sort of resistor/zener diode
hardware hack which clamps the pressure transducer output voltage, 
thereby giving no FPSO.

>
    Don't get me wrong, 14 psi is nice but I need more.  How does
running
such extreme boost pressures effect our MC engines?  My car is a daily
driver as I'm pretty sure these super-boosted cars are so I assume that
these engines can handle the extreme pressures forced upon them.  How
much
HP would 26 psi give to the MC engine, what cost is involved?
>
Have you read any of the info which has been presented over the past 2 
weeks pertaining to running masive boost pressures? Why do you think
your car should be running in that region? Have you replaced your turbo
with a unit which is more efficient running a larger pressure ratio?
Have
you installed a performance head which increases the volumetric
efficiency
of your engine? Have you increased the displacement of your engine so
that your stock turbo is now undersized for the job at hand? Are you
running a single pass intercooler?  If you answered no to these
questions, 
26psi of boost will just add more heat to the intake air and make your 
engine produce less power. It sounds as though you have begun work
to exhaust lot's of air, but my questions are about the intake tract and
what
you have done there to ingest lot's of dense/cold air.

If you car is mostly stock, the answer to your question was detailed in 
numerous posts and the answer is no. 26 psi sounds cool, but is 
completely wrong for the 134 CI I5 turbo engine we are all familiar
with.

HTH
-
Dave Lawson
'90 200 TQW - 1.6 PR
83 ur-q - 2.0 PR