pressure=hp quattrorunner@lvcm.com

[JShadzi at aol.com]

Brandon, the below is wrong because pressure is only a small part of what
happens in a turbo engine.  Its like saying that in a NA engine that revs to
6000rpm that if you could only remove the revlimiter and rev it to 7000rpm it
would make that much more power.  A turbo can create pressure, and an engine
can rev higher, but making real power (getting more air through the motor) is
due to much more than single variables like those.

An example would be two pipes, the first 1" and the second 2" in diameter.
Now, flow water through each, both at 15psi of pressure.  Both have 15psi,
correct, so in your above example, both the 1" and 2" pipes would be flowing
the same amount of water, but intuitively you know that is wrong.  The same
is with a modified engine, or especially with a motor running a bigger turbo.
 Currently I am running a T3/T4 turbo in my 80tq.  At 12psi boost the car is
faster than it ever was with the K26 running even 20psi boost.  With the
bigger turbo the engine is flowing air more easily (bigger pipe) and becuase
the turbo is bigger it is running in a more efficient range, thus giving
cooler intake air temps.  Remember, its not static pressure that is making
power in the IM, its FLOWING pressure.  That 15psi actually has to move in
and out of the engine, or it won't be putting any more air in the comb.
changer.

My personal theory is that too much boost is a bad thing.  For example, if
you have to run 25+psi boost in a particlular application, chances are that
the wrong turbo is being used, and that a bigger sized turbo running 15psi
(less boost) will actually make more power.

Javad

<< Tell me, am I wrong in assuming that if the intake manifold experiences
15psi in one MC engine that uses stock EM and Turbo, and another more
modified MC engine also sees the same pressure at the intake ports, it's
still 15 pounds going into the combustion chamber? After all, if the engines
still have the same set up at that point, (combustion chamber) 15lbs is
15lbs. Am I right? I realize that a better turbo and larger more efficient
manifolds and runners will net you more flow and thus more potential, but
will one engine make more power than the other without internal mods? I need
help understanding this if I am wrong. Thanks for the help.
 quattrorunner at lvcm.com
 Brandon Adams >>