Boost is not all that important, many factors can alter the boost reading, one is where the boost line to the gauge is located (bes place is at the plenum, other could be belt slip.
What you need to look for is % increase in horsepower. Thats what really matters, the efficiency of what you have.
My advice is to take it to a Dyno to see the real increase in HP, from there do your homework to see what can be done to improve the setup, new belt or tensioner pulley?, maybe a smaller pulley, new injectors, larger pump, and a chip tune.
Most people think that BOOST is always= more HP, wrong Boost creates a lot of heat, more precisely, compressing air heats it and that kills performance. You want that compressed air cool. If you ever what to go above a certain boost level say around 9psi, an intercooler is a MUST.
So doing ones "homework" is important, read or ask as much as possible on how Forced Induction works..and what your engine needs to take advantage of it.
An engine is a pump, it needs to breathe and needs to exhale, if you have a balanced intake and exhaust, that helps. Also power creates heat, get rid of it with a better rad, ceramic coated headers..etc. To make more HP you need more fuel..so injectors and fuel pumps might be needed.
Not to say this is what you need or want now, but surely you will look after more HP later.
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Originally Posted by petersonracing Hello all-
I am new here and am new to the Mustang world. I just bought a 1990 LX 5.0 with a Paxton Novi 1000 blower. My question is I am only getting about 4lbs of boost at the maximum and that is at about 5000 rpm. Shouldn't the blower be making more boost at lower rpm's? Any ideas? Can you get a smaller blower pulley and turn it up a little bit?
It is pretty much a stock mass air 1990 motor with the blower and flowmaster exhaust. 5 speed. The injectors are 19lbs. Other than that I am not too familiar with the whole setup. The car is really cherry and drives perfectly. |
Paxton Novi 1000 question 
