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By Mike Krehel

Here are the dyno numbers on the Paxton supercharger.  My car has the Real Rod dual exhaust and all dyno runs were made with the side pipes closed and the transmission in 3rd gear (roughly 1:1 gear ratio).  I don't have a baseline run for this car, but we can make the assumption that most Prowlers make about 170 rear wheel horsepower with about 230 ft-lbs of torque.

The following dyno chart shows 3 dyno runs.  The first is dynorun.005 that shows the stock Paxton setup which produces 5 lbs of boost.  The second is dynorun.003.  Boost was increased to 7.5 lbs by removing the air cleaner housing.  The third is dynorun.009.  Boost was increased to 8.5 lbs by also removing the venturi plate at the base of the air filter.  Paxton refers to this as the air intake restrictor.  The intake restrictor also serves to center and stabilize the air filter.


The following dyno chart shows the effects of the timing retard control.  I was told by Paxton that with the timing control full ccw, the timing will not be altered.  I was also told that each click will retard the timing by 2 percent.  Paxton recommends to start out with the control at 11 O'clock and then adjust ccw until detonation is heard.  I never experienced detonation and therefore have been running the car with the control full ccw.  One look at the dyno number below will show that this control robs power, however care should be taken if you are experiencing detonation.  Always use the highest octane gas available.


Remember that the supercharger does not make any additional horsepower increase until about 2500 RPMs.  Also keep in mind that the drive belt is now turning the supercharger, so performance below 2500 RPMs maybe slightly less then a stock Prowler.  It's similar to having the air conditioner on all the time.  The only way to really make the car burn out with the supercharger is by power braking and getting the RPMs over about 3000, even then you will only get a little burn.  Power braking is very tough on the transaxle and the brakes and I am not advocating it, I'm just making an observation.  With this in mind we made the following observations of RPMs v/s boost::

RPMs        Boost (lbs)

2000                       0

3000                       1

4000                       3

5000                       5

6000                       7

6500                       8.5