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#Installation manual powerdyne automotive products how to
#Installation manual powerdyne automotive products series

The problem is, the moment Ford changed camshafts, exhaust, intake manifolds or anything on that motor, the gauges were now reading differently. The car was a Ford Mustang with a 5.0 Liter motor, and the pulleys were called “6 pound” or “9 pound” pulleys by what the boost gauge showed on this car. Some time ago, a marketing nerd decided it would be a good idea to name supercharger pulleys by the boost you would likely see on the boost gauge on a certain engine in a certain car.

a supercharger spinning too slowly to match its output to engine needs.

a supercharger that is sized too small for the size of the engine it is bolted to.

an engine that has little restriction and is breathing well (this is a GOOD thing) or.

Now that you understand that, we can tell you that a low boost gauge number is either: The HP of this engine has gone up, and the boost gauge will have gone down. Quite the opposite – they have removed restrictions to air flow in their motor, and although the supercharger is producing as much air as it did before, the engine can now use more of it. They call thinking they did something wrong. Sometimes we get a call from an enthusiast who has just added headers, or cams, or a larger intake and now sees his boost gauge is lower than it used to be. Supercharger output MINUS engine consumption = what's left to display on the gauge. In other words: The boost gauge only shows WHAT'S LEFT after the engine consumes what it can. While the supercharger is spinning and making up air, the engine is also running and inhaling, and the boost gauge only shows the remainder. Pressure is caused by a restriction to flow. If using our high-speed bearings and belts, you can stretch this to 48,000 rpm.Ĭlick to Enlarge What the Boost Gauge is really telling you:Ī lot of people believe the boost gauge measures supercharger output. Target 36,000 RPM at the Impeller if you want a long life from your Powerdyne and 40,000 RPM if you want more performance (and more frequent rebuilds). Use our Impeller Speed calculator to select the right size pulley for your application. Within the Powerdyne, because the drive sprocket is spinning at 12,000 RPM, the driven sprocket (and the impeller attached to it) is spinning at 36,000 RPM. If that engine shows 6000 RPM on the tach, the supercharger drive pulley is spinning at twice that, or 12,000 RPM (because the 3" pulley turns 2 xs for each 1x of the 6"crank pulley). They have a 3-to-1 step-up ratio internally from the supercharger drive sprocket to the driven (impeller) sprocket.ĮXAMPLE: A Powerdyne BD Supercharger is equipped with a 3" pulley and mounted on a motor that has a 6" crankshaft pulley.

#Installation manual powerdyne automotive products series

Those BD (Belt Drive) series superchargers like to run the impellers at 36,000 RPM internally, and will accept intermittent peaks of 40,000 RPM. How small of a pulley you can use on your BD-series blower depends on your shift point, whether you have an automatic or a manual transmission, and on the size of your crankshaft pulley. They move more air (CFM) at lower impeller speeds. But, belt-driven superchargers have larger volutes and larger impellers, so they also do not need to spin as fast to be effective. Superchargers with internal drive belts cannot spin as fast as their gear-driven cousins. You can also use this technique on the smaller supercharger drive pulley if you do not have a caliper.Ĭlick to Enlarge Open Bearing and Impeller Speed Calculator When it just touches both sides of the pulley, you can measure the U with a standard ruler and know your crank pulley diameter. If it is too small, open it up with the scissors a little more and try again. Try to slip it over the crank pulley where the belt runs. Cut a large letter "U" out of a piece of stiff paper. See picture below, and click on it to enlarge it.Ī 6" caliper ($20) will do a nice job on the supercharger drive pulley, but the arms are too short to reach around most crankshaft pulleys.Ī simple solution can be made with paper and a scissors.

not the outer edges of the pulley where the lips are high to keep the belt from walking off. Measure the diameter of the pulley where the belt runs.

You will need to temporarily remove your supercharger drive belt from the crankshaft to the supercharger to do this.

#Installation manual powerdyne automotive products how to

Supercharger Rebuild Warranty How to measure your pulleys

How can I tell if my supercharger is CW or CCW? Sur-Grip® Anti-Belt-Slip Pulley Treatment Suggested supercharger pulley exchange routine How Speed-Shifting effects the Supercharger What the Boost Gauge is really telling you Selecting Pulleys for a Powerdyne / Cool Charger / B&M / Ford Motorsports / Dinan Supercharger and Pulley Frequently Asked Questions