Innovative Supercharger Solutions


Supercharger Bracket 
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Crank bonding (For damaged crankshafts only)
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Cog Kit Install Instructions
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Sphidget Manual
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Cogged drive conversions

12v V1/V2/V3/V9 Cogged drive conversion kit general notes:

  • This conversion kit uses the factory power steering pump pulley. The kit will only work with the flat non-ribbed style pulley. We highly recommend using a Gruven Parts 12v PS pulley. Pulley is not required for non-power steering version of the kit. 
  • To run any cogged drive it is recommended that an upgraded high flow diverter valve or blowoff valve be used.
  • You may need to upgrade your fuel system to use this kit safely. (Depending on how much boost is increased)
  • Cogged drive systems are louder than serpentine systems.
  • This kit is designed to allow for up to 4mm of parallel pulley misalignment at the supercharger. If you already have alignment problems with your serpentine belt system this kit will still work perfectly and automatically correct for misalignment.
  • This kit can be used at all levels of performance. (Some may choose a supercharger pulley that keeps the boost the same for now and later upgrade to a higher boost pulley)


Cogged supercharger pulley selection information

Currently there are 6 supercharger pulley sizes available:
22T, 24T, 28T, 30T, 32T, and 34T. The cogged crankshaft pulley has 56 teeth.

So which pulley is best for your application? That depends on several factors.
First, determine what version supercharger you have now or plan to use with the cog drive kit.
This is important because you need to determine what the max impeller RPM is for the supercharger you plan to use.
Once the max impeller RPM is known, you can calculate which pulley is the most safe to use with your supercharger.
The calculation is: crankshaft pulley tooth count X RPM at shift X Internal supercharger gear ratio / Supercharger pulley tooth count= Impeller RPM at shift.
For example we will use a V1-S and run this calculation below:
56T X 6500RPM X 3.45Ratio / 28T = 44850 Impeller RPM.
The max impeller speed of the Vortech V1-S is 50000 RPM (You can find max impeller RPM and other information about Vortech superchargers on Vortech's website)
44850 RPM is 89.7% of the max impeller RPM allowed on our example. A good rule of thumb is to keep your impeller RPM at 85% of the max. Going over 85% sometimes is ok but it stresses the bearings and impeller and will eventually shorten life between rebuilds. We run our test car at 90% max allowed impeller RPM.

The next consideration is desired PSI. The best way to determine what size pulley you need is to compare it to the pulley you have installed now. The best way to relate PSI between ribbed pulleys and cogged pulleys is to calculate and compare the ratios between the crankshaft pulley and the supercharger pulley.
For example we will use a V1-S with a 2.87 ribbed pulley and run the calculation below.
First we will convert all dimensions to metric. The standard VR6 crankshaft pulley is 140mm in diameter. To find the metric diameter of your supercharger pulley you multiply the inch value by 25.4. So, a 2.87 inch diameter SC pulley is 2.87 X 25.4 = 72.898, rounded it is 72.9mm
The ratio calculation is: crankshaft diameter / supercharger diameter.
For example: 140/72.9 = 1.920. So for every revolution of the crankshaft pulley, the supercharger pulley makes 1.920 revolutions. The ratio is 1.920:1
The way to calculate the ratio for the cogged pulleys is the same except you substitute the tooth count for the diameter in inches.
For example: 56T crankshaft pulley / 28T supercharger pulley yields a ratio of 2:1.
Since 2:1 is the closest to the ratio of the ribbed pulley in the previous example, you would select a 28T supercharger pulley if you wanted to keep the boost the same.
One note about this calculation is that it does not take into account any loss of PSI caused by belt slip. The cogged pulleys do not slip but ribbed pulleys do slip. If you make 8 PSI on a slipping belt, you may make 2 to 5 PSI more with a similar ratio cogged pulley.
The current available cogged supercharger pulleys and estimated PSI ranges are listed below:

V1/V2 Superchargers

22T 20-22 PSI
24T 18-20 PSI
26T 16-18 PSI 
28T 14-16 PSI
30T 12-14 PSI
32T 10-12 PSI
34T  8-10  PSI

V9 Superchargers

22T 10-12 PSI
24T 8-10   PSI