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                    Vortech Supercharger Impeller Speeds


After we purchase a supercharger and become addicted to the power, we usually want to increase the
horsepower level.  With superchargers, as long your other supporting hardware is up to par, it's as
simple as a pulley swap.  However, there are several things you need to consider prior to putting on
the smallest pulley you can find.  This page will focus on the Vortech V1 /  V2 S-Trim and SC-Trim
supercharger applications.  Some of the considerations include your engine compression ratio, the
strength of your engine block and components, fuel injector and pump supply, engine management
systems, and bypass valve needs based on boost levels.  Both the V1 /  V2 S-Trim and SC-Trim
superchargers are capable of pushing 20 psi of boost.  To allow your supercharger to live a healthy life,
Vortech recommends a maximum impeller speed of 50,000 RPM for the S-Trim and 53,000 RPM for the
SC-Trim to keep the internal bearings from destructing.  The following formulas will help you decide just
how far to push your combination and the charts below will give you a quick reference.


Calculations for Impeller Speeds:

Impeller Speed (Serpentine Pulley systems)  =

            
Crank Pulley Diameter x Step Up Ratio x Engine RPM at Shift
                                     Supercharger Pulley Diameter


Impeller Speed (Cog Pulley Systems)  =

           
# of Crank Pulley Teeth x Step Up Ratio x Engine RPM at Shift
                                # of Cog Supercharger Pulley Teeth


Step Up Ratios:

V1 Superchargers: 3.45
V2 Superchargers: 3.60
Vortech Supercharger Impeller Speeds
V1 Supercharger (step up ratio 3.45)
Crank Pulley
Supercharger Pulley
5500 RPM
6000 RPM
6.87
3.33
39146
42705
6.87
3.15
41383
45145
6.87
3.12
41781
45579
6.87
3.00
43452
47403
6.87
2.95
44189
48206
6.87
2.85
45739
49897
6.87
2.75
47403
51712
 
Crank Pulley
Supercharger Pulley
5500 RPM
6000 RPM
8
3.33
45585
49729
8
3.15
48190
52571
8
3.12
48653
53076
8
3.00
50600
55200
8
2.95
51457
56135
8
2.85
53263
58105
8
2.75
55200
60218
Vortech Supercharger Impeller Speeds
V2 Supercharger (step up ratio 3.60)
Crank Pulley
Supercharger Pulley
5500 RPM
6000 RPM
6.87
3.33
40848
44562
6.87
3.15
43182
47108
6.87
3.12
43598
47561
6.87
3.00
45342
49464
6.87
2.95
46110
50302
6.87
2.85
47728
52067
6.87
2.75
49464
53960
 
Crank Pulley
Supercharger Pulley
5500 RPM
6000 RPM
8
3.33
47567
51891
8
3.15
50285
54857
8
3.12
50769
55384
8
3.00
52800
57600
8
2.95
53694
58576
8
2.85
55578
60631
8
2.75
57600
62836