Bearing and Impeller Speed Calculator


Using the Bearing and Impeller Speed Calculator

Input your crankshaft and supercharger pulley diameters and your maximum RPM's into the calculator below. Compensate for speed-shifting if you drive that way (read the paragraph on speed-shifting below).

Select your supercharger from the drop-down list OR input your internal step-up ratio directly if you know it.

Press "Calculate" to see what your impeller RPM's will be. This information will help you select the right pulley size for your bearing life, or to bring your compressor map into line with your engine.

Bearing and Impeller Speed Calculator

(Crank pulley size / Blower pulley size x step up ratio) x max rpm

Crank Pulley Diameter:
Blower Pulley Diameter:
Supercharger Model
Max Engine RPM:
Click this button to calculate the Impeller RPM
Impeller RPM:

Blower Models

Max RPM

Step Up

Paxton Novi 1000,2000,3000 55,000 3.54
Paxton SN series and VR-4 series 40,000 4.44
Powerdyne BD-11,BD-11A,BD-10,BD-600,CoolCharger 38,000 3.05
Powerdyne, 928 Motorsports Super-Powerdyne 46,000 3.05
Powerdyne XB-1a 58,000 3.44
ProCharger P600B  60,000 3.05
ProCharger P-1SC 62,000 4.10
ProCharger P-1SC-1 65,000 4.10
ProCharger P-1SC-2 60,000 4.10
ProCharger D-1  65,000 4.44
ProCharger D-1SC 62,000 4.10
Raptor R 48,000 3.00
Raptor R Hybrid 46,000 3.00
Raptor V, VL 50,000 3.00
Vortech® V-1 A-Trim 45,000 3.45
Vortech® V-1 S-Trim 50,000 3.45
Vortech® V-1 SC-Trim 53,500 3.45
Vortech® V-1 T-Trim 55,000 3.45
Vortech® V-2 SQ E-Trim 65,000 3.62
Vortech® V-2 SQ S-Trim 50,000 3.62
Vortech® V-2 SQ SC-Trim 53,000 3.62
Vortech® V3 52,000 3.45
Vortech® V-4 J-Trim and X-Trim 58,000 3.45
Vortech® V-4 XX-Trim 64,000 3.45
Vortech® V-5 G-Trim 65,000 3.45
Vortech® V-7 YS-Trim 65,000 3.45
Vortech® V-9 F-Trim and G-Trim 65,000 3.45