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SUPERCHARGER RPM & PULLEY SIZE

 

EQUATION TO DETERMINE THESE DATA

 

For the ones thinking of running with a "stacked" combination of pulleys, mentioned [HERE] in more detail, or simply wants to determine what crank / supercharger pulleys setup are equivalent to each other, and/or how fast their SRT-6 supercharger will be spinning, here is a equation that can be very useful to determine these data.

 

 

FORUMLA: (CD) x (CRPM) = (SD) x (SRPM)

 

In pure English, this means the following:

Crank pulley diameter x Crank pulley RPM = SC diameter x SC RPM

 

 

EXAMPLE 1: RPM OF SUPERCHARGER

 

So, if I have got a 185mm crank pulley, a stock supercharger pulley (74mm), and the engine is running at redline (6,200 rpm in this case as it is raised due to ECU tuning), the Supercharger will be spinning at:

 

185 x 6200 = 74.2 x SRPM

SRPM = 15,458

 

EXAMPLE 2: SC PULLEY EQUAL TO CRANK PULLEY

 

Here is another calculation if you want to see what size a supercharger pulley would equal a 185 mm crank pulley:

 

154.4 x 6200 = SD x 15458

SD = 61.9 mm

 

 

EXAMPLE 3: CRANK PULLEY EQUAL TO SC PULLEY

 

Here is another calculation if you want to know what the crank pulley equivalent of a Code3 65mm SC pulley is:

 

154.4 x 6200 = 65 x SRPM

SRPM = 14,727

 

CD x 6200 = 74.2 x 14727

CD = 176.2 mm

 

 

DATA USEFUL FOR THE EQUATION

 

Supercharger RPM safe max value: 15500 - 16000 rpm

Supercharger RPM max value: 20000 rpm

Engine RPM: 6000 rpm (stock) 6200 rpm (tuned)

Stock Crank Pulley diameter: 154.4 mm

Stock Supercharger Pulley diameter: 74.2 mm

Other: Click [HERE] to see more information on measurements of Supercharger Pulleys for the SRT-6 and [HERE] for measurements on the Crank Pulleys.

 

 

 

CALCULATIONS ALREADY DONE FOR YOU

 

60 mm SC pulley is equivalent to 191.2 mm crank pulley

61 mm SC pulley is equivalent to 188.0 mm crank pulley

62 mm SC pulley is equivalent to 185.0 mm crank pulley

63 mm SC pulley is equivalent to 182.1 mm crank pulley

64 mm SC pulley is equivalent to 179.2 mm crank pulley

65 mm SC pulley is equivalent to 176.5 mm crank pulley

74 mm SC pulley is equivalent to 155.0 mm crank pulley

 

and

 

155 / 74 = (2.10) x 5.800 = 12,180 SC RPM (Factory)

178 / 74 = (2.41) x 6000 = 14,460 SC RPM

181 / 74 = (2.45) x 6000 = 14,700 SC RPM

185 / 74 = (2.50) x 6000 = 15,000 SC RPM

155 / 65 = (2.38) x 6000 = 14,280 SC RPM

178 / 65 = (2.74) x 6000 = 16,440 SC RPM (Stacked)

 

 

 

SOURCES

 

ADD MORE SRT-6 INFO
SUPERCHARGER COMPARISON
TESTING OF SUPERCHARGER IHI S105

Picture above shows a diagram of testing the S105 supercharger. Relation between compression ratio and volume flow. Here you can also determine that the supercharger is not running quicker than 16000 rpm, so be careful not to overspin your superchargers.

Video above: Eurocharged 61.9 mm SRT-6 Supercharger whine testing.

TESTING OF SUPERCHARGER IHI S105

Data table above shows a excel sheet with several data eg. crank and blower (sc) sizes, blower (sc) rpm, overdrive %, blower (sc) rpm at different engine revs. Credits: boostmonkey over at CrossfireForum. Click to enlarge.

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