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Expected Power Gain Formula

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Boost Calculations for M52B28 Motor and SC14 Supercharger

Supercharger Boost & Power Calculations

Here I will try to show the calculations and formulas used to get an rough estimation of expected boost from an Supercharger. The Formula can be applied to other setups and superchargers as well,

For this example We will be using the BMW 2800cc M52B28 engine as the basis the amount of boost expected from using the SC14 + 103mm Holden Pulley, To read more about pulley options for the SC14 please go read About the SC14 Supercharger Category.

And please skip to the bottom of the page if all the math below makes you dizzy, I originally modified and used this formula courtesy of the datsun1200 forums.

Note: This has served in conjunction with the FAQ section of the old site since 2015, now that we have our dedicated FAQ Section, its time to retire this as a simple post back on the blog. Last Updated – 4/29/2017

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More About the SC14 Supercharger

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Updated 7/10/2016 – Information Dump & Archival.

Below are Notes of this Supercharger I have gathered from http://mr2.com/TEXT/SuperChargerInfo.html

It was an article supposedly posted on their old site and summarizes what was known in the 1990s. Now in the 2010’s many of this information may or may not be relevant apart from the blower and its nitty gritty specifications, use this as archival purposes and for anyone looking for more information. 🙂

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About the Supercharger (SC14)

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SC14 Supercahrger for BMW Info
Weight: 12kg Displacement: 1460cc Dimensions: 31cm long x 15cm wide x25.5cm tall Max Safe Operation: 12000 rpm Theoretical Discharge cc/rev 1160 – 1460 Maximum RPM Continuous) 11,000 – 10,000 Maximum RPM Instantaneous) 14,000 – 13,000 Maximum Pressure Ratio Continuous 1.8 Maximum Pressure Ratio instantaneous 2.0

The Toyota SC14 is compact heavy roots type positive displacement supercharger which can fit almost any car, it has the ability to spin both ways and still make power, A nifty feature these chargers also incorporate is a magnetic clutch system that when wired to a switch lets you turn it on and off when you desire, turn the supercharger on and off at will – akin to the Mad Max films, Some people wire it to the throttle position sensor, only having it on at full throttle, some also delete the clutch system altogether.

Originally Manufactured by Ogura Clutch, Code Named TX15 and more commonly known as the Toyota SC14 supercharger, many of its smaller and larger variants were used in Volvos, VW, Mitsubishi, Kawasaki Jet Skis, Toyota People Mover Vans, Speed Boats and many more throughout the last two decades. From AMR300, to AMR500, to SC12 and the larger sized SC20 and SC28 (Code Named TX20 & TX28), there are many of these blowers floating around for dime a dozen, and that’s what they are worth, while larger variations are still somewhat new and less readily available, this whole concept takes the SC14 or TX15 into account with possibility of future incorporation of other larger roots type blowers in its family as well as non roots, twin screw type eatons. Although The Roots is less efficient than the Screw Type Eaton’s, the SC14 is still a very robust and inexpensive charger which has displacement of around 1460cc which is relatively larger than the 1000cc Eaton M62 and more similar to Eaton M90’s which have nearly the same displacement at 1500cc. In stock the Supercharger can produce just under 5 PSI of Boost with its 113mm pulley with the option of smaller OEM or Aftermarket Pulleys as those from Pulleybros, Custom machined to make more power.

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