Sc12 Supercharger Pulley

[Smithius]

Before anyone says use the search button, i have and after a good hour and a half of sifting through endless post i need to get some straight answers if posible.

 

I have jus bought an SC12 supercharger to go on my 4k and i was wondering what pulley everyone is using on the front of the supercharger?

 

My plan is to use the aircon pulley on the front of the crank but i would like to know if there is a simple soultion to the pulley on the supercharger?

 

Can i just use the pulley of a corolla aircon compressor or is something of another model ans easier fit?

 

I am a machinst so i can modify stuff pretty easy but a direct, or nearly, fit would be awsome.

 

Also what sort of boost are you getting out of the setup that you are using?

 

 

Cheers in advance

Matthew

[11TWO]

Here is something... http://www.pulleybros.com.au/

 

Here is an idea of what sort of setup and boosts 4A-GZE owners are running according to twincam.org.

http://www.twincam.info/index.php?showtopic=15515

 

Other than that sorry I'm no use.

[1JZKe55]

hey the easiest way to is too use the standard pulley on the supercharger and turn one up that will bolt up to the harmonic balancer so you can get the right drive ratio

[fatroll 20]

hey guys,

 

Sorry just hijakin dis post abit. I'm also thinkin about putin dis supercharger or da 1 of da 4agze

on 2 a 5k carby or weber any1 done it or herd of it bein done? & what sort of power?

 

cheers Rod

[Falken_KE30]

dee dwon on da 4AGZE is da SC12

 

Dand it dwill give youz elenvity Billion Megawatts of powerzz at da fwont Wheelz

Edited December 18, 2009 by Falken_KE30

[fatroll 20]

dee dwon on da 4AGZE is da SC12

 

Dand it dwill give youz elenvity Billion Megawatts of powerzz at da fwont Wheelz

 

 

OH my bad well wats da biger 1 off da old supras? It will be goin in 2 a ke20

not a front wheel s#$%er :locked:

[seabiscuit]

OH my bad well wats da biger 1 off da old supras? It will be goin in 2 a ke20

not a front wheel s#$%er :locked:

We have rules about "text" speak on this forum. Generally EVERYONE frowns upon it. If you want REAL answers, spell properly. Most of the

know-it-all's on here don't know how to understand text speak and you won't get any answers from them. Instead you will be ignored :n:

[Falken_KE30]

We have rules about "text" speak on this forum. Generally EVERYONE frowns upon it. If you want REAL answers, spell properly. Most of the

know-it-all's on here don't know how to understand text speak and you won't get any answers from them. Instead you will be ignored :cool:

 

what he said :locked:

 

Crappy Day, so Crappy Reply.... need a sarcasm smiley :n:

[1JZKe55]

yes it is possable to set a sc14 as a draw through set up have done it before made about 65rwkw on 7psi max intake temp gets to high to run any more.

With intercooling/efi and 14psi made 106rwkw and 436nm out of this set up :)

[fatroll 20]

hey mate thanks heaps u helped me out heaps

safed me alot of time and for da rest of yous I'm

new so relaxs ay I'm sorry.

[Smithius]

Yeah 1JZKE55 i was thinking of doing that but the otherway around. I might machine up a v belt pulley to suit the supercharger, I'm pretty sure that a v belt pulley should be sufficient for the amount of boost I'm going to run.

 

I'm not sure if the SC14 is the same but what do the 3 or 4 little vacuum hoses do on the SC12?

 

I havent really looked at it closely but as far as i can tell they do nothing?

 

 

Cheers boys

[1JZKe55]

I'm not sure if the SC14 is the same but what do the 3 or 4 little vacuum hoses do on the SC12?

 

I haven't really looked at it closely but as far as i can tell they do nothing?

 

THEY MUST ALL BE HOOKED UP OR THE SUPERCHARGER WILL SHIT IT'S SELF

 

those 3 or 4 little lines equalize the pressure on the supercharger bearings :P

 

here's some info that might help

 

 

When fitting a supercharger, you should match the swept volume of the supercharger to the size of the engine. If the choice is made carefully, problems from overboosting and the required paraphenalia to solve these problems will be minimised.

The supercharger will also be kept in its safe operating speed with correct selection.

 

To choose a setup you need to know :-

1. Engine capacity

2. Maximum engine speed you will be using.

3. Boost level desired

 

I am setting out the calcs needed for a 1200cc engine in the steps below.

 

FIRST CALCULATION (Engine Litres/min @ 0 Psi )

Multiply engine capacity (in litres) times maximum engine Rpm. E.g. 1.2 litres x 6000 rpm = 7200 litres/minute. Divide this figure by two as engine only fills every second stroke. (7200/2 = 3600 litres/min.

This is the engines air requirements in litres/minute at 0 Psi boost.

 

SECOND CALCULATION (boost ratio)

Add the boost pressure desired (7 Psi) for the engine to 14.7 Psi (atmospheric pressure).

(7 psi boost desired +14.7 =21.7 psi)

Divide this answer by 14.7 and this gives the boost pressure ratio. (21.7/14.7=1.476) This is the boost pressure ratio above atmospheric pressure.

 

THIRD CALCULATION (Actual air requirements @ desired boost)

 

Multiply the boost ratio by the litres/minute obtained for 0 Psi and you get the actual air requirements in Litres/min for the engine at that boost. In our example this is 3600 litres/min X 1.476 = 5313.6 litres/min for 7Psi boost.

 

To decide on the correct size of supercharger you need to know :-

1. The swept volume per revolution of the supercharger. (Eaton M62 1 litre/rev, SC14 from a 1G-GZE 1.5 litres/rev, SC12- 1.2 L/rev)

2. The maximum continuous safe operating speed for the supercharger. (Eaton M62 14000 rpm continuous, Toyota SC14 12000 rpm??)

3. The maximum pressure that can be safely produced by the supercharger continuously. (Eaton M62 12 psi, SC14 10-12Psi??? teflon on rotors melts??)

 

CALCULATION (Supercharger rotor speed)

Divide the desired air flow (5313.6 L/min) by the swept volume of the supercharger (SC14 from the 1G-GZE is 1.5 litres per revolution). This will tell you the maximum speed the supercharger rotors must be run at to produce the volume required.

5313.6/1.5 litres = 3542.4 rpm for the SC14.

5313.6/1 litre = 5313.6 rpm Eaton M62

 

CALCULATION (Pulley size ratio)

Divide the rotor Rpm by maximum desired engine rpm to get the drive ratio of the pulleys. For an SC14 on a 1200 @ 7psi boost the desired supercharger pulley ratio is

3542.4 /6000 rpm = 0.5904.

 

EXAMPLE OF CHANGE OF DRIVE RATIO

If the 1200 cc engines supercharger pulley ratio is increased to 0.75 using the 1.5 ltr/rev SC14 charger, the volume of air produced when running to 6000 would be 6000 x 0.75 x 1.5 litres =6750 litres/min

 

Boost produced would be 6750 litres/3600 litres (at 0 boost) =1.875 boost ratio For Psi boost ((1.875 x 14.7) - 14.7)=12.86 Psi.

 

if you want to get even more technical the sc14 is actually 1.42

Edited January 14, 2010 by 1JZKe55

[Smithius]

So all 3 lines should be teed together?

 

If i could have a look at your setup some time a bit closer it would be greatly appreciated

 

 

Cheers

Matthew

[yohan18]

So once you have your ratio do you divide your crank pulley by the pulley size ratio example my pulley is 127mm divide by my ratio of 1.21 equals 104.9mm (127/1.21 = 104.9)

 

Theoretically that means my pulley has to be 105mm on the sc12?