I have a good amount of experience on this subject, and let me tell you, getting high boost out of a supercharger is a huge pain in the ass. We were able to get about 16 psi or so before the belt started shreading, and constant tensioning was required. The solution is a cogged belt, and an upgraded head unit, however significant modifications are required to pull this off. You would need to move the blower forward, have your head unit worked on (takes about a month + ) and figure out how to rig up a new crank pulley that will support the cogged belt. Another issue is what when your pulley on the head unit is so small then you ahve less room for traction on the pulley. So you have to mess around with the idler pulley to get more of a contact patch.

Anyways, the car was sold before we did these things..

These setups are pretty neat, but it never matches the violence of a high boost turbo setup. They always give you the satisfaction of gross amounts of torque and horsepower.... Supercharger setup is good for traction however .. hah hah

Chris

 

Sorry to hijack this thread with my 99% bullshit hypothesis, Am not understanding how you managed to get the 38880Rpm using 6" Crank and 5" S/C pulleys.

in my little knowledge of equations, here is my result

Determine the circumference of both pulleys

6 x 3.141592654 =18.850
5 x 3.141592654 =15.708

the ratio is 1:1.2 (crank:S/C)

9000rpm x 1.2 = 10800RPM

JUST TELL ME TO F**K OFF guys. I deserve it but the curiosity is killing me

 

Firstly, you don't need to bring Pi into it. 5:6 is 1:1.2. Secondly you are talking the ratio of the crank pulley to the blower pulley, not crank pulley to impellor. There is a gear set in the sc.

So the equation is 9000 X 1.2 x 3.6 (RPM X SC pulley:Crank Pulley X SC gear ratio) and equals 32400 rpm or something like that.

 

Trip, unlike the turbo where there is a rod connecting the turbine wheel to the compressor wheel, the supercharger has a set of gears to increase the compressor wheel speed. The speed is multiplied by 3.61 for the V2 and 3.45 for the rest of the vortech blowers.

So for a 3.8" supercharger pulley at 95000 rpm you get something like this:
(6*3.61*9500)/3.8
= 54150 rpm impeller speed

 

Thanks for explaining guys(honda9krpm, AusS2000).


Keep up the good work