I need help to figure out what's the right calibration disk/washer dia. to use.

V2 SC with 3.33" pulley. Most people suggest a rising rate 6:1.

http://www.vortechsuperchargers.com/...superfmuim.pdf

From looking at the fuel pressure chart, my best bet looks like the 3.62 disk/washer that's included in my Vortech Super FMU

Here's my math. It sounds about right.

For 3.62 disk @ 10psi of boost. The fuel pressure is at 100 psi. 100psi-35psi(static) = fuel pressure of 65psi. 65psi @ 10 psi boost = 6.5:1 of raising rate?

The same math for the next disk/washer down 2.72 would yield 4.5:1 of raising rate?

Am I right?

 

No one?? afaeawef

 

sorry i suck at math, but i know of people who have left this disc that comes in the fmu and run 10psi without a problem

 

yes , you will be fine with the disc that comes with the kit

 

thanks for all the replies.

 

i thought the way it worked out is that if you get a 4:1 disk, for instance, for ever pound of boost you increase the fuel pressure 4 pounds.

so, with the 4:1 disk, at 10 psi that'd be an additional 40 psi of fuel. if you keep the stock fpr on there the total amount of fuel pressure would then be 83 psi (if the stock fpr had the fuel pressure at 43 psi with no vacuum).

i'm pretty sure this is how it goes and if it is that's why i totally avoid the fmu. they take the fuel pressure increase a bit too overboard in my opinion.