What is the size of JCW SC pulley?

[Alvinjn]

Was wondering what is the size of the JCW supercharger's pulley reduction? Anyone knows if the JCW kit can take a 17% reduction pulley? I've bought the Alta lighten crank pulley with 2% oversize & would like to fit it. Wondering if there will be to much stress on the SC or will it over rev the SC.

Thanks for any information that i can get. My car is already after the official warranty period.

[minigolf]

IIRC it is 13%.

From what I have read I would expect a 17% reduction pulley to be okay on a JCW kit, but I'm not sure where you'd go in regards to software upgrades (if you needed one).

You've paid good money for a JCW kit, why do you want to mod it with aftermarket bits?

[Alvinjn]

Just found it that its like 14.3%. So i'm wondering if its ok to fix a lighten crank pulley with 2 % oversize making it like 16.3%.

Anyone with a 17% pulley? How is the reliability. Wouldnt want to blow the SC.