I should have asked these questions before making the change but anyway.....
1) How much does a 65mm s/c pulley increase rpm speed %?
2) Known decrease in s/c life vs stock? Failures?
3) Does the Eurocharged tune allow clutch disengagement for heat as stock tune does?

 

Great questions. It seems to be a hit or miss. I would love to have the extra power on my low mileage SRT-6, but I don't want to jeopardize screwing things up due to a bad email tune. Only 65mm pulley I would consider would be a Code 3 steel (discontinued) or the Poland made steel 65mm on ebay that Red Dog is running.

I believe the 65mm does increase the wear of course on the supercharger due to how much faster it is spinning and generating more heat. I do not know the specifics though.

 

How about someone with a tune and pulley chimes in....like me. The SC pulley only increases the supercharger RPMs, so don't worry about engine RPMs. A 65mm SC pulley will spin the blower around 2K RPM faster. The tune will not affect the electromagnetic clutch engagement. It will change fuel trims, timing, and shift points. Two years and countless passes at the track with an aluminum 65mm pulley and still haven't had any issues. Eurocharged stands behind their products should anything happen and we have been happy customers for it.

 

With the 65mm pulley the SC rpm is 16,420 at an engine speed of 6,000 rpm. With the 74mm pulley it would be 14,430 rpm.

Obviously less at lower engine speeds, the constant for the SC rpm is 2.405 times engine rpm for the 74mm pulley and 2.737 for the 65mm pulley.
Based on the 178mm crank pulley.

The Internal SC bearings will wear more naturally, but as the SC does not run flat out 99.99% of the time the wear factor can probably be discounted for most.

 

I run a 178/70 which yields 15,765. These are performance cars. Obviously there is a tradeoff. Brian Nutter, owner of Wiseco pistons, once told me a performance motor is good for about 30k miles. This is a motor built with aftermarket parts for performance.
For a couple of analogies consuming a dozen alcoholic drinks a week generally shortens one's life as does exposure to sunlight, particularly ultraviolet.
Enjoy life and enjoy your car if performance is something you enjoy, moderation!